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• Where should I go with hosting my site: VPS, GAE, another option?

  - by Jonathan Hayward

  My website, http://JonathansCorner.com/, began life before 1994 as www.imsa.edu/~jhayward/ and has been through various iterations and improvements to content, HTML, and the like, but remains a literature site that is from a web administrator's perspective fairly simple and primitive: a fair amount of static HTML and supporting files, a little bit of CGI and URI rewriting, .htaccess files providing Expires: headers and the like. An associated site demoes various CGI scripts that fall under the category of "and other creations"; the site as a whole has the purpose of sharing my creative works, and so far a fairly rudimentary use of Apache functionality, supported by Unix tools to, for instance, update RSS feed and the "starting point" link on the home page, has served that purpose fairly well. I looked around here on web hosting, and found the note on web host reccommendations as a good note for "What are some of people's favorite web hosts overall," but I wanted to ask a more focused question of "What are the best web hosts for criteria XYZ:" I am looking at a VPS so I will have root, be able to install stuff and edit Apache's config files etc., running Gentoo or other Linux, BSD, or the like. I would like a system that is secure enough that the host's vulnerabilities are mostly the ones that come along with what I am trying to do: that is, I won't be trying to administer and secure an ancient Linux like some have complained about at 1and1. I would like good uptime/reliability and competent support staff: if the level 1 help desk is going to tell me to go to "My Computer" on a Linux box, I'd like to be able to get past them. Ideally I would like a site hosted within some place that will have low latency for U.S. visitors in particular. I would like a hosting solution that will be with a stable business, one that will probably be around, and one unlikely to vanish without warning. With those things specified, I would be interested in knowing what are the less expensive options. (I expect that some of the things I've specified will knock out all of the cheapest options, but I'm still interested in price.) With all that stated, I'd like to back up a bit and look at whether I am asking the right question. I am concerned that the above is a very good way of asking, "How can I keep my site in line with the wave of the past?" I am wondering if it might be specifically wiser to look to adapt my site to newer technologies instead of trying to keep it on older technologies. For instance, while I would hardly portray my site as a way to show off the full power of Google App Engine, the main site at least should be a straightforward port if I were to do that. And beyond Google App Engine, my knowledge of cloud solutions is basic. If it is a better and more future-proof solution to port my site to another kind of solution, I would be interested in knowing where those future-proof solutions lie. So I would be interested in wisdom. If the question I asked in detail is still a good question to be asking, what would people suggest? Or if I should seriously consider porting my site to a newer basic option, what should I try there? Any thoughts would be appreciated.

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• Alternative Methods of Sharing Folders in Windows?

  - by Blaenk

  Hey guys. I'm running Windows 7 and as of now I simply share folders as one usually does in Windows. I then have a MacBook with Leopard (Now Snow Leopard) which I use to connect to my computer to mount the shares by going to Finder, then CMD + K and typing smb://BlaenkPC (The name of my PC) into the address box. This consequently connects to my computer and mounts all of the shares. The problem is that sometimes, if for example I close my MacBook (Which makes it go to sleep) or sometimes even without doing that, the connection somehow drops. Sometimes I close the MacBook and upon re-opening it, everything still works; it's random. It still shows the computer as being connected, but it just shows 'loading' indefinitely. If I hit 'eject' with the intention of re-connecting to the computer, it disappears from the sidebar (The Computer Icon) in Finder, but I cannot re-connect. Activity Monitor (or ps aux, whichever) both show hung instances of umount; one for each share that was mounted. I cannot kill these processes with kill or killall (Yes, even with sudo, and sending signal -9). This has happened to me before, and here is another person who has experienced this. My question boils down to this: Is there an alternative method of sharing folders in Windows, that my Mac can read/understand, that is possibly more reliable and preferably just as fast? I usually use the mounted shares to watch television episodes off my computer, or movies, etc. (In other words, I open them in VLC and they automatically stream from my computer). As far as I can tell, this is a problem with the Samba protocol. I have heard of NFS, but I am not sure if I would have to re-format my drives, or what. I don't mind running a service or daemon to allow the sharing of the folders, I just want it to be done and hopefully in a better way than typical Windows shares through Samba. Usually when I encounter this problem, which is often (read: every day), I have no other option but to restart the MacBook. As I stated in the first question I linked to, shutting down and restarting don't work; I have to manually force the shutdown by holding the power button. I have not modified my installation of Mac OS X in any hackish way, so I doubt it's something with the Operating System, but worst come to worst, I might end up reformatting and doing a clean install to see if that fixes anything, as I am at a complete loss as to what may be causing the problem, and no one else seems to have any idea or care, despite there being quite a few people suffering from this problem, as my research has shown. Any pieces of information that can help are extremely appreciated. You don't have to answer every question on here, but maybe even some insight as to why it might not be possible to kill those hung umount instances for example, or why I may not be able to reconnect using samba (Is it something regarding the way the protocol works?). One thing to note is that I have another computer in the home network that doesn't seem to have this problem. However, it is also running Windows 7 (Note though that I am not using the homegroup feature, but the typical windows sharing feature). My only deduction is that the problem is being caused by the way the Mac (Or Samba implementation, whichever) is handling things. Perhaps it is a limitation.

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• Can't re-mount existing RAID10 on Ubuntu

  - by Zoran

  I saw similar questions, but didn't find what solution to my problem. After power-cut, one of RAID10 (4 disks were) appears to be malfunctioning. I make tha array active one, but can not mount it. Always the same error: mount: you must specify the filesystem type So, here is what I have when type mdadm --detail /dev/md0 /dev/md0: Version : 00.90.03 Creation Time : Tue Sep 1 11:00:40 2009 Raid Level : raid10 Array Size : 1465148928 (1397.27 GiB 1500.31 GB) Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Mon Jun 11 09:54:27 2012 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : near=2, far=1 Chunk Size : 64K UUID : 1a02e789:c34377a1:2e29483d:f114274d Events : 0.166 Number Major Minor RaidDevice State 0 8 16 0 active sync /dev/sdb 1 0 0 1 removed 2 8 48 2 active sync /dev/sdd 3 8 64 3 active sync /dev/sde At the /etc/mdadm/mdadm.conf I have by default, scan all partitions (/proc/partitions) for MD superblocks. alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes automatically tag new arrays as belonging to the local system HOMEHOST <system> instruct the monitoring daemon where to send mail alerts MAILADDR root definitions of existing MD arrays ARRAY /dev/md0 level=raid10 num-devices=4 UUID=1a02e789:c34377a1:2e29483d:f114274d ARRAY /dev/md1 level=raid1 num-devices=2 UUID=9b592be7:c6a2052f:2e29483d:f114274d This file was auto-generated... So, my question is, how can I mount md0 array (md1 has been mounted without problem) in order to preserve existing data? One more thing, fdisk -l command gives the following result: Disk /dev/sdb: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x660a6799 Device Boot Start End Blocks Id System /dev/sdb1 * 1 88217 708603021 83 Linux /dev/sdb2 88218 91201 23968980 5 Extended /dev/sdb5 88218 91201 23968948+ 82 Linux swap / Solaris Disk /dev/sdc: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x0008f8ae Device Boot Start End Blocks Id System /dev/sdc1 1 88217 708603021 83 Linux /dev/sdc2 88218 91201 23968980 5 Extended /dev/sdc5 88218 91201 23968948+ 82 Linux swap / Solaris Disk /dev/sdd: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x4be1abdb Device Boot Start End Blocks Id System Disk /dev/sde: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xa4d5632e Device Boot Start End Blocks Id System Disk /dev/sdf: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xdacb141c Device Boot Start End Blocks Id System Disk /dev/sdg: 750.1 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xdacb141c Device Boot Start End Blocks Id System Disk /dev/md1: 750.1 GB, 750156251136 bytes 2 heads, 4 sectors/track, 183143616 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk identifier: 0xdacb141c Device Boot Start End Blocks Id System Warning: ignoring extra data in partition table 5 Warning: ignoring extra data in partition table 5 Warning: ignoring extra data in partition table 5 Warning: invalid flag 0x7b6e of partition table 5 will be corrected by w(rite) Disk /dev/md0: 1500.3 GB, 1500312502272 bytes 255 heads, 63 sectors/track, 182402 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x660a6799 Device Boot Start End Blocks Id System /dev/md0p1 * 1 88217 708603021 83 Linux /dev/md0p2 88218 91201 23968980 5 Extended /dev/md0p5 ? 121767 155317 269488144 20 Unknown And one more thing. When using mdadm --examine command, here ise result: mdadm -v --examine --scan /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sd ARRAY /dev/md1 level=raid1 num-devices=2 UUID=9b592be7:c6a2052f:2e29483d:f114274d devices=/dev/sdf ARRAY /dev/md0 level=raid10 num-devices=4 UUID=1a02e789:c34377a1:2e29483d:f114274d devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde md0 has 3 devices which are active. Can someone instruct me how to solve this issue? If it is possible, I would like not to removing faulty HDD. Please advise

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• How to diagnose computer lockups and freezes?

  - by Scott Mitchell

  I built a desktop computer a couple years back with the following specs: CPU: Intel Core 2 Quad Q9300 Yorkfield 2.5GHz 6 MB L2 Cache LGA 775 95W Quad-Core Processor BX80580Q9300 Motherboard: EVGA 122-CK-NF68-T1 LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard Video Card: Two EVGA 256-P2-N758-TR GeForce 8600GT SCC 256 MB 128-bit GDDR3 PCI Express x16 SLI Supported Video Card PSU: SeaSonic S12 Energy Plus SS-550HT 550W ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply Memory: Two G.SKILL 4 GB (2 x 2 GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ Since its inception, the machine has periodically locked up, the regularity having varied over the years from once a day to once a month. Typically, lockups happen once every few days. By "lockup" I mean my computer just freezes. The screen locks up, I can't move the mouse. Hitting keys on my keyboard that normally turn LEDs on or off on the keyboard (such as Caps Lock) no longer turn the LEDs on or off. If there was music playing at the time of the lockup, noise keeps coming out of the speakers, but it's just the current frequency/note that plays indefinitely. There is no BSOD. When such a lockup occurs I have to do a hard reboot by either turning off the computer or hitting the reset button. I have the most recent version of the NVIDIA hardware drivers, and update them semi-regularly, but that hasn't seemed to help. I am currently using Windows 7 x64, but was previously using Windows Server 2003 x64 and having the same lockup issues. My guess is that it's somehow video driver or motherboard related, but I don't know how to go about diagnosing this problem to narrow down which of the two is the culprit. Additional information re: cooling Regarding cooling... I've not installed any after-market cooling systems aside from two regular fans I scavenged from an older computer. The fan atop the CPU is the one that shipped with it. One of the two scavenged fans I added it located at the bottom tower of the corner, in an attempt to create some airflow from front to back. The second fan is pointed directly at the two video cards. SpeedFan installation and readings Per studiohack's suggestion, I installed SpeedFan, which provided the following temperature readings: GPU: 63C GPU: 65C System: 76C CPU: 64C AUX: 36C Core 0: 78C Core 1: 76C Core 2: 79C Core 3: 79C Update #3: Another Lockup :-( Well, I had another lockup last night. :-( SpeedFan reported the CPU temp at 38 C when it happened, and there was no spike in temperature leading up to the freeze. One thing I notice is that the freeze seems more likely to happen if I am watching a video. In fact, of the last 5 freezes over the past month, 4 of them have been while watching a video on Flickr. Not necessarily the same video, but a video nevertheless. I don't know if this is just coincidence or if it means anything. (As an aside, each night before bedtime my 2 year old daughter sits on my lap and watches some home videos on Flickr and, in the last month, has learned the phrase, "Uh oh, computer broke.") Update #4: MemTest86 and 3DMark06 Test Results: Per suggestions in the comments, I ran the MemTest86 overnight and it cycled through the 8 GB of memory 5 times without error. I also ran the 3DMark06 test without a problem (see my scores at http://3dmark.com/3dm06/15163549). So... what now? :-) Any further suggestions on what to check? Is there some way to get a stack trace or something when the computer locks like that? Resolution I have never did figure out the particular problems, but based on the suggestions here and elsewhere, I'm presuming it was a motherboard issue. In any event, I recently upgraded my system, buying a new motherbeard, PSU, CPU, and RAM, and that new rig has been working splendidly the past several weeks. I am using the same graphic cards as in the old setup, so I think it's safe to reason that they weren't the cause of the problem.

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• Why would VMWare to go defunct? How to recover from/prevent it?

  - by Josh

  I am running VMWare Server 2.0.2 (Build 203138) on a dual core Intel i5 with Ubuntu Server 10.04 LTS system (kernel 2.6.32-22-server #33-Ubuntu SMP). Disk Subsystem is a software RAID5 array. The system has been set up for a little over a week. For the past 5 days I have been running at leat 3 VMs (Linux and a variety of Windows OSes) with no issues whatsoever. But while I was installing Linux onto a new VM, suddenly all VMs became unresponsive, including the one I was installing to. I could not log in to the VMWare Management Interface, and the system was somewhat unresponsive via SSH. When I looked at top, I saw: top - 16:14:51 up 6 days, 1:49, 8 users, load average: 24.29, 24.33 17.54 Tasks: 203 total, 7 running, 195 sleeping, 0 stopped, 1 zombie Cpu(s): 0.2%us, 25.6%sy, 0.0%ni, 74.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8056656k total, 5927580k used, 2129076k free, 20320k buffers Swap: 7811064k total, 240216k used, 7570848k free, 5045884k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 21549 root 39 19 0 0 0 Z 100 0.0 15:02.44 [vmware-vmx] <defunct> 2115 root 20 0 0 0 0 S 1 0.0 170:32.08 [vmware-rtc] 2231 root 21 1 1494m 126m 100m S 1 1.6 892:58.05 /usr/lib/vmware/bin/vmware-vmx -# product=2; 2280 jnet 20 0 19320 1164 800 R 0 0.0 30:04.55 top 12236 root 20 0 833m 41m 34m S 0 0.5 88:34.24 /usr/lib/vmware/bin/vmware-vmx -# product=2; 1 root 20 0 23704 1476 920 S 0 0.0 0:00.80 /sbin/init 2 root 20 0 0 0 0 S 0 0.0 0:00.01 [kthreadd] 3 root RT 0 0 0 0 S 0 0.0 0:00.00 [migration/0] 4 root 20 0 0 0 0 S 0 0.0 0:00.84 [ksoftirqd/0] 5 root RT 0 0 0 0 S 0 0.0 0:00.00 [watchdog/0] 6 root RT 0 0 0 0 S 0 0.0 0:00.00 [migration/1] The VMWare process for the virtual machine I was installing into became a zombie. Yet, it was still consuming 100% of the CPU time on one of the cores, and I couldn't reach it or any other virtual machines. (I was logged in to one virtual machine over SSH, another via X11, and a third via VNC. All three connections died). When I ran ps -ef and similar commands, I found that the defunct vmware-vmx process had it's parent PID set to init (1). I also used lsof -p 21549 and found that the defunct process had no open files. Yet it was using 100% of CPU time... I was unable to kill any vmware-vmx processes, including the defunct one, even with kill -9. As a last resort to resolve the situation I tried to reboot the box, however shutdown, halt, reboot, and init 6 all failed to reboot/shutdown, even when given appropriate --force settings. ControlAltDel produced a message about rebooting on the console, but the system would not reboot. I had to hard power-cycle the box to resolve the situation. (See my other question, Should I worry about the integrity of my linux software RAID5 after a crash or kernel panic?) What would cause a scenario like this? What else could I have done to resolve it besides a hard reboot? What can I do to prevent such a situation in the future?

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• Server Cabinet/Room Cooling

  - by user37226

  Hello all. I currently have two desktops and three servers in my office sitting on the floor (I know this is bad). With that many servers the ambient temperature in the room goes up quickly. I am located in Dallas, TX so during the winter, if the heat is kept low, it is not a problem, but during the summer it easily jumps the room +10 degrees. I have decided and found a free 42U server cabinet that a hosting company was throwing away to house all of these systems in. One server is in a rack mount case while the other four servers are housed in mid-tower cases. I have purchased shelves for each computer and plan to lay the towers side ways on these shelves (as replacing the cases costs a heck of a lot of money). I like the idea of housing all of these systems in the cabinet because it will save a lot of room and clean up all of the cabling currently laying all over the office floor. When putting this setup together over the next couple of weeks, I want to address issues with dust and cooling. The server cabinet has a fan on top, front plexiglass door and a rear metal door with vent wholes on the bottom. First the cooling issues. I know I am going to want to have cool air enter the bottom of the cabinet and exit the top. I do not want the room heating up though as this will make my work area hot and then make the servers warmer as the air eventually reenters the cabinet. I had an idea to fix this problem, but am unsure if it will work. I was thinking of taking flexible piping and adapting it to the back fans of the computer having the other end of the pipe at the top close to the cabinet's top mounted fan. I was then thinking of creating a duct around the top fan into the attic. Now I am very concerned that the attic will cause issues with this type of setup because during July/August time frame, the attic is easily 120 degrees F. I could also use the flexible pipe to take it to an attic exhaust vent if it would be better to vent it into the 100 degree air outside (at least there may be wind. The other option would be to buy a small portable air conditioner. This may be a possibility, but do I want to spend the extra money on power? I bet this increases the noise. Plus they are around $250 on Amazon. What would you all recommend? Depending on the solution I end up running with above, I would also like to limit the dust that gets into the cabinet. If I were to cut a whole and mount a second cabinet fan on the bottom of the rear door, could I possibly mount a standard home air filter on the other side of that whole? Thanks in advance for your recommendations. I look forward to reading your interesting ideas.

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• Server Cabinet/Room Cooling

  - by user37226

  Hello all. I currently have two desktops and three servers in my office sitting on the floor (I know this is bad). With that many servers the ambient temperature in the room goes up quickly. I am located in Dallas, TX so during the winter, if the heat is kept low, it is not a problem, but during the summer it easily jumps the room +10 degrees. I have decided and found a free 42U server cabinet that a hosting company was throwing away to house all of these systems in. One server is in a rack mount case while the other four servers are housed in mid-tower cases. I have purchased shelves for each computer and plan to lay the towers side ways on these shelves (as replacing the cases costs a heck of a lot of money). I like the idea of housing all of these systems in the cabinet because it will save a lot of room and clean up all of the cabling currently laying all over the office floor. When putting this setup together over the next couple of weeks, I want to address issues with dust and cooling. The server cabinet has a fan on top, front plexiglass door and a rear metal door with vent wholes on the bottom. First the cooling issues. I know I am going to want to have cool air enter the bottom of the cabinet and exit the top. I do not want the room heating up though as this will make my work area hot and then make the servers warmer as the air eventually reenters the cabinet. I had an idea to fix this problem, but am unsure if it will work. I was thinking of taking flexible piping and adapting it to the back fans of the computer having the other end of the pipe at the top close to the cabinet's top mounted fan. I was then thinking of creating a duct around the top fan into the attic. Now I am very concerned that the attic will cause issues with this type of setup because during July/August time frame, the attic is easily 120 degrees F. I could also use the flexible pipe to take it to an attic exhaust vent if it would be better to vent it into the 100 degree air outside (at least there may be wind. The other option would be to buy a small portable air conditioner. This may be a possibility, but do I want to spend the extra money on power? I bet this increases the noise. Plus they are around $250 on Amazon. What would you all recommend? Depending on the solution I end up running with above, I would also like to limit the dust that gets into the cabinet. If I were to cut a whole and mount a second cabinet fan on the bottom of the rear door, could I possibly mount a standard home air filter on the other side of that whole? Thanks in advance for your recommendations. I look forward to reading your interesting ideas.

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• Various problems with software raid1 array built with Samsung 840 Pro SSDs

  - by Andy B

  I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: Serious write speed problems: root [~]# time dd if=arch.tar.gz of=test4 bs=2M oflag=sync 146+1 records in 146+1 records out 307191761 bytes (307 MB) copied, 23.6788 s, 13.0 MB/s real 0m23.680s user 0m0.000s sys 0m0.932s When doing the above (or any other larger copy) the load spikes to unbelievable values (even over 100) going up from ~ 1. When doing the above I've also noticed very weird iostat results: Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 1589.50 0.00 54.00 0.00 13148.00 243.48 0.60 11.17 0.46 2.50 sdb 0.00 1627.50 0.00 16.50 0.00 9524.00 577.21 144.25 1439.33 60.61 100.00 md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 0.00 1602.00 0.00 12816.00 8.00 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 And it keeps it this way until it actually writes the file to the device (out from swap/cache/memory). The problem is that the second SSD in the array has svctm and await roughly 100 times larger than the second. For some reason the wear is different between the 2 members of the array root [~]# smartctl --attributes /dev/sda | grep -i wear 177 Wear_Leveling_Count 0x0013 094% 094 000 Pre-fail Always - 180 root [~]# smartctl --attributes /dev/sdb | grep -i wear 177 Wear_Leveling_Count 0x0013 070% 070 000 Pre-fail Always - 1005 The first SSD has a wear of 6% while the second SSD has a wear of 30%!! It's like the second SSD in the array works at least 5 times as hard as the first one as proven by the first iteration of iostat (the averages since reboot): Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 10.44 51.06 790.39 125.41 8803.98 1633.11 11.40 0.33 0.37 0.06 5.64 sdb 9.53 58.35 322.37 118.11 4835.59 1633.11 14.69 0.33 0.76 0.29 12.97 md1 0.00 0.00 1.88 1.33 15.07 10.68 8.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 1109.02 173.12 10881.59 1620.39 9.75 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.41 0.01 3.10 0.02 7.42 0.00 0.00 0.00 0.00 What I've tried: I've updated the firmware to DXM05B0Q (following reports of dramatic improvements for 840Ps after this update). I have looked for "hard resetting link" in dmesg to check for cable/backplane issues but nothing. I have checked the alignment and I believe they are aligned correctly (1MB boundary, listing below) I have checked /proc/mdstat and the array is Optimal (second listing below). root [~]# fdisk -ul /dev/sda Disk /dev/sda: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00026d59 Device Boot Start End Blocks Id System /dev/sda1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sda2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sda3 4605952 814106623 404750336 fd Linux raid autodetect root [~]# fdisk -ul /dev/sdb Disk /dev/sdb: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0003dede Device Boot Start End Blocks Id System /dev/sdb1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sdb2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sdb3 4605952 814106623 404750336 fd Linux raid autodetect /proc/mdstat root # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb2[1] sda2[0] 204736 blocks super 1.0 [2/2] [UU] md2 : active raid1 sdb3[1] sda3[0] 404750144 blocks super 1.0 [2/2] [UU] md1 : active raid1 sdb1[1] sda1[0] 2096064 blocks super 1.1 [2/2] [UU] unused devices: Running a read test with hdparm root [~]# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 664 MB in 3.00 seconds = 221.33 MB/sec root [~]# hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 288 MB in 3.01 seconds = 95.77 MB/sec But look what happens if I add --direct root [~]# hdparm --direct -t /dev/sda /dev/sda: Timing O_DIRECT disk reads: 788 MB in 3.01 seconds = 262.08 MB/sec root [~]# hdparm --direct -t /dev/sdb /dev/sdb: Timing O_DIRECT disk reads: 534 MB in 3.02 seconds = 176.90 MB/sec Both tests increase but /dev/sdb doubles while /dev/sda increases maybe 20%. I just don't know what to make of this. As suggested by Mr. Wagner I've done another read test with dd this time and it confirms the hdparm test: root [/home2]# dd if=/dev/sda of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 38.0855 s, 282 MB/s root [/home2]# dd if=/dev/sdb of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 115.24 s, 93.2 MB/s So sda is 3 times faster than sdb. Or maybe sdb is doing also something else besides what sda does. Is there some way to find out if sdb is doing more than what sda does? UPDATE Again, as suggested by Mr. Wagner, I have swapped the 2 SSDs. And as he thought it would happen, the problem moved from sdb to sda. So I guess I'll RMA one of the SSDs. I wonder if the cage might be problematic. What is wrong with this array? Please help!

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• Hardware recommendations / parts list for a modern, quiet ZFS NAS box - 2011-Feb edition [closed]

  - by dandv

  I want to build some really reliable storage for my data, and it seems that ZFS is the only filesystem at the moment that does live checksumming. That rules out DroboPro, so I'm looking to building a quiet ZFS NAS that would start with 4 2TB or larger hard drives. I'd like this system to be very reliable and relatively future-proof for 2-3 years, so I'm willing to invest some $$$ and buy higher end components. I did see questions here and on other forums about low-cost servers, but I'm not looking for those. I'd be super happy to go for an off-the-shelf solution, but I haven't found one that's quiet. I started doing the research (summarized on my wiki), but I realized that it just gets too complicated for what I know as a software dude, and I'm entering the analysis paralysis area. At this point, I'm basically looking for a parts list for a configuration that will work (and is modern), and I know there are folks around here who are way more competent than me. I've built computers and am comfortable assembling one and messing with *nix; I can follow guides; I just want to end the decision process for the hardware and software configuration. What I've researched so far (not that these are very modern components): Case: I think I've settled on the Antec Twelve Hundred case because it cools well, is quiet, and simply has 12 bays that allow elastic mounting. The SilverStone Raven is its counter-candidate, but I find its construction quite odd. For the PSU, I'm torn between Antec CP-850 and Nexus RX-8500, but I did this research more than a year ago. The Nexus has a very uniform power profile, and I'd rather not have the Antec spin up and down based on load. On the other hand, I'm not sure how often my file server will draw more than 400W under use. For the hard drives, I've read that WD Black drives are actually WD RE3 with a software setting changed. I'd also like to buy different drive types, not just 4 WDs. Recommendations? Right now I have a 2TB Hitachi Deskstar 7K300. For the motherboard, CPU and RAM I have no idea, other than the RAM must be ECC. I already asked a question here about ECC RAM, but I was misguided and was looking for a motherboard that would support USB 3.0 as well. I've learned to go with eSATA, or worry about USB later. Then there's the (liquid) cooling, Wi-Fi card, and FreeBSD vs. OpenSolaris Express. Lastly, I'm wondering if I can make this PC into a media server by adding a Blu-ray drive and a good sound card. But support for Blu-Ray is spotty on Linux, and I don't know if Windows 7 on VirtualBox would get sufficient hardware access to output HDMI or SPDIFF signals. (Running OpenSolaris virtualized is not an option because of the reliability risk.) Then there are HDCP concerns. Suggestions on that would be appreciated as well, but I don't want us to get sidetracked. A specific shopping list on the core components would be great, so I can start ordering, and in the meantime educate myself with regards to the other issues. Finally, I think this could become a great FAQ for those technically inclined to build their own ZFS server, but confused by the dizzying array of options out there, and I promise to compile the results and share my experience building and benchmarking the server.

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• Sporadic disk clicking sound

  - by Abdó

  Hi, I'm having some unusual and sporadic hard disk clicking issues. Here is a cronological description of the facts. I'm using an ASUS P6T-SE with Intel Core i7, 6Gb RAM 600W Power supply and ATI4670 graphics, running Ubuntu 10.10. About one month ago my hard disk (SATA II Seagate Barracuda 1Tb 7200 rpm) started making a clicking sound: a sort of loud tic-tac, every second or so, when involved in disk activity. The system was clearly slower than before at disk access, but it was functional and I could not find any signal of trouble on the linux logs. I disconnected the disk and tried an older SATA drive I had around: no problem with it. Then I reconnected the Seagate disk, and the problem was mysteriously gone. Ubuntu booted normally, usual speed, no clicking. A couple of weeks later, the problem reappeared. I tried disconnecting reconnecting (as it somehow solved the problem before) without luck. So, despite it was a rather new drive, I assumed it was a hardware issue, made backups and bought a new drive. The new drive is a SATA II Seagate Barracuda 1.5 Tb 7200 rpm. I installed both drives at the same time, with the intention of transferring my files from on to the other. To my surprise, when I booted the computer with both drives, both started making the clicking sound !! Even worse, I removed the old drive, leaving the unformated new drive connected, and booted from a LiveCD. It kept clicking ! Puzzled by this, I tried both drives on my laptop with a SATA to USB cable. At the moment I connected any of them, they made one or two unusual clicks and immediately stopped doing that and worked normally. The old drive I thought almost dead, was working like a charm as if nothing happened. Then I thought: "ok, it must be the motherboard. Let's try again". So, I reconnected the old drive to the ASUS P6T motherboard (the same cables and SATA port as before), and it worked as if nothing happened ! The problem was gone again. The new 1.5 Tb drive was also working ok: No clicking nor slowdown. So I left the old 1Tb disk connected and kept using the computer daily during 3 weeks, until today it happened again. Now I don't really know what to do or check. I'm not even sure if it is a hardware issue any more ! This is rather annoying as it seems it happens with a period of 2 or 3 weeks and I have no means of forcing it to happen. Does anyone have a clue of what can causes this behaviour or have any suggestions of things I should check when it happens again ? What I did today is checking some SMART parameters Error log: smartctl -l error /dev/sda. No errors Short selftest: smartctl -t short /dev/sda. No errors Disk Health check: smartctl -H /dev/sda. passed And here are the vendor specific parameters (smartctl -A /dev/sda) Which I'm not quite sure how to interpret. === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 120 099 006 Pre-fail Always - 235962588 3 Spin_Up_Time 0x0003 095 095 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 187 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0 7 Seek_Error_Rate 0x000f 072 060 030 Pre-fail Always - 16348045 9 Power_On_Hours 0x0032 096 096 000 Old_age Always - 3590 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 94 183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0 184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 188 Command_Timeout 0x0032 100 097 000 Old_age Always - 4295164029 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 190 Airflow_Temperature_Cel 0x0022 070 057 045 Old_age Always - 30 (Lifetime Min/Max 19/31) 194 Temperature_Celsius 0x0022 030 043 000 Old_age Always - 30 (0 18 0 0) 195 Hardware_ECC_Recovered 0x001a 037 026 000 Old_age Always - 235962588 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 73950746906346 241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 1832967731 242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 3294986902 Any clue to this mystery will be really welcome. Thank you very much !!

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• Why does my computer run slowly and freeze sometimes?

  - by Brae

  EDIT I disabled sound in the BIOS, rebooted and it hung. I removed the (previously) faulty HDD, rebooted and it hung. I have managed to get my Realtek audio manager open again after its mysterious disappearance. Subsequently my microphone is now working again, to fix it I had to uninstall audio drivers, disable audio in BIOS, install audio drivers, enable audio in BIOS. Access via network (with faulty HDD in) seems to not be triggering hangs at the moment. I think with the sound problem fixed it might play a little nicer, but I think its still going to hang. If it does, then I'm fairly sure its been narrowed down to the mobo. EDIT Pretty convinced my motherboard is the culprit, because nothing else seems to have any obvious problems (bar the hard drive, which the PC still hangs without it being plugged in) So thank you all for helping, once I get more rep ill up a few of the answers. My PC is doing some weird things... Sometimes when I open up a program, lets say Adobe Photoshop, it will load everything normally, nice and quick no problems and I can use it fine. Other times its a little odd, and it loads the program as if it's only using half of the CPU. It's pretty obvious when it does it, normally the loading screen skims past, but when it does this weird load you see it slowly tick though each thing, and the program itself becomes incredibly slow. Even Google Chrome does it sometimes. Yet when I exit and reopen the program without doing anything else, it typically opens fine without lagging. I think this problem is probably a symptom of something bigger, because of other problems I'm having. Random hangs; no matter what I have open or what I'm doing. My PC will sort of freeze up for a few seconds. If music is playing it will either loop the last second or two, or it will buzz. This only lasts for a few seconds then it returns to normal without having to restart. During this time all programs lock up and freeze, and the mouse and keyboard are useless. I am also having a weird issue with my audio jacks, without touching my PC at all, sometimes I will see a popup saying that I have unplugged something or plugged something in, neither of which has actually happened. Pretty sure this is cause by the motherboard. I recently had a 'Pink Screen of Death' (yes pink) which pointed to my audio drivers. The lockups seem to happen with some consistency when someone is accessing my shared files via my home LAN. Which leads me to believe either one of my hard drives is acting up or more likely the controller. One of my drives had a bit of a crash before, I used Spinrite and managed to recover my stuff and now the drive appears to be working okay. This is possibly adding to the problems. My best guess is something has gone wrong with my motherboard, possibly a power issue or a chip has died, I really don't know. So what I would like to know is: Have I have missed some obvious diagnostic to help figure out what it is, or should I just bite the bullet and assume its my motherboard acting up and buy a new system? dxdiag[64-bit] - http://pastebin.com/G30kb2TL PSOD (minidump) - http://pastebin.com/aZsv0H56 HWiNFO64 (system info / specs) - http://pastebin.com/X6h3K8g6

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• Computer not POSTing "randomly"?

  - by smoth190

  I have a custom built PC that is exhibiting some...odd... behavior, something I've never seen before. It was working fine one day, and the next day, it wouldn't start. Seeing as I wanted an upgrade anyway, I purchased a new motherboard that was compatible with all my parts. While replacing the motherboard, I accidentally damaged the CPU. Well, I wanted a new one anyway... so I got a new one. Seeing as I was replacing a ton of parts already, I bought a new PSU because the old one was super loud. When I slapped it all together, it starts up, lights, fans, drives, they all start. But I get no display from the monitor. No beeps, which I believe means it doesn't POST. I figured it was the RAM, because after removing the sound card and graphics card, there was nothing else that I hadn't replaced. When I remove both sticks of RAM, I get a continuous beeping, and according to the mobo handbook, means no RAM. So I think the mobo is functional, or atleast partly. I bought new RAM, but it still didn't work. I tried 3 monitors, with both VGA and DIV. So it's probably not the monitor, either. Now, let me get to the random part. Every 20 or so boots (I should also mention, for about 3 out of 5 boots I have to unplug the PC because it won't powerdown via the button), it will POST and I'll get display. Then, after about 2 or 3 resets, it won't work again. This confuses me so much, because even when I change nothing, it will/will not work. My thought is that maybe it has something to do with the RAM not clearing or something. I also reset the CMOS battery, incase that had anything to do with it, but no eval. I found some weird suggestion online about holding the power button for 30 seconds while it was unplugged. That did nothing, but I didn't expect it would... I've replaced just about the entire computer, and all the parts are compatible. Done about everything I can think of, but nothing has worked. Hopefully someone can help me here. And as I side note: When I do get my computer to boot, it says my hardware has changed and I have to re-activate windows. But it says I have to call Microsoft to do it. So I get this fancy automated voice that asks me to enter in a code into windows, then it asks me "How many computers have you activated with this copy of Windows?". Well, I had it on my computer before I replaced everything, so I said 1. Then he yelled at me for violating my 1-use license. I dunno what's going on there, do I have to re-purchase Windows 7? And they wonder why people pirate software... That's just a bonus question, though. Specs: 8GB of DDR2 RAM (Corsair) AMD CPU (I don't know what GHz or model because I can't find the box... (I think its 4 cores of 2.8Ghz) ASRock A785GM-LE Motherboard

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• Windows 7 ipv4 autoconfiguration - cannot connect to internet

  - by GuiccoPiano

  I get my internet connection from a guy (lets call him my service provider henceforth). He gives internet connections to many students here in my hostel. My PC gets a private IP through his DHCP server. Now, when I switch on my WiFi, my PC gets a private IP as it should and I can connect to the internet just fine. But now when I connect my LAN cable, my PC gets some "Autoconfiguration IPv4 address" 169.254.110.154(Preferred) and I cannot connect to the internet. Here is the ipconfig /all output for ethernet port: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Marvell Yukon 88E8059 PCI-E Gigabit Ethernet Controller Physical Address. . . . . . . . . : <<MAC DISPLAYED HERE>> DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::5054:a347:7d06:6e9a%11(Preferred) Autoconfiguration IPv4 Address. . : 169.254.110.154(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DHCPv6 IAID . . . . . . . . . . . : 285222078 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-50-AC-68-54-42-49-EE-52-16 DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled I also tried: Start a command prompt as admin. Run "netsh winsock reset" Run "netsh interface ipv4 reset" Run "netsh interface ipv6 reset" Restart your computer. All this does not work. Any idea to solve the problem?

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• Windows 7 is stuck at "Starting Windows" when I attempt to boot computer

  - by Eli

  Basically, whenever I turn on my computer, it gets to the Starting Windows phase and just stays there. The startup animation still plays, yet it gets nowhere. I have tried booting into safe mode, however it gets stuck at loading CLASSPNP.SYS. It then freezes there and doesn't continue booting. I have tried booting into recovery mode from the hard drive, and it freezes after displaying the background image. I have tried booting from a recovery CD, which works, and I was able to use system restore. However, using system restore did not fix it, and it still is stuck at the Starting Windows screen. I have tried booting a Windows CD (Windows 8 Retail Installer) to see if I could upgrade it to fix this issue, however that froze at a blank screen after it got past the boot logo. I have tried changing around the BIOS settings (including resetting), to no avail. I have tried re-plugging the internal PSU cables (this is a custom-built desktop), yet this has changed nothing. I can boot into a loopback Ubuntu install on the same drive, which works fine, other than the fact that it has issues with some of the USB ports and the network card. This system has worked fine for the past few months, completely stable, and nothing in the configuration has changed before this error started happening. Startup Repair on the Windows recovery CD doesn't find any issues. Unplugging my secondary hard drive or swapping around memory doesn't change anything. The hard drive itself is fine, it hasn't shown any signs of failure and once again, boots my other OS fine. If anyone could help with this, that would be great. I can't seem to find any possible solution to this. If it makes any difference, my system specs are as follows: AMD FX-8320 Gigabyte GA-970A-D3 4GB of DDR3 Radeon HD 6870 550w PSU I'd like to not have to reinstall Windows, for I have more than a terabyte of data that I would have to back up if that becomes the only option. EDIT: I have since tried the following: Tried the solution involving restoring files from RegBackup, which changed nothing. Tried testing everything with Hiren's boot CD, everything comes back as fine. Tried disabling everything unnecessary in the BIOS and unplugging everything unneeded, it still hangs. Tried swapping out every possible combination of RAM, it still has the same result. The RAM is not at fault it seems Tried every GPU I own (which is many!) and it still hangs at the exact same place. Tried minimizing the power consumption as much as possible, even using an old PCI graphics card. It still hangs at the same place in the same way, signifying that it's not the PSU at fault. Tried resetting the BIOS again, still nothing. Tried every possible combination of BIOS options, even downclocking everything, it still hangs in the same spot. Tried upgrading the BIOS from version FB to FD, which changed nothing. Based on this, I would conclude the motherboard to be at fault. Are there any other possibilities? I don't want to spend $150 for a new motherboard. EDIT 2: This is what it gets stuck at when I try to boot into safe mode: Note the slight graphical corruption at the top of the screen. No matter how I set up the system, this seems to be there. In addition, either it has stopped booting into safe mode now, or it takes upwards of 2+ hours, and I haven't left it running for that long.

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• mySQL Optimization Suggestions

  - by Brian Schroeter

  I'm trying to optimize our mySQL configuration for our large Magento website. The reason I believe that mySQL needs to be configured further is because New Relic has shown that our SELECT queries are taking a long time (20,000+ ms) in some categories. I ran MySQLTuner 1.3.0 and got the following results... (Disclaimer: I restarted mySQL earlier after tweaking some settings, and so the results here may not be 100% accurate): >> MySQLTuner 1.3.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering [OK] Currently running supported MySQL version 5.5.37-35.0 [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MRG_MYISAM [--] Data in MyISAM tables: 7G (Tables: 332) [--] Data in InnoDB tables: 213G (Tables: 8714) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [--] Data in MEMORY tables: 0B (Tables: 353) [!!] Total fragmented tables: 5492 -------- Security Recommendations ------------------------------------------- [!!] User '@host5.server1.autopartsnetwork.com' has no password set. [!!] User '@localhost' has no password set. [!!] User 'root@%' has no password set. -------- Performance Metrics ------------------------------------------------- [--] Up for: 5h 3m 4s (5M q [317.443 qps], 42K conn, TX: 18B, RX: 2B) [--] Reads / Writes: 95% / 5% [--] Total buffers: 35.5G global + 184.5M per thread (1024 max threads) [!!] Maximum possible memory usage: 220.0G (174% of installed RAM) [OK] Slow queries: 0% (6K/5M) [OK] Highest usage of available connections: 5% (61/1024) [OK] Key buffer size / total MyISAM indexes: 512.0M/3.1G [OK] Key buffer hit rate: 100.0% (102M cached / 45K reads) [OK] Query cache efficiency: 66.9% (3M cached / 5M selects) [!!] Query cache prunes per day: 3486361 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 812K sorts) [!!] Joins performed without indexes: 1328 [OK] Temporary tables created on disk: 11% (126K on disk / 1M total) [OK] Thread cache hit rate: 99% (61 created / 42K connections) [!!] Table cache hit rate: 19% (9K open / 49K opened) [OK] Open file limit used: 2% (712/25K) [OK] Table locks acquired immediately: 100% (5M immediate / 5M locks) [!!] InnoDB buffer pool / data size: 32.0G/213.4G [OK] InnoDB log waits: 0 -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Reduce your overall MySQL memory footprint for system stability Enable the slow query log to troubleshoot bad queries Increasing the query_cache size over 128M may reduce performance Adjust your join queries to always utilize indexes Increase table_cache gradually to avoid file descriptor limits Read this before increasing table_cache over 64: http://bit.ly/1mi7c4C Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 512M) [see warning above] join_buffer_size (> 128.0M, or always use indexes with joins) table_cache (> 12288) innodb_buffer_pool_size (>= 213G) My my.cnf configuration is as follows... [client] port = 3306 [mysqld_safe] nice = 0 [mysqld] tmpdir = /var/lib/mysql/tmp user = mysql port = 3306 skip-external-locking character-set-server = utf8 collation-server = utf8_general_ci event_scheduler = 0 key_buffer = 512M max_allowed_packet = 64M thread_stack = 512K thread_cache_size = 512 sort_buffer_size = 24M read_buffer_size = 8M read_rnd_buffer_size = 24M join_buffer_size = 128M # for some nightly processes client sessions set the join buffer to 8 GB auto-increment-increment = 1 auto-increment-offset = 1 myisam-recover = BACKUP max_connections = 1024 # max connect errors artificially high to support behaviors of NetScaler monitors max_connect_errors = 999999 concurrent_insert = 2 connect_timeout = 5 wait_timeout = 180 net_read_timeout = 120 net_write_timeout = 120 back_log = 128 # this table_open_cache might be too low because of MySQL bugs #16244691 and #65384) table_open_cache = 12288 tmp_table_size = 512M max_heap_table_size = 512M bulk_insert_buffer_size = 512M open-files-limit = 8192 open-files = 1024 query_cache_type = 1 # large query limit supports SOAP and REST API integrations query_cache_limit = 4M # larger than 512 MB query cache size is problematic; this is typically ~60% full query_cache_size = 512M # set to true on read slaves read_only = false slow_query_log_file = /var/log/mysql/slow.log slow_query_log = 0 long_query_time = 0.2 expire_logs_days = 10 max_binlog_size = 1024M binlog_cache_size = 32K sync_binlog = 0 # SSD RAID10 technically has a write capacity of 10000 IOPS innodb_io_capacity = 400 innodb_file_per_table innodb_table_locks = true innodb_lock_wait_timeout = 30 # These servers have 80 CPU threads; match 1:1 innodb_thread_concurrency = 48 innodb_commit_concurrency = 2 innodb_support_xa = true innodb_buffer_pool_size = 32G innodb_file_per_table innodb_flush_log_at_trx_commit = 1 innodb_log_buffer_size = 2G skip-federated [mysqldump] quick quote-names single-transaction max_allowed_packet = 64M I have a monster of a server here to power our site because our catalog is very large (300,000 simple SKUs), and I'm just wondering if I'm missing anything that I can configure further. :-) Thanks!

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• My 3D Games crashing in these scenarios

  - by desaivv

  I have a situation here which I am unable to solve. I bought a PC last year March, here are my specs: Intel Core i3 550 @ 3GHz 4 GB RAM @400 MHz XFX GeForce 9500 GT graphics card 1GB @550MHz 500 GB HDD Lately as soon as I load my save game of Skyrim, it crashes. I have been playing Skyrim since I joined Gaming.SE site. Crashes as in the entire scene gets red lines. I can not ALT + TAB back or even CTRL + ALT + DEL either. My only recourse is a hard reset via the power button. Can not take a screen shot either. I have the latest Forceware 296.10 drivers also. This has been happening since the last 2 weeks. I always use Driver Sweeper to clean my old drivers, since that is what XFXForce recommends before installing new drivers. I installed MSI Afterburner lately to see my GPU temperature. My GPU is default, never over-clocked it. In MSI's Afterburner, I can not adjust fan speed. It is greyed out. Also in settings there is no fan tab. With normal Internet browsing it stays at 51 C. Ran Memtest86 over night with level 11. Took about 13 hours, but no errors in my RAM. I even re-installed my OS, with just the 296 drivers. The fan for the GPU does come on. I can play Diablo 2. I can not get past Warcraft 3's menu selection. There WAS some dust in my machine, but I always try and keep everything clean, since in my home town dust is an issue. Always keep cool my entire PC cabinet. My friend came with his functioning graphics card, we bought our PCs at the same time with exact same specifications. His card did not work either. Same problem with the scene freezing with red lines. I did do my research before posting here. That is how I was able to learn about MSI Afterburner, Driver Sweeper, SpeedFan etc. I followed posts on Tom's Hardware too regarding people that had similar problems. One person suggested and was followed by worked as well the suggestion to "Bake the card in an oven". Since I bought it, played Diablo 2 for months, Starcraft 2 campaign for months and Skyrim recently for months. Bought ME3 also. I am at my wits end. I do not know what else to do. I can go out and buy a card, but my friend's card did not work either. I can use the machine for Eclipse or VS2010 development just fine. Just not with 3D gaming. I originally posted this question on Gaming.SE But I was directed here. I have browsed the SU database for my problem and found this, this, and this. But none of these cover my question. My machine is only one year old. Can some experienced superuser(s) shed some light on this scenario? Is it a 3D graphics card problem? Will a brand new card work? What else can I try to pin point the problem? Can it be the Motherboard? Thanks.

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• Most secure way to access my home Linux server while I am on the road? Specialized solution wanted

  - by Ace Paus

  I think many people may be in my situation. I travel on business with a laptop. And I need secure access to files from the office (which in my case is my home). The short version of my question: How can I make SSH/SFTP really secure when only one person needs to connect to the server from one laptop? In this situation, what special steps would make it almost impossible for anyone else to get online access to the server? A lot more details: I use Ubuntu Linux on both my laptop (KDE) and my home/office server. Connectivity is not a problem. I can tether to my phone's connection if needed. I need access to a large number of files (around 300 GB). I don't need all of them at once, but I don't know in advance which files I might need. These files contain confidential client info and personal info such as credit card numbers, so they must be secure. Given this, I don't want store all these files on Dropbox or Amazon AWS, or similar. I couldn't justify that cost anyway (Dropbox don't even publish prices for plans above 100 GB, and security is a concern). However, I am willing to spend some money on a proper solution. A VPN service, for example, might be part of the solution? Or other commercial services? I've heard about PogoPlug, but I don't know if there is a similar service that might address my security concerns? I could copy all my files to my laptop because it has the space. But then I have to sync between my home computer and my laptop and I found in the past that I'm not very good about doing this. And if my laptop is lost or stolen, my data would be on it. The laptop drive is an SSD and encryption solutions for SSD drives are not good. Therefore, it seems best to keep all my data on my Linux file server (which is safe at home). Is that a reasonable conclusion, or is anything connected to the Internet such a risk that I should just copy the data to the laptop (and maybe replace the SSD with an HDD, which reduces battery life and performance)? I view the risks of losing a laptop to be higher. I am not an obvious hacking target online. My home broadband is cable Internet, and it seems very reliable. So I want to know the best (reasonable) way to securely access my data (from my laptop) while on the road. I only need to access it from this one computer, although I may connect from either my phone's 3G/4G or via WiFi or some client's broadband, etc. So I won't know in advance which IP address I'll have. I am leaning toward a solution based on SSH and SFTP (or similar). SSH/SFTP would provided about all the functionality I anticipate needing. I would like to use SFTP and Dolphin to browse and download files. I'll use SSH and the terminal for anything else. My Linux file server is set up with OpenSSH. I think I have SSH relatively secured. I'm using Denyhosts too. But I want to go several steps further. I want to get the chances that anyone can get into my server as close to zero as possible while still allowing me to get access from the road. I'm not a sysadmin or programmer or real "superuser". I have to spend most of my time doing other things. I've heard about "port knocking" but I have never used it and I don't know how to implement it (although I'm willing to learn). I have already read a number of articles with titles such as: Top 20 OpenSSH Server Best Security Practices 20 Linux Server Hardening Security Tips Debian Linux Stop SSH User Hacking / Cracking Attacks with DenyHosts Software more... I have not implemented every single thing I've read about. I probably can't do that. But maybe there is something even better I can do in my situation because I only need access from a single laptop. I'm just one user. My server does not need to be accessible to the general public. Given all these facts, I'm hoping I can get some suggestions here that are within my capability to implement and that leverage these facts to create a great deal better security than general purpose suggestions in the articles above.

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• Boot log from remotely managed/hacked iPhone for analysis

  - by user1319903

  in reference to my other post. syslog captured immediately after a hard reset for analysis of foul play. Apr 8, 2012 10:08:36 PM - dataaccessd [53] (Notice): 137860|CoreDAV|Warn |Account "iCloud" couldn't reach the server at p03-contacts.icloud.com: Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline." UserInfo=0xde63920 {NSErrorFailingURLStringKey=https://%[email protected]/159665024/principal/, NSErrorFailingURLKey=https://%[email protected]/ /principal/, NSLocalizedDescription=The Internet connection appears to be offline., NSUnderlyingError=0xde7dc00 "The Internet connection appears to be offline."} Apr 8, 2012 10:08:36 PM - UserEventAgent [12] (Warning): TRACE: connection interrupted Apr 8, 2012 10:08:36 PM - UserEventAgent [12] (Warning): DEBUG: disconnected Apr 8, 2012 10:08:36 PM - UserEventAgent [12] (Warning): TRACE: Canceling Apr 8, 2012 10:08:36 PM - UserEventAgent [12] (Warning): TRACE: connection invalid Apr 8, 2012 10:08:35 PM - kernel [0] (Debug): launchd[82] Builtin profile: container (sandbox) Apr 8, 2012 10:08:35 PM - kernel [0] (Debug): launchd[82] Container: /private/var/mobile/Applications/048D35CA-6427-4EC8-8B76-A194697A7CE9 [69] (sandbox) Apr 8, 2012 10:08:35 PM - wifid [29] (Error): WiFi:[355640915.904103]: Client dataaccessd set type to background application Apr 8, 2012 10:08:35 PM - dataaccessd [53] (Notice): 137860|DA|Warn |Delegate 5ADDBE3B-D5FD-43E1-87D4-C1153733EFAB finished a refresh but it is not registered with the refresh manager Apr 8, 2012 10:08:34 PM - timed [31] (Notice): (Note ) CoreTime: Not setting system time to 04/09/2012 05:08:34 from GPS because time is unchanged Apr 8, 2012 10:08:34 PM - timed [31] (Notice): (Note ) CoreTime: Not setting time zone to America/Los_Angeles from NITZ Apr 8, 2012 10:08:33 PM - kernel [0] (Debug): AppleKeyStore:cp_key_store_action(1) Apr 8, 2012 10:08:33 PM - kernel [0] (Debug): AppleKeyStore:Sending lock change Apr 8, 2012 10:08:32 PM - profiled [20] (Notice): (Note ) profiled: Device unlock notification received Apr 8, 2012 10:08:31 PM - softwareupdated [37] (Notice): 3e828d98 : Cleaning up unused prepared updates Apr 8, 2012 10:08:27 PM - mstreamd [43] (Warning): PSDLog: Can't return photoStreamsPublishStreamID because no Apple Account has Photo Streams enabled Apr 8, 2012 10:08:27 PM - mstreamd [43] (Notice): (Note ) mstreamd: Not listening to push notifications. Apr 8, 2012 10:08:27 PM - mstreamd [43] (Warning): PSDLog: Can't return photoStreamsPublishStreamID because no Apple Account has Photo Streams enabled Apr 8, 2012 10:08:27 PM - mstreamd [43] (Notice): (Note ) mstreamd: Not listening to push notifications. Apr 8, 2012 10:08:27 PM - mstreamd [43] (Notice): (Note ) mstreamd: Retrieved push tokens. Dev: 0, Prod: 0 Apr 8, 2012 10:08:27 PM - mstreamd [43] (Notice): (Note ) mstreamd: Media stream daemon starting... Apr 8, 2012 10:08:26 PM - SpringBoard [15] (Notice): SMSCTServer is available and ready to rock. Apr 8, 2012 10:08:26 PM - SpringBoard [15] (Error): mms: * isMmsConfigured = 1 Apr 8, 2012 10:08:26 PM - MobilePhone [79] (Warning): Connection lost, retrying with key exchange. Apr 8, 2012 10:08:26 PM - MobilePhone [79] (Warning): Connection lost, retrying with key exchange. Apr 8, 2012 10:08:26 PM - MobilePhone [79] (Warning): Connection lost, retrying with key exchange. Apr 8, 2012 10:08:26 PM - MobilePhone [79] (Warning): Connection lost, retrying with key exchange. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): BT: failed to get connectable state with error 111 Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Error): WiFi: Consulting "no-sdio-devices" property. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Error): WiFi: "no-sdio-devices" property not found. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): SMS Plugin initialized. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): Telephony plugin initialized Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): SIMToolkit plugin for SpringBoard initialized. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Error): WiFi: Consulting "no-sdio-devices" property. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Error): WiFi: "no-sdio-devices" property not found. Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): WiFi picker plugin initialized Apr 8, 2012 10:08:25 PM - SpringBoard [15] (Warning): EKAlarmEngine: Region monitoring not available or enabled. Trigger ignored! Apr 8, 2012 10:08:24 PM - kernel [0] (Debug): AppleH4CamIn::setPowerStateGated: 0 Apr 8, 2012 10:08:24 PM - kernel [0] (Debug): AppleH4CamIn::power_off_hardware Apr 8, 2012 10:08:24 PM - SpringBoard [15] (Notice): IOMobileFrameBufferGetMirroringCapability returning -536870201 via kIOMFBConnectMethod_GetMirroringCapability  Apr 8, 2012 10:08:24 PM - aggregated [61] (Warning): PLAggregateState Error: Leaving state unplugged_screen_off even though we are not in it, doing nothing Apr 8, 2012 10:08:24 PM - aggregated [61] (Warning): PLAggregateState Error: Entering state unplugged_screen_on even though we are already in it, doing nothing Apr 8, 2012 10:08:24 PM - wifid [29] (Error): WiFi:[355640904.616440]: Disable WoW requested by "spd" Apr 8, 2012 10:08:24 PM - SpringBoard [15] (Warning): Application windows are expected to have a root view controller at the end of application launch Apr 8, 2012 10:08:23 PM - SpringBoard [15] (Warning): BTM: attaching to BTServer Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_LoadFirmware_gated: fw len=1232920 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_LoadFirmware_gated - firmware checksum: 0x05935019 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::power_on_hardware Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_Init - No set-file loaded for camera channel 0 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_Init - No set-file loaded for camera channel 1 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_InitialSensorDetection - found sensor on chan 0: 0x0145 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_InitialSensorDetection - found sensor on chan 1: 0x7736 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::power_off_hardware Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_LoadSetfile_gated (camChan=0) Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::ISP_LoadSetfile_gated (camChan=1) Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::setPowerStateGated: 1 Apr 8, 2012 10:08:23 PM - kernel [0] (Debug): AppleH4CamIn::power_on_hardware Apr 8, 2012 10:08:23 PM - profiled [20] (Notice): (Note ) profiled: Locking device Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): HighlandParkResourceMgr::AddFirmware() {'cdma', '    '} added to resources Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function PTP Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction all functions registered- we are ready to start usb stack Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::handleUSBCableDisconnect Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): HighlandParkResourceMgr::AddFirmware() {'gsm ', 'nb  '} added to resources Apr 8, 2012 10:08:22 PM - kernel [0] (Debug): HighlandParkResourceMgr::AddFirmware() {'gsm ', 'wb  '} added to resources Apr 8, 2012 10:08:22 PM - MRMLowDiskUEA [12] (Notice): MobileDelete: LowDisk Plugin: start Apr 8, 2012 10:08:22 PM - MRMLowDiskUEA [12] (Notice): kqueue registration successful Apr 8, 2012 10:08:22 PM - mediaserverd [44] (Error): 22:08:22.522867 com.apple.AVConference: /SourceCache/GameKitServices/GameKitServices-344.21/AVConference.subproj/Sources/AVConferenceServer.m:1867: AVConferenceServerStart Apr 8, 2012 10:08:22 PM - CommCenter [18] (Notice): Carrier bundle value for recipient address: 28818773 Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice - Configuration: PTP Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: PTP Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice - Configuration: iPod USB Interface Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: USBAudioControl Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: USBAudioStreaming Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: IapOverUsbHid Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice - Configuration: PTP + Apple Mobile Device Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: PTP Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: AppleUSBMux Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice - Configuration: PTP + Apple Mobile Device + Apple USB Ethernet Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: PTP Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: AppleUSBMux Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice          Interface: AppleUSBEthernet Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): IOAccessoryPortUSB::start Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function USBAudioControl Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): virtual bool AppleUSBDeviceMux::start(IOService*) build: Feb  1 2012 23:16:46 Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): init_waste Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function AppleUSBMux Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function IapOverUsbHid Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function USBAudioStreaming Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleSynopsysOTGDevice::gated_registerFunction Register function AppleUSBEthernet Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleUSBEthernetDevice::start: Host MAC address = 02:(this Mac address does not physically exist) -edit Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): AppleUSBEthernetDevice: Ethernet address  Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): BTServer[66] Builtin profile: BlueTool (sandbox) Apr 8, 2012 10:08:21 PM - kernel [0] (Debug): BTServer[66] Builtin profile: BlueTool (sandbox) Apr 8, 2012 10:08:21 PM - hpfd [50] (Notice): firmware resource loaded { 'cdma' '    ' } Apr 8, 2012 10:08:21 PM - wifid [29] (Error): WiFi:[355640901.282776]: Could not read APPLE80211_IOC_SUPPORTED_CHANNELS err=82 Apr 8, 2012 10:08:21 PM - wifid [29] (Error): WiFi:[355640901.312786]: Client itunesstored is background application Apr 8, 2012 10:08:21 PM - timed [31] (Notice): (Note ) CoreTime: Want active time in 38.24hrs. Need active time in 121.57hrs. Apr 8, 2012 10:08:21 PM - SpringBoard [15] (Notice): MultitouchHID: detection mode: 255-0 (deferring until bootloaded) Apr 8, 2012 10:08:21 PM - CLTM [12] (Error): CLTM: resetting temps: now = 1333948101, last update = -2147483648 Apr 8, 2012 10:08:21 PM - locationd [28] (Error): WiFi:[355640901.852993]: WiFiManager now available Apr 8, 2012 10:08:21 PM - OTACrashCopier [62] (Notice): (Warn ) Failed to read attributes from '/var/mobile/Library/OTALogging/.last_successful_submission_marker' Apr 8, 2012 10:08:21 PM - hpfd [50] (Notice): firmware resource loaded { 'gsm ' 'nb  ' } Apr 8, 2012 10:08:21 PM - hpfd [50] (Notice): firmware resource loaded { 'gsm ' 'wb  ' } Apr 8, 2012 10:08:20 PM - kernel [0] (Debug): AppleBCMWLANCore::initFirmware(): successful initialization Apr 8, 2012 10:08:20 PM - kernel [0] (Debug): AppleBCMWLANCore:initFirmware(): 2496 PropTxStatus feature is not enabled for this platform  Apr 8, 2012 10:08:20 PM - kernel [0] (Debug): AppleBCMWLANCore::initDongle():: creating virtual interface with prefix = ap Apr 8, 2012 10:08:20 PM - kernel [0] (Debug): AppleBCMWLANCore::initDongle(): Core Driver Initialization Time 19.38798583 Apr 8, 2012 10:08:20 PM - kernel [0] (Debug): 000019.281423 hsic-baseband::safetyNet: port is not connected Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 _create_cesm_vault: try to create blob Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 load_activation_records: This is the default record Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 _create_cesm_vault: blob written Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 ping_configd: Not setting host name, it already has one: Pete's iPod  Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 lookup_baseband_info_new: radio not ready: kCTPostponementStatusNotReady Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 load_activation_records: This is the default record Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Error): WiFi: Consulting "no-sdio-devices" property. Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Error): WiFi: "no-sdio-devices" property not found. Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: Original act. state: Activated Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: radio not ready, don't change activation status, wait for notification, status: kCTPostponementStatusNotReady Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: Activation state now is Activated Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Warning): lockdown says the device is: [Activated], state is 3 Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Warning): lockdown says we've previously registered: [1], state is 1 Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 notification_worker: now listening for CT notifications Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 notification_worker: we've registered for notifications, now make sure we didn't miss one... Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 load_activation_records: This is the default record Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: Original act. state: Activated Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: radio not ready, don't change activation status, wait for notification, status: kCTPostponementStatusNotReady Apr 8, 2012 10:08:20 PM - lockdownd [23] (Notice): 3e828d98 determine_activation_state_new: Activation state now is Activated Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Notice): Posting 'com.apple.iokit.hid.displayStatus' notifyState=1 Apr 8, 2012 10:08:20 PM - SpringBoard [15] (Notice): __IOHIDLoadBundles: Loaded 1 HID plugin Apr 8, 2012 10:08:19 PM - wifiFirmwareLoader [30] (Warning): [    18.778 sec] Downloaded firmware, 192512 bytes Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleKeyStore:cp_key_store_action(0) Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleMultitouchN1SPI: downloaded 128 bytes of prox calibration data ("built-in") Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleMultitouchN1SPI: downloaded 1024 bytes of calibration data ("built-in") Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::attachBusGated(): Bus Driver Initialization Time 18.266927958 Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore:attachBusGated(): Starting with MAC Address: 00:f4:b9:2f:d9:8d Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANFirmwareManager::setNVRAMData(): received 778 bytes Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore: Ethernet address 00:f4:b9:2f:d9:8d Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): Loading syscfg. Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleMultitouchN1SPI: downloaded 56264 bytes of firmware data ("0x0084.bin") in 152ms. Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::apple80211_ioctl() Driver not yet initialized, cannot process ioctl Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::apple80211_ioctl() Driver not yet initialized, cannot process ioctl Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AirPort: Enabled AppleBCMWLANCore (link 0, sys 0, user 0) Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::apple80211_ioctl() Driver not yet initialized, cannot process ioctl Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::apple80211_ioctl() Driver not yet initialized, cannot process ioctl Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANBusInterfaceHSIC::loadFirmware(): DL Ver: chip 0x4330, chiprev 0x4 Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): BTServer[66] Builtin profile: BlueTool (sandbox) Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): BCMWLAN Firmware Version: wl0: Dec 22 2011 19:03:58 version 5.95.45 Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::initFirmware(): Firmware supports ap mode; enabling apsta feature (currently enabled) Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::initFirmware(): country code set to XX Apr 8, 2012 10:08:19 PM - configd [14] (Notice): network configuration changed. Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCmdManager::processResponse(): Firmware Error "BCOM Unsupported" on command "WLC_SET_VAR: bus:txglom" (263). Transaction ID 3, length 0 Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::initFirmware(): Glomming not supported on this device: BCOM Unsupported Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::initFirmware: apsta set to 1 Apr 8, 2012 10:08:19 PM - kernel [0] (Debug): AppleBCMWLANCore::handleEventPacket(): WLC_E_FIFO_CREDIT_MAP,length 6 [9 2 5 3 2] Apr 8, 2012 10:08:19 PM - iapd [49] (Error): Timed out trying to acquire capabilities data. Apr 8, 2012 10:08:19 PM - softwareupdated [37] (Notice): 3e828d98 : Cleaning up unused prepared updates Apr 8, 2012 10:08:19 PM - com.apple.misd [63] (Notice): allowing special port forwarding for test fixtures Apr 8, 2012 10:08:19 PM - hpfd [50] (Notice): resource request { 'N94 ', '    ' } Apr 8, 2012 10:08:19 PM - mstreamd [43] (Notice): (Note ) mstreamd: mstreamd starting up. Apr 8, 2012 10:08:18 PM - kernel [0] (Debug): launchd[44] Builtin profile: mediaserverd (sandbox) Apr 8, 2012 10:08:18 PM - kernel [0] (Debug): launchd[49] Builtin profile: iapd (sandbox) Apr 8, 2012 10:08:18 PM - kernel [0] (Debug): launchd[53] Builtin profile: dataaccessd (sandbox) Apr 8, 2012 10:08:18 PM - kernel [0] (Debug): launchd[60] Builtin profile: apsd (sandbox) Apr 8, 2012 10:08:18 PM - kernel [0] (Debug): launchd[66] Builtin profile: BTServer (sandbox) Apr 8, 2012 10:08:18 PM - mDNSResponder [46] (Error): mDNSResponder mDNSResponder-329.10 (Jan 15 2012 19:07:41) starting iOSVers 9 Apr 8, 2012 10:08:18 PM - mDNSResponder [46] (Error): Note: SetDomainSecrets: no keychain support Apr 8, 2012 10:08:18 PM - mDNSResponder [46] (Error): Note: Compiled without SnowLeopard Fine-Grained Power Management support Apr 8, 2012 10:08:18 PM - fseventsd [51] (Critical): event logs in /private/var/.fseventsd out of sync with volume.  destroying old logs. (10083 7 10090) Apr 8, 2012 10:08:18 PM - fseventsd [51] (Critical): log dir: /private/var/.fseventsd getting new uuid: 8778E61A-0283-4067-B7DF-F75D109983D1 Apr 8, 2012 10:08:18 PM - fseventsd [51] (Error): failed to make the directory /.fseventsd (30/Read-only file system) Apr 8, 2012 10:08:18 PM - fseventsd [51] (Critical): could not open < (No such file or directory) Apr 8, 2012 10:08:18 PM - fseventsd [51] (Critical): log dir: /tmp getting new uuid: 3919EB54-A54F-4289-864A-5158A25EF9DA Apr 8, 2012 10:08:18 PM - wifid [29] (Error): WiFi:[355640898.328610]: WiFi Preferences is up to date Apr 8, 2012 10:08:18 PM - mDNSResponder [46] (Error): D2DInitialize succeeded Apr 8, 2012 10:08:18 PM - fairplayd.N94 [52] (Notice): Vroum Apr 8, 2012 10:08:18 PM - wifid [29] (Error): WiFi:[355640898.537219]: WiFiManager starting, version: WiFiManager-260.9 Feb  4 2012 13:25:16 Apr 8, 2012 10:08:18 PM - configd [14] (Error): WiFi:[355640898.539342]: WiFiManager now available Apr 8, 2012 10:08:18 PM - keybagd [39] (Error): 3e828d98 main: System Keybag loaded Apr 8, 2012 10:08:18 PM - wifiFirmwareLoader [30] (Warning): [    18.268 sec] Found AppleBCMWLANBusInterface; downloading FW.. Apr 8, 2012 10:08:18 PM - wifiFirmwareLoader [30] (Warning): Loading "/usr/share/firmware/wifi/4330b2/bcm94330OlympicUNO3.txt", file size = 778 bytes Apr 8, 2012 10:08:18 PM - wifiFirmwareLoader [30] (Warning): [    18.276 sec] Sending NVRAM, 778 bytes Apr 8, 2012 10:08:18 PM - wifiFirmwareLoader [30] (Warning): Loading "/usr/share/firmware/wifi/4330b2/n94.trx", file size = 192512 bytes Apr 8, 2012 10:08:18 PM - wifiFirmwareLoader [30] (Warning): [    18.300 sec] Sending firmware, 192512 bytes Apr 8, 2012 10:08:18 PM - lockdownd [23] (Error): libMobileGestalt copyEthernetMacAddress: got 00:f4:b9:2f:d9:8f from syscfg Apr 8, 2012 10:08:18 PM - mediaserverd [44] (Notice): 2012-04-08 10:08:18.817015 PM [AirTunes] HAL plugin started Apr 8, 2012 10:08:18 PM - lockdownd [23] (Error): libMobileGestalt createCFStringWithCFData: Cannot convert NULL data to string Apr 8, 2012 10:08:18 PM - lockdownd [23] (Error): libMobileGestalt copyBasebandBoardSnum: Could not convert baseband board snum data to string Apr 8, 2012 10:08:18 PM - lockdownd [23] (Error): libMobileGestalt createCFStringWithCFData: Cannot convert NULL data to string Apr 8, 2012 10:08:18 PM - lockdownd [23] (Error): libMobileGestalt copyWirelessBoardSnum: Could not convert wireless board snum data to string Apr 8, 2012 10:08:18 PM - lockdownd [23] (Notice): 3e828d98 lockstart_local: Build= 9B179 Apr 8, 2012 10:08:18 PM - lockdownd [23] (Notice): 3e828d98 _load_product_type: using Raptor Certs Apr 8, 2012 10:08:17 PM - wifiFirmwareLoader [30] (Warning): [    17.590 sec] wlan AppleUSBHSICDevice found Apr 8, 2012 10:08:17 PM - wifiFirmwareLoader [30] (Warning): [    17.590 sec] WLAN Enumeration attempt 0 / 6: Apr 8, 2012 10:08:17 PM - wifiFirmwareLoader [30] (Warning): [    17.591 sec] Waiting for AppleBCMWLANBusInterface to enumerate... Apr 8, 2012 10:08:16 PM - CommCenter [18] (Notice): MMS thread running Apr 8, 2012 10:08:16 PM - CommCenter [18] (Notice): Communications Center Started. Apr 8, 2012 10:08:16 PM - CommCenter [18] (Notice): STOP LOCATION UPDATE Apr 8, 2012 10:08:16 PM - locationd [28] (Error): WiFi:[355640896.704327]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:16 PM - locationd [28] (Error): WiFi:[355640896.705542]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:16 PM - locationd [28] (Error): WiFi:[355640896.706648]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:16 PM - locationd [28] (Error): WiFi:[355640896.707418]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:15 PM - kernel [0] (Debug): bool AppleRGBOUT::power_down_hardware(), RGB_CTRL (0x00000000) clk_down_ready is not set after 60 msecs Apr 8, 2012 10:08:14 PM - lockdownd [23] (Notice): 3e828d98 main: Starting Up Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): IOReturn AppleRGBOUT::set_display_device_gated(uint32_t), 1 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): virtual void AppleRGBOUT::do_power_state_change(): fSoft: 1 fHard: 1 swapBusy: 1  fController: 0 - 1 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): bool AppleRGBOUT::power_up_hardware() Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): set_crc_notification_state 0 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): virtual void AppleRGBOUT::do_power_state_change(): fSoft: 0 fHard: 1 swapBusy: 0  fController: 1 - 0 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): bool AppleRGBOUT::power_down_hardware() Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): IOReturn IOMobileFramebufferUserClient::set_hotplug_notify(void *, void *) 0x314b3f0d 0xe215600 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): IOReturn IOMobileFramebufferUserClient::set_hotplug_notify(void *, void *) 0x849d5000 0x876e8828 0x314b3f0d 0xe215600 Apr 8, 2012 10:08:14 PM - kernel [0] (Debug): bool AppleRGBOUT::power_down_hardware(), clock down RGBOUT Apr 8, 2012 10:08:14 PM - SpringBoard [15] (Notice): IOMobileFrameBufferGetMirroringCapability returning -536870201 via kIOMFBConnectMethod_GetMirroringCapability  Apr 8, 2012 10:08:14 PM - backupd [21] (Warning): INFO: Account changed (enabled=0, accountID=159665024) Apr 8, 2012 10:08:13 PM - kernel [0] (Debug): launchd[17] Builtin profile: ptpd (sandbox) Apr 8, 2012 10:08:13 PM - UserEventAgent [12] (Warning): Factory called Apr 8, 2012 10:08:13 PM - configd [14] (Error): WiFi:[355640893.157493]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:13 PM - configd [14] (Error): WiFi:[355640893.158197]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:13 PM - configd [14] (Error): WiFi:[355640893.158878]: bootstrap_look_up of WiFiManager server failed Apr 8, 2012 10:08:13 PM - UserEventAgent [12] (Notice): (Note ) PIH: MCUEAPlugin initialized. Apr 8, 2012 10:08:13 PM - UserEventAgent [12] (Error): Querying interface Apr 8, 2012 10:08:13 PM - configd [14] (Error): ioctl(SIOCGIFCAP) failed: Device not configured Apr 8, 2012 10:08:13 PM - configd [14] (Error): ioctl(SIOCGIFCAP) failed: Device not configured Apr 8, 2012 10:08:13 PM - configd [14] (Notice): setting hostname to "Petes-iPod" Apr 8, 2012 10:08:13 PM - configd [14] (Notice): network configuration changed. Apr 8, 2012 10:08:13 PM - UserEventAgent [12] (Warning): TRACE: sending {    command = kMBMessageAccountChanged; } Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) profiled: Service starting... Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) profiled: Performing boot time checks. Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) MC: Checking for MDM installation... Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) MC: ...finished checking for MDM installation. Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) profiled: Checking for new carrier profile... Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) profiled: Installing new carrier profile. Apr 8, 2012 10:08:13 PM - profiled [20] (Notice): (Note ) profiled: Carrier profile has already been installed. Apr 8, 2012 10:08:12 PM - com.apple.launchd [1] (Warning): (com.apple.ptpd) The exception server is already claimed! Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: mitigation behavior enabled Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: camera equations enabled Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: thermal monitoring enabled Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: registered for wake notification Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 0 to 16384 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 1 to 546 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 2 to 5461 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 3 to 6553 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 4 to 5461 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 5 to 5461 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 6 to 16384 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 9 to 5461 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set decay on sensor 10 to 5461 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: Set AppleARMPerformanceControllerDVDFactor1 dithering level to 101% Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: Set AppleARMPerformanceControllerDVDFactor0 dithering level to 100% Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: Set charge rate index to 0 Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: HID not ready cannot set BL Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: setting thermal status level to 0 (0) [-32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768] Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: set allowable transmit power limit to 24.000 dBm [-32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768] Apr 8, 2012 10:08:12 PM - CLTM [12] (Error): CLTM: Could not close relay file Apr 8, 2012 10:08:12 PM - CLTM [12] (Notice): CLTM: thermtgraphrelay is not present

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• Runge-Kutta (RK4) integration for game physics

  - by Kai

  Gaffer on Games has a great article about using RK4 integration for better game physics. The implementation is straightforward but the math behind it confuses me. I understand derivatives and integrals on a conceptual level but I haven't manipulated equations in a long time. Here's the brunt of Gaffer's implementation: void integrate(State &state, float t, float dt) { Derivative a = evaluate(state, t, 0.0f, Derivative()); Derivative b = evaluate(state, t+dt*0.5f, dt*0.5f, a); Derivative c = evaluate(state, t+dt*0.5f, dt*0.5f, b); Derivative d = evaluate(state, t+dt, dt, c); const float dxdt = 1.0f/6.0f * (a.dx + 2.0f*(b.dx + c.dx) + d.dx); const float dvdt = 1.0f/6.0f * (a.dv + 2.0f*(b.dv + c.dv) + d.dv) state.x = state.x + dxdt * dt; state.v = state.v + dvdt * dt; } Can anybody explain in simple terms how RK4 works? Specifically, why are we averaging the derivatives at 0.0f, 0.5f, 0.5f, and 1.0f? How is averaging derivatives up to the 4th order different from doing a simple euler integration with a smaller timestep? After reading the accepted answer below, and several other articles, I have a grasp on how RK4 works. To answer my own questions: Can anybody explain in simple terms how RK4 works? RK4 takes advantage of the fact that we can get a much better approximation of a function if we use its higher-order derivatives rather than just the first or second derivative. That's why the Taylor series converges much faster than Euler approximations. (take a look at the animation on the right side of that page) Specifically, why are we averaging the derivatives at 0.0f, 0.5f, 0.5f, and 1.0f? The Runge-Kutta method is an approximation of a function that samples derivatives of several points within a timestep, unlike the Taylor series which only samples derivatives of a single point. After sampling these derivatives we need to know how to weigh each sample to get the closest approximation possible. An easy way to do this is to pick constants that coincide with the Taylor series, which is how the constants of a Runge-Kutta equation are determined. This article made it clearer for me: http://web.mit.edu/10.001/Web/Course%5FNotes/Differential%5FEquations%5FNotes/node5.html. Notice how (15) is the Taylor series expansion while (17) is the Runge-Kutta derivation. How is averaging derivatives up to the 4th order different from doing a simple euler integration with a smaller timestep? Mathematically it converges much faster than doing many Euler approximations. Of course, with enough Euler approximations we can gain equal accuracy to RK4, but the computational power needed doesn't justify using Euler.

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• Very slow compile times on Visual Studio

  - by johnc

  We are getting very slow compile times, which can take upwards of 20+ minutes on dual core 2GHz, 2G Ram machines. A lot of this is due to the size of our solution which has grown to 70+ projects, as well as VSS which is a bottle neck in itself when you have a lot of files. (swapping out VSS is not an option unfortunately, so I don't want this to descend into a VSS bash) We are looking at combing projects (not nice, as we like the separation of concerns, but is a good opportunity to refactor away some dead wood). We are also looking at having multiple solutions to achieve greater separation of concerns and quicker compile times for each element of the application. This I can see will become a dll hell as we try to keep things in synch. I am interested to know how other teams have dealt with this scaling issue, what do you do when your code base reaches a critical mass that you are wasting half the day watching the status bar deliver compile messages UPDATE Apologies, I neglected to mention this is a C# solution. Thanks for all the cpp suggestions, but it's been a few years since I've had to worry about headers. At a distance I say I miss C++, but I'm not sure I want to go back EDIT: Nice suggestions that have helped so far (not saying there aren't other nice suggestions below, just what has helped) New 3GHz laptop - the power of lost utilization works wonders when whinging to management Disable Anti Virus during compile 'Disconnecting' from VSS (actually the network) during compile - I may get us to remove VS-VSS integration altogether and stick to using the VSS UI Still not rip-snorting through a compile, but every bit helps. Orion did mention in a comment that generics may have a play also. From my tests there does appear to be a minimal performance hit, but not high enough to sure - compile times can be inconsistent due to disc activity. Due to time limitations, my tests didn't include as many Generics, or as much code, as would appear in live system, so that may accumulate. I wouldn't avoid using generics where they are supposed to be used, just for compile time performance WORKAROUND We are testing the practice of building new areas of the application in new solutions, importing in the latest dlls as required, them integrating them into the larger solution when we are happy with them. We may also do them same to existing code by creating temporary solutions that just encapsulate the areas we need to work on, and throwing them away after reintegrating the code. We need to weigh up the time it will take to reintegrate this code against the time we gain by not having Rip Van Winkle like experiences with rapid recompiling during development.

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• Windows CE Programming Serial Port - Getting Garbled Output

  - by user576639

  I am programming a Windows CE 6 device (Motorola MC3100 scanner Terminal). Using Lazarus FPC to compile it. After 3 weeks work I reluctantly post here in the hope someone can suggest why I am getting garbled output from the serial port. The code I am using is posted below. This is the standard code I have found from several places. The OpenPort works OK. When I send the string using SendString('ABCDEF') I get garbled input to the PC Serial port such as: 4[#131][#26][#0][#0][#0][#0] (the bracketed data indicates that it is a non-printable character ASCII Code) Obviously it is connecting to the port OK AND it is sending the correct no of characters (7). I have tried all combinations of Baud Rate, Data Bits, Parity and Stop Bits without any joy. Also tried changing cable, on a different PC etc. Could it be I need to set something else in the DCB? Any help or suggestions would be GREATLY appreciated. unit Unit1; {$mode objfpc}{$H+} interface uses Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls, ExtCtrls, Windows, LResources; type { TForm1 } TForm1 = class(TForm) Button1: TButton; Button2: TButton; Label1: TLabel; procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); function OpenPort(ComPort:String;BaudRate,ByteSize,Parity,StopBits:integer):String; procedure SendString(str:String); private { private declarations } public { public declarations } end; var Form1: TForm1; cc:TCOMMCONFIG; Connected:Boolean; implementation {$R *.lfm} var F: TextFile; var hComm: THandle; str: String; lrc: LongWord; { TForm1 } function OpenPort(ComPort:String;BaudRate,ByteSize,Parity,StopBits:integer):String; var cc:TCOMMCONFIG; SWide:WideString; Port:LPCWSTR; begin SWide:=ComPort; Port:=PWideChar(SWide); result:=''; if (1=1) then begin Connected:=False; hComm:=CreateFile(Port, GENERIC_READ or GENERIC_WRITE,0, nil,OPEN_EXISTING,0,0); if (hComm = INVALID_HANDLE_VALUE) then begin ShowMessage('Fail to Open'); exit; end; GetCommState(hComm,cc.dcb); cc.dcb.BaudRate:=BaudRate; cc.dcb.ByteSize:=ByteSize; cc.dcb.Parity:=Parity; cc.dcb.StopBits:=StopBits; if not SetCommState(hComm, cc.dcb) then begin result:='SetCommState Error!'; CloseHandle(hComm); exit; end; Connected:=True; end; end; procedure TForm1.Button1Click(Sender: TObject); begin OpenPort('COM1:',9600,8,0,0); end; procedure TForm1.Button2Click(Sender: TObject); begin SendString('ABCDEFG'); end; procedure TForm1.SendString(str:String); var lrc:LongWord; begin if (hComm=0) then exit; try if not PurgeComm(hComm, PURGE_TXABORT or PURGE_TXCLEAR) then raise Exception.Create('Unable to purge com: '); except Exit; end; WriteFile(hComm,str,Length(str), lrc, nil); end; end.

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• Automatic incremental SQL Script generation for incremental, nightly builds when using Team Build in

  - by Steve Johnson

  hi all, hope that everybody here is OK. We are using VS 2008 as development tool, TFS 2008 as version control as well as build automation. Some of our developer use dbpro for databases changes and some use SQL Server management studio. I am trying to automate build for Web Application built using C# and VB.Net. Our scenario is such that we have a central database to which our web application connects. Whenever we supply our clients with a new functionality or a bug fix, we supply them incremental builds. The SQL script is checked into source control for every incremental build when they have made and tested there changes on our central DB Server. I want to generate Differential script that can be run at the client as an incremental update script. Now to come about it is a problem. Sometimes our developers tend to forget the database change-sets and the script in the source control is missing an SP or a two. Also, sometimes we need to insert default data into some of the tables that have strict stringent values and not test values. Like a table that contains Services provided by the panel, we add a new service name, signature, credentials and service address, etc etc in the ServiceTable. Besides this many other tables may have test data that may not be needed. If we use DataCompare, it will generate changeset for required data (important for client to enable certain services) and our test data that was added to the database as a result of our testing of the functionality or bug fix. Currently i am using SQLSchemaCompareTask (from Visual Studio 2008 Team Database Professional Power Tools API) in the TFSBuild.proj file of the build definition for TFS 2008. Using SQLSchemaCompareTask, the script generated contains database names like [dbo]. etc which are not desired as the script fails when run against SQL Server 2000 databses (Some of our client still use SQL Server 2000) databases as teh backend of the application. Also default data can't be generated by this process. To overcome this problem, i have to come up with a solution that can compare databases and generate script automatically that does not have to be manually reviewed again before being sent to the client. Please suggest effective methodology of such SQL script generation and suggest whether two different databases may be used or something ? Is there any toolkit or api that can enable build automation for SQL Server databases? Thank you all. Regards Steve

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• Azure storage: Uploaded files with size zero bytes

  - by Fabio Milheiro

  When I upload an image file to a blob, the image is uploaded apparently successfully (no errors). When I go to cloud storage studio, the file is there, but with a size of 0 (zero) bytes. The following is the code that I am using: // These two methods belong to the ContentService class used to upload // files in the storage. public void SetContent(HttpPostedFileBase file, string filename, bool overwrite) { CloudBlobContainer blobContainer = GetContainer(); var blob = blobContainer.GetBlobReference(filename); if (file != null) { blob.Properties.ContentType = file.ContentType; blob.UploadFromStream(file.InputStream); } else { blob.Properties.ContentType = "application/octet-stream"; blob.UploadByteArray(new byte[1]); } } public string UploadFile(HttpPostedFileBase file, string uploadPath) { if (file.ContentLength == 0) { return null; } string filename; int indexBar = file.FileName.LastIndexOf('\\'); if (indexBar > -1) { filename = DateTime.UtcNow.Ticks + file.FileName.Substring(indexBar + 1); } else { filename = DateTime.UtcNow.Ticks + file.FileName; } ContentService.Instance.SetContent(file, Helper.CombinePath(uploadPath, filename), true); return filename; } // The above code is called by this code. HttpPostedFileBase newFile = Request.Files["newFile"] as HttpPostedFileBase; ContentService service = new ContentService(); blog.Image = service.UploadFile(newFile, string.Format("{0}{1}", Constants.Paths.BlogImages, blog.RowKey)); Before the image file is uploaded to the storage, the Property InputStream from the HttpPostedFileBase appears to be fine (the size of the of image corresponds to what is expected! And no exceptions are thrown). And the really strange thing is that this works perfectly in other cases (uploading Power Points or even other images from the Worker role). The code that calls the SetContent method seems to be exactly the same and file seems to be correct since a new file with zero bytes is created at the correct location. Does any one have any suggestion please? I debugged this code dozens of times and I cannot see the problem. Any suggestions are welcome! Thanks

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• How to improve compare of item in sorted List<MyItem> with item before and after current item?

  - by Oliver

  Does anyone know about a good way to accomplish this task? Currently i'm doing it more ore less this way, but i'm feeling someway unhappy with this code, unable to say what i could immediately improve. So if anyone has a smarter way of doing this job i would be happy to know. private bool Check(List<MyItem> list) { bool result = true; //MyItem implements IComparable<MyItem> list.Sort(); for (int pos = 0; pos < list.Count - 1; pos++) { bool previousCheckOk = true; if (pos != 0) { if (!CheckCollisionWithPrevious(pos)) { MarkAsFailed(pos); result = false; previousCheckOk = false; } else { MarkAsGood(pos); } } if (previousCheckOk && pos != list.Count - 1) { if (!CheckCollisionWithFollowing(pos)) { MarkAsFailed(pos); result = false; } else { MarkAsGood(pos); } } } return result; } private bool CheckCollisionWithPrevious(int pos) { bool checkOk = false; var previousItem = _Item[pos - 1]; // Doing some checks ... return checkOk; } private bool CheckCollisionWithFollowing(int pos) { bool checkOk = false; var followingItem = _Item[pos + 1]; // Doing some checks ... return checkOk; } Update After reading the answer from Aaronaught and a little weekend to refill full mind power i came up with the following solution, that looks far better now (and nearly the same i got from Aaronaught): public bool Check(DataGridView dataGridView) { bool result = true; _Items.Sort(); for (int pos = 1; pos < _Items.Count; pos++) { var previousItem = _Items[pos - 1]; var currentItem = _Items[pos]; if (previousItem.CollidesWith(currentItem)) { dataGridView.Rows[pos].ErrorText = "Offset collides with item named " + previousItem.Label; result = false; sb.AppendLine("Line " + pos); } } dataGridView.Refresh(); return result; }

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• Strategy and AI for the game 'Proximity'

  - by smci

  'Proximity' is a strategy game of territorial domination similar to Othello, Go and Risk. Two players, uses a 10x12 hex grid. Game invented by Brian Cable in 2007. Seems to be a worthy game for discussing a) optimal strategy then b) how to build an AI Strategies are going to be probabilistic or heuristic-based, due to the randomness factor, and the high branching factor (starts out at 120). So it will be kind of hard to compare objectively. A compute time limit of 5s per turn seems reasonable. Game: Flash version here and many copies elsewhere on the web Rules: here Object: to have control of the most armies after all tiles have been placed. Each turn you received a randomly numbered tile (value between 1 and 20 armies) to place on any vacant board space. If this tile is adjacent to any ally tiles, it will strengthen each tile's defenses +1 (up to a max value of 20). If it is adjacent to any enemy tiles, it will take control over them if its number is higher than the number on the enemy tile. Thoughts on strategy: Here are some initial thoughts; setting the computer AI to Expert will probably teach a lot: minimizing your perimeter seems to be a good strategy, to prevent flips and minimize worst-case damage like in Go, leaving holes inside your formation is lethal, only more so with the hex grid because you can lose armies on up to 6 squares in one move low-numbered tiles are a liability, so place them away from your main territory, near the board edges and scattered. You can also use low-numbered tiles to plug holes in your formation, or make small gains along the perimeter which the opponent will not tend to bother attacking. a triangle formation of three pieces is strong since they mutually reinforce, and also reduce the perimeter Each tile can be flipped at most 6 times, i.e. when its neighbor tiles are occupied. Control of a formation can flow back and forth. Sometimes you lose part of a formation and plug any holes to render that part of the board 'dead' and lock in your territory/ prevent further losses. Low-numbered tiles are obvious-but-low-valued liabilities, but high-numbered tiles can be bigger liabilities if they get flipped (which is harder). One lucky play with a 20-army tile can cause a swing of 200 (from +100 to -100 armies). So tile placement will have both offensive and defensive considerations. Comment 1,2,4 seem to resemble a minimax strategy where we minimize the maximum expected possible loss (modified by some probabilistic consideration of the value ß the opponent can get from 1..20 i.e. a structure which can only be flipped by a ß=20 tile is 'nearly impregnable'.) I'm not clear what the implications of comments 3,5,6 are for optimal strategy. Interested in comments from Go, Chess or Othello players. (The sequel ProximityHD for XBox Live, allows 4-player -cooperative or -competitive local multiplayer increases the branching factor since you now have 5 tiles in your hand at any given time, of which you can only play one. Reinforcement of ally tiles is increased to +2 per ally.)

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