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• CentOS 6.3 X86_64 RAM detection

  - by Peter

  I have a machine with 8GB ram (BIOS sees it, so my motherboard and CPU supports it), and I installed CentOS 6.3 on it. When it starts up, it only see 3.1GB. uname says: 2.6.32-279.1.1.el6.x86_64 #1 SMP BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000cf65f000 (usable) BIOS-e820: 00000000cf65f000 - 00000000cf6e8000 (ACPI NVS) BIOS-e820: 00000000cf6e8000 - 00000000cf6ec000 (usable) BIOS-e820: 00000000cf6ec000 - 00000000cf6ff000 (ACPI data) BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable) dmesg | grep -i memory says: initial memory mapped : 0 - 20000000 init_memory_mapping: 0000000000000000-00000000cf700000 Reserving 129MB of memory at 48MB for crashkernel (System RAM: 3319MB) PM: Registered nosave memory: 000000000009f000 - 00000000000a0000 PM: Registered nosave memory: 00000000000a0000 - 00000000000e0000 PM: Registered nosave memory: 00000000000e0000 - 0000000000100000 PM: Registered nosave memory: 00000000cf65f000 - 00000000cf6e8000 PM: Registered nosave memory: 00000000cf6ec000 - 00000000cf6ff000 Memory: 3184828k/3398656k available (5152k kernel code, 1016k absent, 212812k reserved, 7166k data, 1260k init) please try 'cgroup_disable=memory' option if you don't want memory cgroups Initializing cgroup subsys memory Freeing initrd memory: 16136k freed Non-volatile memory driver v1.3 agpgart-intel 0000:00:00.0: detected 8192K stolen memory crash memory driver: version 1.1 Freeing unused kernel memory: 1260k freed Freeing unused kernel memory: 972k freed Freeing unused kernel memory: 1732k freed Update: Memtest see all the 8GB, and dmidecode -t 17 | grep Size too. But free -m still see only 3.1 GB. Question: How can I repair/modify the system, to see all the 8GB RAM? Thanks in advance!

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• Thin client - cloud machine - to run via iPad, iPhone, most Androids etc

  - by Carl Lindberg

  I'm tired of having a laptop macbook that breaks down or having files that I need to sync via dropbox etc all the time via the machines to different OS installations. It sucks. I want a thin client where I can login on any machine - my iPhone, PC desktop, iPad etc to one running machine. I would like to replace a modernly powerful desktop iMac with a thin client running via my iPad. I will connect the iPad with a keyboard/mouse too so you get the idea. But I want to be able to use some of the Android phones as well (I guess most Android phones today has a good enough performance/resolution etc to run a thin client). Of course it has to be able to have input/output in sound. Printing can be solved by PDF/emailing etc - so no direct communication to the printer ports to USB etc is necessary. Is there such a service today? It should cost somewhere under something like $40/ month. I will run stuff like CPU heavy duty ableton for music production, xCode for making iOS apps, some games etc. And on the thin client also run virtual machines. VM of Ubuntu and Windows.

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• Drobo FS vs Lime Technology unRAID vs FreeNAS

  - by elluca

  I already decided to by a drobo fs until I just found these two tests: http://www.digitalversus.com/data-robotics-drobo-fs-p889_9543_487.html http://www.digitalversus.com/lime-technology-unraid-p889_8992_473.html The two cons agains drobo for me: loudness price What disadvantages has the unraid stuff against the drobo fs? Has it also got that ease of use like swapping drives on the go, simply extend capacity by plugging in new drives, notify me of drive errors, disk failure protection, dynamic space of "partitions", better/worse effective capacity, etc. Which is more secure? Am I able to simply replace a bad drive with a new one on unraid? What happens if my pc fails? Lets say the cpu overheats. Since I have a complete pc which is going to be replaced, I only have to pay the software to use unraid. I am going to use my nas for: music library (how well does it integrate with iTunes? ) picture library movie library development (i need to be able to be to use time machine) I am going to use this nas with a MacBook pro. My current disks: 2x 500Gb 1x 1.5Tb 1x 2Tb On a drobo fs I would have 2.26 Tb of space. What would it be on unraid? Is FreeNAS also an alternative?

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• repair partition table

  - by m.sr

  Hallo. I've just overwritten my partition table of my system's hard disk. i made a cfdisk on the wrong device (/dev/sda instead of /dev/sdd), deleted all partitions, made one new primary spanning over the whole device, set its type to 07 (NTFS) and hit write. So here i am with my system running. Until i reboot, i hope/guess nothing will change - meaning: all my data is accessible (I'm currently making a dd-backup of the whole device and plan to make a .tar.gz-backup of the most important data later). I also backed up /proc/partitions, /proc/diskstats (even though i guess this is more about throughput and stuff like this ...) and /sys/block/sda/sda?/{start,size}. Some further things i know: 4 primary partitions 1st partition: ~100Mb, ext3, /boot 2nd partition: ~100Mb, "Win7 Boot Partition", ntfs(?) 3rd partition: ~20...30GB, Win7, ntfs 4th partition: ~20...30GB, luks-encrypted device The luks- de crypted device is a LVM-PV The /, /home & swap-partitions are all LVs on the (VG on the) above noted PV So my questions: What is the simplest way to just write the kernels partition table to the disk? What is the simplest way to take the above mentioned (and perhaps other I don't know of ...) data and generate the partition table? Are there any problems to take care of regarding to luks and/or lvm? Is there any data I should backup before rebooting (meanig stuff from kernel [ /sys/..., /proc/...] and so on, which could help me regenerate the partition table)? Thanks a lot! P.S.: debian sid, Kernel 2.6.34-1-amd64 from debian-experimental, 80GB Intel SSD

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• How to get gigabit network speeds on Windows XP?

  - by JB

  We've just installed gigabit switches at work, and things on the Linux side are going well. Our linux boxes, which use a Intel Corporation 82566DM-2 Gigabit nic (according to lspci), consistently get over 900 mbits/sec: iperf -c ipserver ------------------------------------------------------------ Client connecting to ipserver, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.40.9 port 39823 connected with 192.168.1.115 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.08 GBytes 929 Mbits/sec We have a bunch of Windows XP 64-bit machines that use Broadcom NetXtreme 57xx cards. I spent around a day trying to get equivalent speeds on them, but couldn't get above 200 Mbits/sec. I noticed the Windows iperf tests said that the TCP window size was 8 Kb by default (as opposed to 16 Kb on Linux, so I modified my test to reflect that. Still no love. I went to Broadcom's site, downloaded the latest drivers for the card and installed. Still no love. However, finally, I tried a 64 Kb window size with the new drivers, and finally an improvement! $ iperf -c ipserver -w64k ------------------------------------------------------------ Client connecting to ipserver, TCP port 5001 TCP window size: 64.0 KByte ------------------------------------------------------------ [ 3] local 192.168.40.214 port 1848 connected with 192.168.1.115 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 933 MBytes 782 Mbits/sec Much better, but still not really taking advantage of the full capabilities of the network. If the Linux box can reach 950 Mbits/sec consistently, this box should be able to as well. Also, if you're wondering about the medium, this is over the same cable...I'm switching back and forth. Any suggestion or ideas would be really welcome. Thanks!

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• APACHE - PHP - Bounce emails

  - by user1179459

  I want to improve our mail server lists by handling all the bounces we get in our websites. I have a website which has over 8000+ users and another website which as over 1500+ users, they are emailed various notifications every second, ie. job alerts, email alerts, I am using POP connections with EXIM on APACHE server, most scripts are based on PHP language generates email on the fly. Problems i have But some users has registered long time ago and now quite few has bounce email address Some users register with dummy emails like [email protected] which never existed but a valid email address, any chance of stopping this without asking them login to the email account and clicking links which dont work most times.. (too annoying to the end user) Server is sending unnecessary emails can be avoided if i know they dont exists ? Solutions i need to have Is there a way i can download the bounce email list somewhere (WHM/Cpanel), i know exim mail has it but its not readable (i need a file like CSV or something similar to scan them over and write a php script to delete the users from the database ?) I need to know if there is any function in the PHP that can check the existence of the email address on the fly ? so that i can set the email send function in the mailer class to check before it sends out. On the server will bouncing emails are going to eatup lots of server resources ? like memory/cpu on processing them ? or are they are minimal where we dont have to worry about this at all ? May be a opensoruce or linux software to capture them and view them in a report basis and cleaning them up ? I am not a linux expert or server admin but i do lot of PHP coding, so please be descriptive of the solutions specially if they are linux commands Thank you!

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• Format & Fresh Install Mac OS X Snow Leopard on Mac mini.

  - by sagar

  Hello Every one. I have purchased a DVD of Snow Leopard (Mac OS X 10.6.2) I purchased a Mac mini with Leopard (Mac OS X 10.5.7) I tried to install Mac OS X 10.6.2 Everything went perfectly. System was installed successfully. But the problem that I faced is as follows. System was installed but my older data remained as it is. (means installation didn't format every thing - means installation was done on upgrade basis.) Now, my system works with very low speed. Previous performance of Mac mini was double as compare to current upgrade version. Now - my question are as follows. Does an upgrade installation causes the performance issues in Mac OS X? Or is Snow Leopard too demanding for the Mac mini? ( 2 Ghz Intel Core 2 Duo, 1GB RAM - is this configuration OK for Snow Leopard? ) Does a fresh install work better than an upgrade?

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• It takes a long time until Windows XP recognize I connected USB drive

  - by Pavol G

  I have a problem with my new USB disk. When I connect it to my laptop with Windows XP SP2 it takes about 4-5min until Windows recognizes it and shows it as a new disk. I can also see (disk's LED is blinking) that something is scanning the disk when I connect it; when this is done Windows immediately recognize it. Also when I'm copying data to this disk the speed is about 3.5MB/sec. It's connected using USB2.0. I tried to check for spyware (using Spybot), also tried running Windows in safe mode. But still have the same problems. Do you have any idea what could help to solve this problem? On Windows Vista (another laptop) everything is ok, disk loads in about 15sec and speed is about 20-30MB/sec. Edit: I tried to update to SP3 - no change Edit2: When this "strange" scanning occurs I can see that DPCs process is taking about 50% of CPU. When the scan ends (after 5min) this process take 0% again. Edit3: About the scan time, currently it's taking about 5min, but this time is growing as I'm adding more data to the disk, currently its about 40GB and I don't want to see how long it will take with 1000GB. Thanks a lot for every advice!

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• Analyze a BSOD (irql_less_than_or_equal)

  - by Bruno Reis

  Hello. About 2 months ago I bought a new system and built it at home: Mother board: XFX X58i Processor: Core i7 920, using the stock cooler Memory: 3x2GB Corsair DDR3 1600 Video card: NVIDIA GTS 250 (1GB) Hard disk: 2x WD 500GB, 7200rpm I have 2 screens plugged into the video card, and the system is connected to a 550W PSU. Nothing is overclocked. After building the system, I stressed it a lot with Prime95 and rthdribl to check its stability. All my tests were perfect. So I reinstalled Win 7 x64 Professional and started using it normally. The first week (2010-03-15) I got the infamous irql_less_than_or_equal BSOD. Ten days after (2010-03-24) I got another one. Then on 2010-04-09, 2010-05-04. Since 2 days ago it became worse: I got one bluescreen per day! (2010-05-12, 2010-05-13, 2010-05-14). I installed BlueScreenView to try to obtain some information, but I'm not able to extract any useful information apart from the bug check string (irql_less_than_or_equal), and that it was caused by ntoskrnl.exe (the first three at ntoskrnl.exe+71f00, the last 4 at ntoskrnl.exe+70600 -- which I suspect could be the same thing, as Microsoft could have patched this file in the mean time, so the address of the function causing it changed). Then I stressed my memory sticks with memtest, they worked perfectly. After booting, I've stressed my GPU with FurMark and RTHDRIBL, everything was fine. Then I stressed the CPU with 4 instances of Prime95 while monitoring the temperature -- that never exceeded 85oC with the case closed --, everything fine. Finally I've stressed the whole system with HeavyLoad for a looooong time, everything worked just fine. So, I have stressed most of the components of the system, but couldn't get any useful information from it. Do you have any hint on what else can I do to find the culprit? Thanks Bruno

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• What do you upgrade to make games load faster? [on hold]

  - by Superbest

  Let's say you have a relatively modern game like Shogun 2. The loading screens take several minutes. This bothers you and you'd like to improve it. What is actually going on when loading screens are up? I'm guessing assets are being loaded into memory from disk, and possibly being decompressed first. However, what is actually causing the slow down? The memory? Mainboard? CPU? HDD? If you had $100 to spend on upgrades and your only goal is to speed up loading screens without reducing other performance, what component of the computer does it make sense to upgrade for maximum benefit? If your answer is "it depends on the existing setup", what sort of benchmarks would you run to determine what is causing the bottleneck? What if you had $500 instead? I give the two budgets for context. I am not asking for actual recommendations about which component to buy (nor are the numbers supposed to be rigid limits), but what features are important when shopping for components with small and large budgets (a large budget could allow buying multiple components which are not so good on their own, but work particularly well together). I mention Shogun 2 as an example, but I'm asking about reducing overall loading times, across all games, not just one game. Therefore, "put it on a solid state disk" probably won't be good solution, because putting every game on your SDD will quickly fill it up.

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• Win 7: apps crash, then explorer crashes, then services fail, then boom

  - by snorfys

  Periodically, every 2-3 days one of my systems will go haywire: every app will crash search will fail via the start menu and then explorer will fail. Restarting explorer via taskmanager will cause it to fail again, then it'll BSOD and restart. The eventlog for when this happens goes something like this every time: ERROR: Session "ReadyBoot" stopped due to the following error: 0xC0000188 (supposedly not a problem) WARNING: The maximum file size for session "ReadyBoot" has been reached... (forget where I found out, but also 'not a problem') ERROR: Session "Circular Kernel Context Logger" stopped due to the following error: 0xC0000188 (again, supposedly not a problem) WARNING: The maximum file size for session "Circular Kernel Context Logger" has been reached... ERROR: Faulting application name: Explorer.EXE, version: 6.1.7600.16450, time stamp:... ERROR: Faulting application name: explorer.exe, version: 6.1.7600.16450, time stamp:... ERROR: Faulting application name: svchost.exe_iphlpsvc, version: 6.1.7600.16385, time stamp:... ERROR: The Service Name service terminated unexpectedly. It has done this 1 time(s) That last one happens a number of times but with a different service name. Then finally we have: ERROR: The Service Control Manager tried to take a corrective action (Restart the service) after the unexpected termination of the Server service, but this action failed with the following error: An instance of the service is already running. After that, I have my BSOD and logs complaining that windows started up without shutting down. It's a new machine: Intel i3 530 4gb RAM (Ran memtest for 4 hrs, no problems) 320GB WD/250GB Seagate HDDs (Happened on fresh installs on 2 separate HDDs) Win7 Pro/Ultimate x64 (wife's copy of pro, my copy of ult, no change) Fresh install + driver and windows update (happened without updates as well) I'm at a bit of a loss as to what I can look at next. Especially since it'll work like a charm for 2-3 days and then it's hooped for a night (I'm on it now in fact - no problems).

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• Can I setup a test server and then transfer everything to a diff. production server?

  - by Justin

  Hello, I am going to be setting up a "real" server, but it's not being shipped for another week. I was planning on setting up most of the server's functionality using an extra workstation I have. I wanted to set-up Windows Server 2003 or 2008, IIS, Terminal Services, Firewall, and Antivirus on this regular machine. I'd also be installing software like Winzip and VMWare that'll be used on the server. I can't ghost the machine, as far as I've done in the past, because the motherboard/cpu/etc. will all be different. Is there any way to export all of the "server settings" or something like that so I can move everything from test to production? Is there any software out there that does something similar to this? Some things I'm going to have to wait on such as setting up the file server completely in its raid configuration, but I'd like to get the simple server stuff and network setup out of the way. Has anyone done this before? Do I need software, open-source or not, to do this? Or maybe there's a way to export all the server settings in some way? Thanks in advance! Justin

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• Abysmal transfer speeds on gigabit network

  - by Vegard Larsen

  I am having trouble getting my Gigabit network to work properly between my desktop computer and my Windows Home Server. When copying files to my server (connected through my switch), I am seeing file transfer speeds of below 10MB/s, sometimes even below 1MB/s. The machine configurations are: Desktop Intel Core 2 Quad Q6600 Windows 7 Ultimate x64 2x WD Green 1TB drives in striped RAID 4GB RAM AB9 QuadGT motherboard Realtek RTL8810SC network adapter Windows Home Server AMD Athlon 64 X2 4GB RAM 6x WD Green 1,5TB drives in storage pool Gigabyte GA-MA78GM-S2H motherboard Realtek 8111C network adapter Switch dLink Green DGS-1008D 8-port Both machines report being connected at 1Gbps. The switch lights up with green lights for those two ports, indicating 1Gbps. When connecting the machines through the switch, I am seeing insanely low speeds from WHS to the desktop measured with iperf: 10Kbits/sec (WHS is running iperf -c, desktop is iperf -s). Using iperf the other way (WHS is iperf -s, desktop iperf -c) speeds are also bad (~20Mbits/sec). Connecting the machines directly with a patch cable, I see much higher speeds when connecting from desktop to WHS (~300 Mbits/sec), but still around 10Kbits/sec when connecting from WHS to the desktop. File transfer speeds are also much quicker (both directions). Log from desktop for iperf connection from WHS (through switch): C:\temp>iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [248] local 192.168.1.32 port 5001 connected with 192.168.1.20 port 3227 [ ID] Interval Transfer Bandwidth [248] 0.0-18.5 sec 24.0 KBytes 10.6 Kbits/sec Log from desktop for iperf connection to WHS (through switch): C:\temp>iperf -c 192.168.1.20 ------------------------------------------------------------ Client connecting to 192.168.1.20, TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [148] local 192.168.1.32 port 57012 connected with 192.168.1.20 port 5001 [ ID] Interval Transfer Bandwidth [148] 0.0-10.3 sec 28.5 MBytes 23.3 Mbits/sec What is going on here? Unfortunately I don't have any other gigabit-capable devices to try with.

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• Throughput; capacity planning help for C10K like design

  - by z8000

  I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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• How can I fix video tearing and pausing on Windows XP Flash videos?

  - by xvs

  I have what should be a reasonably fast PC: it's a Quadcore Intel 6600 at 2.4 GHz, 4MB of RAM, an ATI 3800 series video card and an LG L246WP monitor, which I selected particularly because it was supposed to work well with video and have no trails or other artifacts. So I should be able to play video with no problems. And I can, as long as that video isn't Flash video. With Flash, what I see is tearing, especially during pans, and pausing -- every few seconds the video pauses for about 300ms while the sound stays continuous. I tried going into the video card setup and changing vertical sync, pulldown detection, windows media video acceleration, deinterlacing and triple buffering. but no combination of settings I've tried has changed or corrected the problem in any way. I've also tried enabling and disabling hardware acceleration in the Flash settings, to no avail. This problem happens whether or not the video is streaming or has fully streamed in before playing. So, what can I do? Is this just a flash issue or is there a way to get it to work?

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• Value of Itanium over x86_64 for Oracle Deployment

  - by Antitribu

  We are looking at a new environment to run our Oracle Database running on SUSE (potentially migrating to RedHat). Our database is approximately 100GB and performs adequately on our current hardware (x86_64) with approximately 6GB of ram allocated to it. We are growing quickly however and will require more performance shortly. Given the cost of Oracle licenses we would like to maximize the value from each license by choosing the most appropriate CPU to run the software on. The questions are: Are there substantial benefits to looking at Itanium hardware, are there any drawbacks? Is there a point where Itanium starts to scale out better? What are the long term support options for Itanium? Given the dominance of x86 would it be safer long term to stick with x86? On average what would be the performance benefit of implementing an Oracle database on Itanium over x86_64? Is this an issue at all or will other factors (IO/RAM) cap out first? If anyone can point me towards some solid documentation on comparisons between the two platforms that provides good case analysis of when to choose which I'm more than happy to accept that as an answer.

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• Ubuntu lucid, maverick high iowait

  - by netom

  I'm using Ubuntu, and I've got the same problem with Lucid and Maverick. From time to time, especially a few minutes after boot, the iowait goes between 50-100% and the box is unusable. Everything that tries to access the disk freezes. I have the following setup: Hard disk: Model Family: Western Digital Caviar Green family Device Model: WDC WD15EADS-00P8B0 Serial Number: WD-WMAVU0391287 Firmware Version: 01.00A01 User Capacity: 1.500.301.910.016 bytes I have a quad core Intel Core2 Q6600 processor, and 4G of memory. When the high iowait occurs, usually 4 processes are active: kdmflush (two procs) jbd2/dm-0-8 jbd2/db-1-8 and a few more starving user processes of course. I know this from top and iotop. Any suggestions about why this is happening? There are a lot of q/a-s about linux and high iowait, but none of them helped so far, I even tweaked the hard disk not to park the head in every 8 seconds (Load cycle count is 50334!!!!! :o ), but nothing. Problem persists. Thank you in advance.

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• Cisco Catalyst 4500 Policy Based Routing

  - by Logan

  In order to test a new firewall I just set up I'm trying to implement policy based routing on our core switch. I want traffic from certain vlans to be routed to the new firewall while everything else continues being routed through the old firewall. I was trying to use this guide. Everything from that guide works fine except trying to run the "ip policy route-map" command in the interface configuration mode. IOS is telling me that such a command doesn't exist. A "show ip interface vlan" command says that policy routing is disabled. Any ideas? Output of "show ver": Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASEK9-M), Version 12.2(53)SG, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Thu 16-Jul-09 19:49 by prod_rel_team Image text-base: 0x10000000, data-base: 0x11D1E3CC ROM: 12.2(31r)SG2 Dagobah Revision 226, Swamp Revision 34 RTTMCB2223-1 uptime is 3 years, 22 weeks, 2 days, 19 hours, 28 minutes Uptime for this control processor is 51 weeks, 2 days, 18 hours, 2 minutes System returned to ROM by power-on System restarted at 19:22:02 UTC Tue Jul 12 2011 System image file is "bootflash:cat4500-ipbasek9-mz.122-53.sg.bin" ... cisco WS-C4510R (MPC8245) processor (revision 4) with 524288K bytes of memory. Processor board ID FOX103703W3 MPC8245 CPU at 400Mhz, Supervisor V Last reset from PowerUp 42 Virtual Ethernet interfaces 244 Gigabit Ethernet interfaces 511K bytes of non-volatile configuration memory. Configuration register is 0x2

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• Identifying Hard Drive as performance bottleneck for desktop machines

  - by Programming Hero

  I'm working in a development team where we all use laptops so we can work in multiple locations. These laptops are proving notoriously slow for development work, but at a glance they all look to have the specification for a much faster experience: CPU - Intel Core 2 Duo T7500 Memory - 2GB of RAM We all experience the biggest delays when the hard-drives are being accessed, particularly when swap-files are being thrashed. After doing a little bit of profile, a colleague discovered that our HDDs are seeing Read/Write speeds of about 10MB/sec. This seems abnormally low and we believe it the cause of the problem. Sensibly (though somewhat annoyingly) our business wont blow money on faster drives just to see if it fixes the problem; we need to illustrate this is definitely the problem and that buying some solid-state drives will make it go away. I need some way of showing how 90% of the system resources aren't being used over the course of a day, and that whenever there is utilization, it's all in HDD reads or writes. Are there any tools I could use to provide this information? Does it seem likely the problem is going to be fixed by a faster drive? Should I be looking for alternatives?

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• How to uninstall files and software from a Solid State Drive (SSD)

  - by jasondavis

  I am using a SSD drive just as a main Operation system and software drive. I have a regular spinning disk for data files. I have read that files are not REALLY deleted from a SSD drive when you "delete" them. So here is my situation and hopefully I can get some good advice. Let's say I have Windows 7 Pro x64bit installed on my 80gb Intel SSD. I then have Adobe Photoshop CS4 installed along with 50 other programs installed onto this SSD. I then decide I am done with Adobe Phjotoshop CS4 and want to remove it. I then decide I want to install another version of Adobe Photoshop and a few other software titles. Would I just do the usual, add/remove software from the windows control panel. Or if the software being removed has an "Uninstall" program to run, then run it and uninstall the software? I realize that all this WILL remove the software from Windows 7 but I am wanting to know if there is additional steps that should be taken since it is a solid state drive (SSD)?

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• The bottlenecks of any computer, what to look for?

  - by WebDevHobo

  Whether it is a laptop or a desktop, any computer is made up of several pieces of hardware that communicate with each other. Sending data back and forth to ensure that the user gets the desired results. I have seen some theoretical stuff on computers & hardware, but I wonder how it all comes together. CPU RAM Graphics Card L1 CACHE L2 CACHE L3 CACHE FSB ... And all other things. Which is the biggest bottle neck? Why would a person not want/need a big value in one of those categories in certain situations? P.S.: when reading the specs of the i5 750 processor, I came across this description: In place of the FSB, one or more high speed, point-to-point buses called Quick Path Interconnect (QPI) are used, formerly known as Common Serial Interconnect Bus or CSI. QPI features higher bandwidth than the traditional FSB and is better suited to system scaling. What is this, and how does it compare to FSB? EDIT: I am not planning to buy a computer at all. The goal of this question is to understand the internal relation of various hardware pieces, their specific functions and how they work together. For instance, I have heard to a somewhat higher-than-usual amount of L2/L3 Cache can help speed up your computer. What's up with saying that? Also I forgot to mention Hard-disk RPM.

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• ASA Slow IPSec Performance with Inconsistent Window Size

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremely poor performance when traffic passes over the IPSec VPN. CPU on the devices is ~13%, Memory at 408 MB, and active VPN sessions 2. The load on both of the the devices is particularly low. Latency between the two sites is ~40ms. Screenshot of wireshark file transfer between the two hosts over the firewall IPSec VPN performing at 10MBPS. Note the changing window size. http://imgur.com/wGTB8Cr Screenshot of wireshark file transfer between the two hosts over the firewall not going over IPSec performing at 55MBPS. Constant window size. http://imgur.com/EU23W1e I'm showing an inconsistent window size when transferring over the IPSec VPN ranging in 46,796 to 65535. When performing at 55+MBPS, the window size is consistently 65,535. Does this show a problem in my configuration of the IPSec VPN in the ASA or a Layer1/2 issue? Using ping xxxxxx -f -l I finally get a non-fragment at 1418 bytes so 1418+28 for IP/ICMP headers = 1446. I know that I have 1500 set on the ASA and Ethernet. I do have "Force Maximum segment size for TCP proxy connection to be" "1380" bytes set under Configuration Advanced TCP Options on the ASA. Using IPERF, I am getting a "TCP Window Full" every few seconds and ~3 MBPS performance. http://imgur.com/elRlMpY Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• Attempting to bootstrap and getting weird errors

  - by miah

  I'm on a new computer(mac 10.9.2) and I am attempting to bootstrap my companies project, but setuptools is failing. I can run python bootstrap.py, which creates the ./bin/buildout, but when I run the buildout, it returns the following error: Traceback (most recent call last): File "./bin/buildout", line 17, in <module> import zc.buildout.buildout File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/buildout.py", line 40, in <module> import zc.buildout.download File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/download.py", line 20, in <module> from zc.buildout.easy_install import realpath File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/easy_install.py", line 29, in <module> import setuptools.archive_util File "build/bdist.macosx-10.9-intel/egg/setuptools/archive_util.py", line 15, in <module> ImportError: cannot import name ContextualZipFile I've attempted installing it via https://pypi.python.org/pypi/setuptools#unix-including-mac-os-x-curl and homebrew.

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• ESX 4.0 space: DASD, NAS, or ?

  - by thormj

  I put together an ESX box for better management, but its performance is a WTF item; I'm a noob at dealing with ESX, so I'm looking for a laundry-list of reading material to help me straighten this out so I can go back to .NET programming. Current storage system: We're running Raid5+Hotspare (8x500 GB spindles) on a PERC6i on a Dell 2910. Due to ESX limitatios, the PERC is showing the storage as 1x2TB + 1x800GB "partitions." I'm not sure of the setup's configuration (stride / stripe / ???) at all. Our Applications We have a SBS server as well as a minor (2x50 GB, but growing at 10GB/month) database server... Our application that lives on the database VM is CPU and I/O insense; it's a database churning excercise mixed in with a lot of computation on the data (fixing that performance is what I'm supposed to be working on)... Perfomance Issue When I do a backup, restore, or worse (copy a backup from 1 vm to another to move it to the QA VM), the entire system slows to a crawl (even "unrelated" VMs). I originally thought a DASD situation would be quite good since you had PCI-x bandwidth, but the systemwide slowdown is killing productivity. Questions What should I do to make an intelligent decision about NAS vs RAID vs SAN vs DASD? Are there sweet spots/ugly spots in the storage setup? Can you use a SSD PCI-X card in ESX for the tempdb? Good/Bad idea? Is there any way to "share" some image in a copy-on-write fashion? Most of the "Backup-Copy-Restore" is to "put a clean image on the dev boxes"; if I could have them "share" the master image, the "big copy" (2x50 GB) would only need to be done once per week instead of once per dev per week...[runtime performance isn't a concern with the dev boxes, but the backup/copy/restore kills production, SBS, and everything else on the box]

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• Git fails to push with error 'out of memory'

  - by jwir3

  I'm using gitosis on a server that has a low amount of memory, specifically around 512 MB. When I try to push a large folder (happens to be a backup from an android phone), I get: me@corellia:~/Configs/$ git push origin master Counting objects: 18, done. Delta compression using up to 8 threads. Compressing objects: 100% (14/14), done. fatal: Out of memory, malloc failed MiB | 685 KiB/s error: pack-objects died of signal 13 error: failed to push some refs to 'git@dagobah:Configs' I've been searching the web, and notably found: http://www.mail-archive.com/[email protected]/msg01747.html as well as http://git.661346.n2.nabble.com/Out-of-memory-error-during-git-push-td5443705.html but these don't seem to help me for two reasons: 1) I am not actually out of memory when I push. When I run 'top' during the push, I get: 24262 git 18 0 16204 6084 1096 S 2 1.2 0:00.12 git-unpack-obje Also, during the push if I run /head/meminfo, I get: MemTotal: 524288 kB MemFree: 289408 kB Buffers: 0 kB Cached: 0 kB SwapCached: 0 kB Active: 0 kB Inactive: 0 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 524288 kB So, it seems that I have enough memory free, but it's actually still failing, and I'm not enough of a git guru to figure out what is happening. I would appreciate it if someone could give me a hand here and tell me what could be causing this problem, and what I can do to solve it. Thanks! EDIT: The output of running the ulimit -a command: scottj@dagobah:~$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 204800 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 204800 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

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