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• Cannot install CentOS 6.5 using UEFI usb boot

  - by Vaindil

  I am trying to dual-boot CentOS 6.5 on my desktop that is currently running Windows 8.1. I have two storage devices: an SSD that has my Windows installation, and an HDD that has all of my data. Both are formatted using GPT, and Windows boots using UEFI. I used the CentOS 6.5 live DVD (CentOS-6.5-x86_64-LiveDVD.iso) to create an EFI-bootable flash drive (it does boot properly in EFI mode). I receive an error, however, when CentOS is booting (error is below). I have a 6.4 boot DVD which boots as expected, but it does not boot in UEFI mode and therefore doesn't play nicely with my Windows installation (I have no way to access it, even using rEFInd or any other similar tools). What do I need to do to get the device to boot properly in UEFI mode? Kernel panic - not syncing: Attempted to kill init! Pid: 1, comm: init Not tainted 2.6.32-431.el6.x86_64 #1 Call Trace: [<ffffffff815271fa>] ? panic+0xa7/0x16f [<ffffffff81077622>] ? do_exit+0x862/0x870 [<ffffffff8118a865>] ? fput+0x25/0x30 [<ffffffff81077688>] ? do_group_exit+0x58/0xd0 [<ffffffff81077717>] ? sys_exit_group+0x17/0x20 [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b drm_kms_helper: panic occurred, switching back to text console

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• Troubleshooting a Windows 7 PC that wouldn't sleep

  - by NPE

  I have a new Windows 7 PC that wouldn't sleep (not just automatically, but also when specifically told to). The screen goes black momentarily, but within two seconds the machine comes back as if nothing has happened. I tried powercfg energy. This produces some errors quoted at the bottom of this post, plus some warnings about timer resolution. There are no USB devices connected other than wireless keyboard + mouse (Logitech MK250); I tried unplugging them to no effect. The motherboard is Asus P7P55D-E. powercfg lastwake says "Wake History Count - 0", which I take to mean that it never actually went to sleep. I dual boot into Ubuntu, and was having exactly the same problem on the Linux side. That turned out to do with USB 3.0, which I've now disabled in the BIOS. This has solved the problem on the Ubuntu side of things, but made no difference to Windows 7. Any suggestions? Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name Generic USB Hub Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_8087&PID_0020 Port Path 1 USB Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name USB Root Hub Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_8086&PID_3B34 Port Path USB Suspend:USB Device not Entering Suspend The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use. Device Name USB Composite Device Host Controller ID PCI\VEN_8086&DEV_3B34 Host Controller Location PCI bus 0, device 29, function 0 Device ID USB\VID_046D&PID_C52E Port Path 1,8

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• Virtual machines with failover setup

  - by kimmmo

  We have three servers and our plan is to run a number of virtual machines on them in such manner, that if one of the nodes blow up, we can either quickly or seamlessly get a spare running on another node. In addition to the normal networking, they're interconnected via dual 10Gbit NIC's, so networked raid/mirroring shouldn't be a problem. The guest VM's are mostly going to be running text mode linux, but of course it wouldn't hurt to be able to spin up a non-mission critical windows guest for running Visual Studio or checking IE compatibility of a web app. We've spent some time trying to get some magical cloud setup running using Stackops and Crowbar but it started to look like they were offering way too much and were too complicated for our needs. The next candidate, I think, is Ubuntu 11.04 server + KVM + Ganeti + Drbd, unless you can come up with a suggestion for a better solution that we have missed. Requirements: Installation should be simple or at least understandable without being in the dev team A browser interface for creating and managing VM's is a nice bonus Single node's hardware failure should cause minimal downtime for VM's that were running on that node Adding more nodes should be possible without shutting down the VM's.

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• mysql INNODB inserts very slow

  - by 133794m3r

  The database's schema is as follows. CREATE TABLE `items` ( `id` mediumint( 8 ) unsigned NOT NULL AUTO_INCREMENT , `name` varchar( 45 ) NOT NULL , `main_type` tinyint( 4 ) NOT NULL , `rarity` tinyint( 4 ) NOT NULL , `stack_size` smallint( 6 ) NOT NULL , `sub_type` tinyint( 4 ) NOT NULL , `cost` mediumint( 8 ) unsigned NOT NULL , `ilvl` smallint( 6 ) unsigned NOT NULL DEFAULT '0', `flavor_text` varchar( 250 ) NOT NULL , `rlvl` tinyint( 3 ) unsigned NOT NULL , `final` tinyint( 4 ) NOT NULL DEFAULT '0', PRIMARY KEY ( `id` ) ) ENGINE = InnoDB DEFAULT CHARSET = ascii; Now, doing an insert on this table takes 0.22 seconds. I don't know why it's taking so long to do a single row insert. Reads are really really fast something like 0.005 seconds. With using the example configuration from here dev mysql innodb it averages ~0.002 to ~0.005 seconds. Why it takes more than 100x more time to do a single insert makes no sense to me. My computer is as follows. OS:Debian Sid x86-x64, Mysql 5.1, RAM:4GB ddr2, cpu 2.0Ghz dual core, HDD 7200RPM 32MB cache 640GB. Why it's taking almost 100x as much time for a SELECT * FROM items; vs INSERT INTO items ...; will never make any sense to me. It's still a small table at only 70 rows, and took that long even when it had 0 rows.

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• ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

  - by Florian Kruse

  I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with 11 HDDs (250 GB) and one SSD (OCZ Vertex 2 100 GB) We want to evaluate the use of a L2ARC, so the current ZPOOL is: $ zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM afstank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c11t0d0 ONLINE 0 0 0 c11t1d0 ONLINE 0 0 0 c11t2d0 ONLINE 0 0 0 c11t3d0 ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c13t0d0 ONLINE 0 0 0 c13t1d0 ONLINE 0 0 0 c13t2d0 ONLINE 0 0 0 c13t3d0 ONLINE 0 0 0 cache c14t3d0 ONLINE 0 0 0 where c14t3d0 is the SSD (of course). We run IO tests with bonnie++ 1.03d, size is set to 200 GB (-s 200g) so that the test sample will never be completely in ARC/L2ARC. The results without SSD are (average values over several runs which show no differences) write_chr write_blk rewrite read_chr read_blk random seeks 101.998 kB/s 214.258 kB/s 96.673 kB/s 77.702 kB/s 254.695 kB/s 900 /s With SSD it becomes interesting. My assumption was that the results should be in worst case at least the same. While write/read/rewrite rates are not different, the random seek rate differs significantly between individual bonnie++ runs (between 188 /s and 1333 /s so far), average is 548 +- 200 /s, so below the value w/o SSD. So, my questions are mainly: Why do the random seek rates differ so much? If the seeks are really random, they should not differ much (my assumption). So, even if the SSD is impairing the performance it should be the same in each bonnie++ run. Why is the random seek performance worse in most of the bonnie++ runs? I would assume that some part of the bonnie++ data is in the L2ARC and random seeks on this data performs better while random seeks on other data just performs similarly like before.

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• MD RAID 1 with external bitmap doesn't fully resync

  - by user64744

  I have an interesting configuration: dual boot system with a RAID 1 that needs to be visible in both Windows and Linux. The Windows install is Win 7 Enterprise, and the Linux install is Kubuntu 10.04. To get the RAID to work, I set it up using Windows's "Dynamic Disks" RAID 1, and brought it up in Linux using MD with no persistent superblock, and a write-intent bitmap on another partition. (Without this bitmap, MD had no way of knowing that the array was in sync, and would do a complete resync every time the array started.) The array is assembled like so: mdadm --build /dev/md1 -l 1 -n 2 -b /var/local/md1.bitmap /dev/sdb2 /dev/sdc2 I expected that the first time I ran this command, it would resync the array, write out a bitmap with no dirty chunks, and all would be good. This wasn't the case: after completing the resync, the bitmap was mostly clean, but about 5% dirty blocks remained, as revealed by mdadm -X /var/local/md1.bitmap I didn't mount the filesystem on /dev/md1 or touch it in any other way. I then found that stopping and restarting the array: mdadm --stop /dev/md1 mdadm --build /dev/md1 -l 1 -n 2 -b /var/local/md1.bitmap /dev/sdb2 /dev/sdc2 did indeed read in the bitmap, with an ensuing resync that went quickly because most of the blocks were marked clean. The confusing part is that this resync further reduced the number of dirty blocks, but still did not remove all of them. By repeatedly stopping and restarting I could slowly bring the dirty block count down to around 0.6%, where it seemed to level out. Any ideas what could be causing this? It smells to me of a race condition somewhere that leads to blocks either being skipped over during synchronization or not properly cleared from the bitmap, but I really have no evidence to prove this. It doesn't look like hardware issues since both drives are new and have zero read errors and reallocated sectors reported by smartctl -a.

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• Should I partition a 1TB Hard Disk whose primary use is media storage?

  - by Senthil

  I am going to get a 1TB hard disk. I will be storing 1080p or 720p movies, high-bitrate music and pictures in it. I use my PC 90% of the time only to play/listen/see those. I am running out of space in my current HD so I am getting another one. My specs are 2.7GHz Dual Core, 512MB GeForce 9400GT, 2GB DDR2 RAM and all the proper matroska codecs/players. I guess that is enough to play 1080p movies withough a glitch, given an ideal hard disk. I've read about proper partitioning giving performance improvement etc.. I don't want my hard disk to be the bottleneck. Can someone tell me whether I should partition my 1TB hard disk into many drives? If I should, what is the ideal size of each partition? Smooth playing of movies is very important to me. Once I start filling up the disk, there is no turning back. So I want to get it right before I start. Thanks.

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• How to edit known_hosts when several hosts share the same IP and DNS name?

  - by Frédéric Grosshans

  I regularly ssh into a computer which is a dual-boot OS X / Linux computer. The two OS instance do not share the same host key, so they can be seen as two host sharing the same IP and DNS. Let's say the IP is 192.168.0.9, and the names are hostname and hostname.domainname As far as I understood, the solution to be able to connect to the two host is to add them both to the ~/.ssh/know_hosts file. However, it is easier said than done, because the file is hashed, and has probably several entries per host (192.168.0.9, hostname, hostname.domainname). As a consequence, I have the following warning Warning: the ECDSA host key for 'hostname' differs from the key for the IP address '192.168.0.9' Is there an easy way to edit the known_hosts file, while keeping the hashes. For example, how can I find the lines corresponding to a given hostame? How can I generate the hashes for some known hosts? The ideal solution would allow me to connect to seamlessly to this computer with ssh, no matter whether I call it 192.168.0.9, hostname or hostname.domainname, nor if it uses its Linux hostkey or its OSX hostkey. However, I still want to receive a warning if there is a real man-in-the middle attack, i.e. if another key than these two is used.

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• Home Server: cpu virtualisation, what to choose?

  - by Huygens

  I'm looking for virtualisation solutions for storage and OS for a home server. A sort of private cloud where I manage the storage space independently of the VM one. This question focus on VM (or compute instance) management and what would best suit my needs. (I have another question related to the storage management). My use cases are: A backup server: rsync and other services running. A personal cloud server: a kind of owned dropbox system, à la ownCloud. " users foreseen. A media server: streaming videos and displaying photos. Here my environement and wishes: Server: HP Proliant MicroServer with 8 GB RAM (AMD Turion dual core with AMD-V technology) OS types: only Linux (perhaps a *BSD VM in the future) Linux distributions do not matter, I'm familiar with RHEL, Fedora, Suse, Ubuntu, but any other recommandation will be fine 2-3 VMs foreseen: backup server, owncloud server and media server (optional). Those are only servers, so no graphical console needed (I don't need VirtualBox) By VM I mean a virtualised environment like KVM, Xen, etc. or a compute instance like with OpenStack storage should be "virtualised/cloudified" see my other question. VM should be able to be migrated to another server in the future if performance cannot be fullfilled anymore by the current server It does not matter if installation of such setup is complicated as long as management tools allow for easy maintenance I don't have Windows at home, so solution should be Linux friendly and would be nice to be web based. But native apps are OK too. System should be easy to enhance: by adding a new server to migate some of the VMs to it. So it's really a kind of private cloud on which I could run some Linux OS. I would prefer free (libre, as in a free speach) and open source tools. But it does not have to be free as in a free beer. So Xen, KVM, VitualBox or OpenStack? What would you recommend?

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• What laptop would be recommended for video-editing or transcoding to blu-ray?

  - by Rob

  I'm looking for a machine (has to be a laptop) reasonably fast enough to handle editing/transcoding/rendering to Blu-ray disc of full true HD 1080p (1920x1080) video from a Samsung R10 camcorder - MPEG4 25fps (not the Sony-Panasonic AVCHD format): To be able to browse through the footage (say, quarter screen is fine for monitoring) and do simple edits - cut out bad bits, add titles, fades, nothing too fancy To be able to burn the footage in 1920x1080p 24p (twenty-four) fps to blu-ray, probably don't mind if I have to leave it for a few hours, or even overnight, as long as its not still running in the morning or takes days. I ALREADY have an external USB 2.0 LG BE06LU10 blu-ray burner. Does quad core make much difference? Or would Dual-core suffice for the above? NVidia because of CUDA for increased speed. What software today can take advantage of this? Which graphics card do I need? So far I've found Dell/Alienware to be well-specified, having a 5yr old Dell laptop that still runs well, albeit slow by today's standards, gives me a good impression. My concerns are too much fan-noise and budget and some Dell Precision Laptops exceed 1500 pounds. Thoughts?

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• Are These Parts compatible?

  - by ell

  I have never assembled a PC before, although I have taken an old one apart and replaced a few parts in others here and there so I have (very) limited experience. I have been looking to make a pc and here are the parts I might buy: Foxconn P45AL Intel P45 (Socket 775) DDR2 Motherboard (with onboard sound I believe) Gigabyte GeForce GTX 460 OC 768MB GDDR5 PCI-Express Graphics Card Already have 2 1gb sticks of dual channel DDR2 memory Intel Core 2 Quad Q8400 LGA775 'Yorkfield' 2.66GHz 4MB-cache Processor Samsung SpinPoint F3 1TB SATA-II 32MB Cache Hard Drive Antec Dark Fleet Series DF10 Gaming Enclosure – Black I already have monitor, mouse, keyboard and DVD/CD drive Akasa Freedom Power 1000W Modular Power Supply I have never done this before so feel free to laugh at me for getting something obvious wrong, forgetting a vital component etc. but is all of this compatible? And have I gone overkill on the PSU, if so, please recommend one. Thanks in advance, ell. EDIT: Added PSU which I forgot to mention EDIT: I would be using this to surf the internet, write e-mails, chat, word process, play games such as team fortress 2 & spring rts (at highest graphics hopefully), some 3d modelling in blender, some opengl programming, and image editing in GIMP.

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• sata hard drive failed

  - by M. Shehryar

  Dear friend, initially my dual core PC started shutdown and re-start by itself after adding 1 GB ram and up-grading the graphic card. Then refused to boot. I restored the window ghost but failed to boot. I tried to install new window but installation failed after coping the window files. tried to install old vista lonhorn. It inspected found errors, fixed them but ultimatly failed to be installed. Once again restored the ghost through acronis but failed to boot. At the end attached as slave with another pc but it was not visible. Even acronis could not see it or its partitions. Only bios can see it. It seems that no file system is available on the drive. My data on drive is very important. Please help me how to revover my data. Drive brand is Samsung, cap is 160 GB and file system was NTFS.

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• sata hard drive failed

  - by M. Shehryar

  Dear friend, initially my dual core PC started shutdown and re-start by itself after adding 1 GB ram and up-grading the graphic card. Then refused to boot. I restored the window ghost but failed to boot. I tried to install new window but installation failed after coping the window files. tried to install old vista lonhorn. It inspected found errors, fixed them but ultimatly failed to be installed. Once again restored the ghost through acronis but failed to boot. At the end attached as slave with another pc but it was not visible. Even acronis could not see it or its partitions. Only bios can see it. It seems that no file system is available on the drive. My data on drive is very important. Please help me how to revover my data. Drive brand is Samsung, cap is 160 GB and file system was NTFS.

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• Monitor displays at 1024x768; scrolls screen for higher resolutions

  - by Matt

  I have a dual monitor setup. Normally, they both display at 1680x1050. They have been setup this way for about a year. I'm using Windows XP Professional 2003 x64 SP2. Today, out of nowhere, one of the monitors kicked back to a lower resolution. I was not playing with any configuration at the time.. in fact all I had done was close a window (maybe a browser). But the thing is that the resolution is still preserved partially by the fact that the screen will scroll when you move the mouse. So it's like looking through a 1024x768 window into a 1680x1050 world. The monitor itself does not appear to be damaged, because I also have it connected to my netbook (via KVM) and higher resolutions work fine. I tried uninstalling/reinstalling the drivers to no avail. System restore doesn't help either. I'm unsure of the exact ATI card I'm using.. Device Manager lists it as "Radeon X300/X550/X1050". There is no Catalyst Control Center software installed. I tried to install it, but there doesn't seem to be a way to install it by itself ... it forces you to install another driver, which breaks both of my displays, forcing me to go into safe mode and run system restore again. Any ideas? Thanks

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• How to best tune my SAN/Initiators for best performance?

  - by Disco

  Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results. I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K. The MD3600 has 2 RAID controllers, each has 2x 10GbE ethernet nics. There's nothing else on the switch; one VLAN for SAN traffic. Here's my multipath.conf defaults { udev_dir /dev polling_interval 5 selector "round-robin 0" path_grouping_policy multibus getuid_callout "/sbin/scsi_id -g -u -s /block/%n" prio_callout none path_checker readsector0 rr_min_io 100 max_fds 8192 rr_weight priorities failback immediate no_path_retry fail user_friendly_names yes # prio rdac } blacklist { device { vendor "*" product "Universal Xport" } # devnode "^sd[a-z]" } devices { device { vendor "DELL" product "MD36xxi" path_grouping_policy group_by_prio prio rdac # polling_interval 5 path_checker rdac path_selector "round-robin 0" hardware_handler "1 rdac" failback immediate features "2 pg_init_retries 50" no_path_retry 30 rr_min_io 100 prio_callout "/sbin/mpath_prio_rdac /dev/%n" } } And iscsid.conf : node.startup = automatic node.session.timeo.replacement_timeout = 15 node.conn[0].timeo.login_timeout = 15 node.conn[0].timeo.logout_timeout = 15 node.conn[0].timeo.noop_out_interval = 5 node.conn[0].timeo.noop_out_timeout = 10 node.session.iscsi.InitialR2T = No node.session.iscsi.ImmediateData = Yes node.session.iscsi.FirstBurstLength = 262144 node.session.iscsi.MaxBurstLength = 16776192 node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144 After my tests; i can barely come to 200 Mb/s read/write. Should I expect more than that ? Providing it has dual 10 GbE my thoughts where to come around the 400 Mb/s. Any ideas ? Guidelines ? Troubleshooting tips ?

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• Get Illegal Instruction error when booting Linux in VirtualBox, works fine when booted directly

  - by rkjnsn

  I have a computer on which I am dual booting Windows 7 and Gentoo Linux (both 64-bit). I want to be able to load up my Linux installation in a VM while I am booted into Windows. I have installed VirtualBox and followed the instructions for creating a raw disk VMDK. When I start the VM, Linux starts booting, but then fails with the following error when unlocking my root partition: truecrypt[441] trap invalid opcode ip:373615538e0 sp:3dd0e0dfb60 error:0 in libpixman-1.so.0[373614d6000+8d000] Everything works fine when I boot into Linux directly. What could cause an illegal instruction to be hit in libpixman only when booting in VirtualBox? Update: As a troubleshooting step, I recompiled pixman without "-march", and no longer get an illegal instruction error in that library. (The boot fails in the same spot with the same error in a different library, however.) How can I determine the specific opcode that isn't working in VirtualBox so I can disable it in my CFLAGS without having to disable all CPU-specific optimizations? I am still confused as to why there would be any user-mode instruction that would fail to work in a VM. Is this a known limitation? My CPU is an Intel Core i7 3720QM, and I have hardware virtualization support enabled.

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• GA 8KNXP Rev1.0: 4GB installed, only 3.5 recognized by BIOS

  - by hurikhan77

  I've installed 2x 1 GB and 4x 512 MB memory into my GA-8KNXP system which would sum up to 4GB. The specs from the manual say: Maximum memory support: 4GB. If all six slots are utilized, slot 5+6 may only equipped with single-sided RAM modules. And so I did. Anyway: The BIOS counts up to 3.5 GB and finishes there. Also my linux system reports only 3.5 GB of memory although 4 GB memory support is activated in the kernel. So I suppose this is a memory mapping issue or a hardware issue. I've tried removing only on of the 512 MB memory modules leaving 5 modules in place. But that just stopped the system from powering on correctly (screen stays black although fans and leds come to live). Dual Channel was detected and enabled so the system technically found all 6 modules. "dmidecode" in linux reports only memory in slots 1 to 4 and ignores slots 5+6, so it only detects 3 GB of memory. It also says the system would support up to 16 GB of memory with 4 GB modules per slot. I think technically the chipset should be able to offer and utilize the complete 4 GB memory range. Any clues what else I could check? Or do I have just to live with 0.5 GB wasted memory?

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• Getting Dell E6320 with I7 to work with 3 monitors at 1920x1080p x 3

  - by MadBoy

  I want to buy Dell E6320 which comes with Intel Core I7-2620M (2.70GHz, 4MB cache, Dual Core) with Intel HD Graphics 3000. Laptop will come with docking station. I want to connect 3 monitors to that docking station so that working at home would give me some additional boost. Docking station will allow me to connect only 2 monitors so I'm looking at following other options: Matrox TRIPLEHEAD2GO DIGITAL Edition or TRIPLEHEAD2GO DP Edition. But reading Matrox Support Page intel GPU can't run the highest resolution with 3 monitors connected, it even gets worse since it seems monitors would have to be able to work at 50hz. Also I'm not sure but it seems that Matrox doesn't split the monitors as 3 separate monitors but simply as one big space (which is a bit opposite to what I need) Buy 2 or maybe just 1 USB based monitor but it would also mean having 1 or 2 different monitors then the main one, unless I buy 3 USB based monitors which would mean more money to spend. Also I found only couple of models and most of them require USB 3.0 and no other cables to plug in (nice but costly - couldn't find decent monitor with only USB for sending signal and having power connected normally) . But docking station has only one USB 3.0 port. Can I use hub and still get it to work? Find some converters from Digital to USB (I think DisplayLink does some?) Buy different laptop but what kind? I need it to be I7, small (13"), fast and lightweight. At same time it requires docking station that I can use at home to connect 3 external monitors. Some other suggested solution... Edit: I need 3 monitors for work in terms of coding in Visual Studio or having word/excel/outlook open. Nothing fancy. Maybe some movie once in a while.

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• DNS failover in a two datacenter scenario

  - by wanson

  I'm trying to implement a low-cost solution for website high availability. I'm looking for the downsides of the following scenario: I have two servers with the same configuration, content, mysql replication (dual-master). They are in different datacenters - let's call them serverA and serverB. Users use serverA - serverB is more like a backup. Now, I want to use DNS failover, to switch users from serverA to serverB when serverA goes down. My idea is that I setup DNS servers (bind/powerdns) on serverA and serverB - let's call them ns1.website.com and ns2.website.com (assuming I own website.com). Then I configure my domain to use them as its nameservers. Both DNS servers will return serverA IP as my website's IP. If serverA goes down I can (either manually or automatically from serverB) change configuration of serverB's DNS, to return IP of serverB as website's IP. Of course the TTL will be low, as it's supposed to be in DNS failovers. I know that it may take some time to switch to serverB (DNS ttl, time to detect serverA failure, serverB DNS reconfiguration etc), and that some small part of users won't use serverB anyway. And I'm OK with that. But what are other downsides of such an approach? An alternative scenario is that ns1.website.com will return serverA IP as website's IP, and ns2.website.com will return serverB IP as website's IP. But AFAIK clients not always use primary nameserver and sometimes would use secondary one. So some small part of users would use serverB instead of serverA which is not quite what I'd like. Can you confirm that DNS clients behave like that and can you tell what percentage of clients would possibly use serverB instead of serverA (statistically)? This one also has the downside that when serverA goes back up, it will be automatically used as website's primary server, which is also a bad situation (cold cache, mysql replication could fail in the meantime etc). So I'm adding it only as a theoretical alternative. I was thinking about using some professional DNS failover companies but they charge for the number of DNS requests and the fees are very high (why?)

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• bootmgr image is corrupt

  - by bacord

  I just replaced my HD with a SSD. I did a brand new install on the SSD and I received the following error after booting BOOTMGR image is corrupt. The system cannot boot. A little configuration for your knowledge. The system used to be a dual boot with XP & windows 7. After replacing the original startup HD with my SSD I changed a setting in the bios to AHCI (I have tested changing it back but this did not help). When I look at the stats on the drive in the bios, it claims that the SSD is in a raid configuration despite the settings not being configured that way. Related System Information: Intel 320 Series 80 GB Sata II SSD JetWay JPA78VM3-H-LF AM2+/AM2 AMD 780V HDMI Micro ATX AMD Motherboard AMD Athlon 64 X2 7 GB ram I have performed 2 fresh installs to no avail. Also, followed this guide and performed option 1 and 2. I have done bootsec/fixmbr and /fixboot. So.. any suggestions?

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• Computer does not boot after ram upgrade

  - by Calmarius

  I have a Dell Optiplex GX520 desktop (it's abount 5 yr old) PC with 512 MB DDR2 RAM. Since my computer always swapping I thought I should upgrade my RAM. I bought a Kingmax 2GB DDR2 RAM. But my system does not boot. The status leds are on 2 and 4. The user manual says 'video card failure' wtf? I put back the original module and everything works. I tried many combinations. When I leave the old 512 RAM in and put the 2GB next to it to the other socket my system completes the POST and I'm able to enter the BIOS menu. It says my system has 2.5 GB installed, one 0.5GB and one 2GB in dual asymmetric channel mode. It's seemingly right. Exiting the BIOS setup GRUB loads successfully, but when I try to boot Ubuntu it crashes with kernel panic immediately. Trying to load Windows XP does not get past the loading screen, it crashes with 0x8E stop error. Does this mean the ram I bought is faulty? Or is it just mean that the memory module I bought is too new to be handled my computer? I this case I may exchange the RAM with my friends. No other computer is in my house (my very old box has DDR1 ram, my systers new box has DDR3 ones. I can't plug my memory in neither one.) I'm going to return the RAM to store to replace it with a better one tomorrow. Is there any hope to get this new module work?

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• 2560 x 1600 screen resolution not available when a second monitor is attached.

  - by sgmoore

  I am running Windows 7 (64-bit edition) and have a 30" Dell 3007WFP monitor which runs at a screen resolution of 2560 x 1600. This works perfectly until I try to connect a second monitor, and then the screen resolution on the main monitor immediately drops to 1280x800 and I can't change it back up to the correct resolution until I disconnect the second monitor. The graphics card is a Nvidia Quadro FX 370. This has a dual link DVI connector (to which the 30" is connected) and a single link DVI connector. The second monitor can run at 1920x1080 and is connected using a VGA to DVI connector. Note, it does not seem to matter whether the second monitor is running at 1920x1080 or even at 800x600. Windows reports Total Available Graphics Memory: 3839MB Dedicated Video Memory: 256MB System Video Memory: 0MB Shared System Memory: 3583MB Does anyone know if this a limitation with the video card, memory, drivers, connectors or something else? If this is a limitation with the video card, can anyone recommend a PCI Express 16 card that would support at least this setup, but preferably support two 30" monitors both running 2560 x 1600. (I'm not into gaming etc, so it doesn't need to be very powerful)

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• How can I control which sound card Ubuntu uses for playback?

  - by GorillaSandwich

  I am dual-booting Ubuntu 9.04 and Windows XP but am new to Ubuntu. In Windows, I use an M-Audio Audiophile 2496 sound card for recording (because it has RCA input jacks for my mixer), but I don't use it for playback (because my speakers use a 1/8 inch jack); instead, I use the motherboard's built-in sound card. I tried to recreate this arrangement in Ubuntu, but despite selecting the built-in card for all playback under System > Preferences > Sound, I still have inconsistent results. Rhythmbox plays back through the integrated card, but Flash content in the browser and games in the OS send their audio to the Audiophile card. I have seen recommendations to use a program called "Jack" to control this, but I installed it and found it baffling. How can I control which card is used for playback, other than disabling one card (as I discovered how to do and explain below)? Also, is there a GUI for disabling hardware, or is it necessary to edit a configuration file?

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• WWNs,WWPNs and Fibre Channel addresses

  - by user238230

  Lots of contradictory on these subjects and I don't know why. My first question is about the 64 bit WWN. One reference claims the terms WWN and WWPN are synonymous. An online source seems to refute this. They say: A WWPN (world wide port name) is the unique identifier for a fibre channel port where a WWN (world wide name) the unique identifier for the node itself. A good example is a dual port HBA. There will be two WWPN's (one for each port) and only a single WWN for the card itself. Question #1: Which is correct? I’m almost positive I read that every “Port” has a WWN. My next question is about the 24 bit FC address that is dynamically allocated to a port when it is introduced to the switch. The Domain ID field is defined as: "a unique number provided to each switch in the fabric." Question #2: Do Domain IDs only apply to switch ports? For example what would the Domain ID be for a HBA? None? The same as the switch port it is connected to? Question #3: My last question is about the Name Server of a switch. A book example shows the routing of a message through the switch. It uses the WWNs of the source and destination ports to route the message. I am assuming that the Name Server must associate the WWN and the FC address in some way in order to route the message, correct?

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• Daisy-chainable DisplayPort Monitors

  - by thepurplepixel

  I am the proud new owner of a MacBook Pro with a mini-DisplayPort. My desk setup used to allow me to position the screen of my old MacBook beside an external monitor, essentially allowing dual-head. It was also advantageous that my old MBP and my external monitor had the same resolution, 1440x900. Now, I'm searching for a set of two monitors that I can use a HengeDock with. Unfortunately, the MacBook Pro suffers from having only one mini-DisplayPort. Looking up the spec for DisplayPort 1.2 (which the MBP supports), DisplayPort daisy chaining is supported. What I'm looking for is a monitor that has two DisplayPorts so I can daisy chain two monitors off the single mini-DisplayPort. What I don't want is a USB-based video solution. I need full acceleration on both monitors; an external video card won't cut it. I hope I don't have to wait a few years for these monitors to come out. TL;DR: I need two monitors with two DisplayPorts each that I can daisy-chain. Thanks!

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