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• sata2 hdd not reported correctly on gigabyte mobo

  - by hyperboreean

  hey guys, I have a gigabyte ga-k8nmf-9 mobo which has both sata 1 and sata 2 support. Until a few hours ago I had a samsung 160gb sata 1 hdd which worked ok until it failed. I bought a wd se16 caviar, 500 gb, 7200 rpm, 16 mb cache, but it seems that it's not properly detected by my computer - it's only showing 137 GB out of 500. I tried a BIOS update (to F10e) and it's still doing the same thing. I've altered BIOS settings to use only sata (no ide) and many other settings, but nothing worked. Any help will be greatly appreciated Update on this one: it seems that the previous hdd was doing the same thing, though I didn't notice because it was approximately the same size

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• Xen Disk Performence Issues

  - by user98651

  I'm currently using Xen PV on CentOS 5 with my domU's as flat files running on a hardware RAID controlled (write cache enabled) formatted with XFS. On the dom0 I can get about 500MB/s in a 2GB dd write from /dev/zero however on the domU's I'm lucky if I get 10MB/s (it is usually around half that). I've tried changing the disk scheduling to NOOP on the domU's, changed some mount parameters and tweaked the performance allocations of both the dom0 (prioritize CPU) and domU's (increase RAM and VCPU allocations). None of these steps have produced any noticeable change in performance. My instinct here is that it is not a hardware problem, due to the solid performance of the dom0. Any ideas on what might be causing this problem? I'm considering moving to LVM based domU's.

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• nginx caching per user agent

  - by Tuinslak

  I'm currently using nginx as reverse proxy with caching enabled. However, the main site has two different layouts, depending on the user-agent (mobile or not). I've tried something similar to this: # mobile users if ($http_user_agent ~* '(iPhone|iPod|mobile|Android|2.0\ MMP|240x320|AvantGo|BlackBerry|Blazer|Cellphone|Danger|DoCoMo|Elaine/3.0|EudoraWeb|hiptop|IEMobile)') { set $iphone_request '1'; } if ($iphone_request = '1') { proxy_cache mobile; } if ($iphone_request = '') { proxy_cache site; } proxy_cache_key "$scheme://$host$request_uri"; proxy_pass http://real-site.tld; However, nginx gives an error, stating proxy_cache can't be used in an if-structure. Any other way to serve from a different cache depending on the browser? Thanks, Tuinslak

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• Server downtime - are these APC warnings the cause?

  - by DisgruntledGoat

  Yesterday I had a problem with my dedicated server (Ubuntu 10.04, LAMP). It wasn't down per se, but running incredibly slowly as if we had a massive overload of visitors (though I don't think we did). It's running smoothly again now. I've been checking through log files etc to see if I can find any issues, the only strange thing is a bunch of these errors, occurring at about the same time as the downtime: [apc-warning] Unable to allocate memory for pool. in [file] on line 49. And a bit later on: [apc-warning] GC cache entry '[file1]' (dev=2056 ino=8988092) was on gc-list for 3601 seconds in [file2] on line 746. Could these errors indicate the cause of the server slowdown, or are they simply a result of the server being slow in the first place? What would be the solution?

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• Set Thunderbird "from" address by incoming "to" address

  - by user293698

  I have configured my email server to cache all email to my mailbox. So [email protected] and [email protected] go to one mailbox. Every forum, registration, and guy get their own address for sending me emails so I can deliver it to /dev/null if anyone start spamming. That's the working setup. Now the problem: If I reply to a message, then Thunderbird always sets my default Identity as sender. I know I can add additional identities, but I don't want to add every address. How can I configure when a email is sent to [email protected], I answer with [email protected].

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• VFS and FS i-node difference

  - by gaffcz

  What is the difference between VFS i-node and FS (e.g. EXT) i-node? Is it possible that EXT i-node is persistent (contains/points to data blocks), but VFS i-node is created just in i-node cache after read/use of EXT i-node? Or the VFS i-node is just an image of FS i-node (it's the same) and i-nodes in those systems, which are not working with i-nodes (e.g. FAT, NTFS) has to be emulated (HOW?) to allow VFS work with those FS like they would support i-nodes?

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• MySQL takes forever after running certain php scripts... optimization help?

  - by DFischer

  When I run a couple scripts from the vBulletin software (like uninstalling a plugin) it takes forever. When monitoring the memory usage, it shows this = -/+ buffers/cache: 158 381 Swap: 255 10 245 It seems that MySQL is only using a certain amount and once it does it tries to use the swap instead? I have a 512MB slice and right now my key buffer is at 16M and max_allowed_packet is at 16M. Is there something else I should increase or can I increase those variables and still be safe? Thanks.

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• Linux Read-Ahead Downsides

  - by JPerkSter

  Hi Everyone, Hope all is well. I have a question regarding read-ahead caching. Are there any downsides to raising the size of the read-ahead cache? On our farm, we're currently running at 256, and upon raising that higher, we are seeing significant throughput gains.   [root@server~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 7352 MB in 2.00 seconds = 3677.62 MB/sec 3 Timing buffered disk reads: 244 MB in 3.10 seconds = 78.68 MB/sec [root@server ~]# blockdev --setra 10240 /dev/sda [root@server ~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 11452 MB in 2.00 seconds = 5728.52 MB/sec Timing buffered disk reads: 422 MB in 3.17 seconds = 133.04 MB/sec We are running on 2.6. Thanks!

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• Minimal backup for Windows 7 system recovery

  - by JIm

  There might not be an answer to this, but for a home Win7 system, what files/directories must be backed up to recover after a windows crash? I can reinstall software, and I keep data files elsewhere. When I use acronis home backup software to backup my "critical" files it seems to choose the entire partition. Updates are mostly browser cache files and the like. Or, after a crash, should I just reinstall windows. I dread the hours of windows updates that would require. Thanks.

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• How to get the spec of a machine on Linux?

  - by machinePurchaser

  I am interested in getting the spec of a machine, because I am thinking getting a similar server. What I am mostly interested in knowing is the number of cores / CPUs / etc., the amount of memory, the speed of the CPUs, the CPU cache size, and any other detail which is important for performance. My question is two-fold: Which parameters should I be interested in other than the ones I specified above? Is there an easy way to read them off the machine in Linux? cat /proc/cpuinfo reveals a lot about the CPUs, for example... What about memory (would rather not rely on top), etc?

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• Need solutions in sharing a 3Mb/768Kbps DSL line to 60+ users and faster bandwidth

  - by elistp

  Two parts. Part 1: We currently have 2 DSL Lines with 3Mb/768Kbps speeds load balanced for 60+ users. Accessing the Internet is borderline unusable. The simple solution would be to get a faster DSL Line but the highest DSL package is 6Mb/768Kbps, has quite the price jump, and doesn't do anything to help with upload speeds. I'm looking for free or extremely low cost solutions (web cache, traffic shaping, bandwidth controls, etc) to help with making Internet access more bearable until the next funding year. Can anyone give any advice? Part 2: We're looking into a 4.5Mb bonded T1 in the next funding year which is of course significantly more expensive than 2 DSL lines. Are bonded T1s our only hope for faster speeds? Are there any better alternatives?

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• Eliminating Windows 7 user tracking registry writes

  - by caffiend

  Windows 7 continues the practice of saving user actions in the registry. I'd like to disable this practice both to avoid reg-file fragmentation and SSD wear, as well as being uncomfortable with programs being able to quickly analyze my usage habits. Even with the "Turn off user tracking" policy enabled, there are at least two areas that still contain user tracking: HKCU\Software\Classes\Local Settings\MuiCache This key stores a cache of most-recently accessed strings, including most-recently ran exe descriptions. MKCU\Software\Classes\Local Settings\Software\Microsoft Windows\Shell\BagMRU This directory stores the most recently viewed folders along with timestamps. Are there additional policy settings/registry entries to disable these writes? If not, is it possible to make these entries Volatile? Would it be practical to create a temporary hive (eg, on ramdisk) and map it over this location?

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• Session cach and tmp folder error on cPanel Centos

  - by Danialzo

  One of my clients has come across multiple breakdowns in their websites with the following error PHP Code: Warning: session_start() [function.session-start]:open(/tmp/sess_1d6616afe1b8a0d91a8d9ec29254b453, O_RDWR) failed: No space left on device (28) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/index.php on line 177Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/currency.php on line 45&#65279;Notice: Error: Can't create/write to file '/tmp/#sql_4c5_0.MYI' (Errcode: 28) Error No: 1 They are experiencing this problem while: Nothing has been recently changed on the server tmp and other folders are occupied with not more than 10% of their total space The error come and goes I would really appreciate it if anyone could guide me through. Thanks in advance

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• Iozone: sensible settings for a server with lots of RAM

  - by Frank Brenner

  I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, testing I/O with hardware RAID in various configurations, ZFS zRAID, as well as I/O performance on vSphere and with KVM virtualization. In order to see real disk I/O performance without cache effects, I tried running Iozone with a maximum file of more than twice the physical RAM as recommended in the documentation, so: iozone -a -g100G However, as one might expect, this takes far too long to be practicable. (I stopped the run after seven hours..) I'd like to reduce the range of record and file sizes to values that might reflect realistic performance for an application server, hopefully getting the run times to under an hour or so. Any ideas? Thanks.

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• Apache LocationMatch throws 500 and AddOutputFilterByType does nothing

  - by tackleberry

  I need to add below directives to apache. But I get 500 when I add these lines. <LocationMatch "^/assets/.*$"> Header unset ETag FileETag None # RFC says only cache for 1 year ExpiresActive On ExpiresDefault "access plus 1 year" </LocationMatch> Additionally response is not gzipped when I add: AddOutputFilterByType DEFLATE text/html text/css application/javascript application/x-javascript Apache version is: Server version: Apache/2.2.22 (Unix) App: rails 3.2 app When I checked response&request for gzip problem, I see that browser requested gzip: Accept-Encoding gzip, deflate but response not gzipped.

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• Is there a way of disabled byte-range requests in Apache?

  - by Sam Minnée

  I have a web page with a link to a PDF file (target="_blank"). If I click the link, the PDF reader just shows a grey screen within the Firefox browser. If I copy that link and manually open it in a new tab, the PDF will display correctly, and subsequent requests made by clicking the original link now work, suggesting that the problem occurs when loading the file into the cache. It appears as though the Adobe PDF reader plugin is making byte-range requests (I see lots of 206 responses) and I suspect that this may be the cause of the issue. I am running an Apache webserver. Has anyone had problems with Apache and Adobe's byte-range requests? Are there any workarounds? Perhaps a way of configuring Apache to ignore byte-range requests on PDFs?

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• How to tell from what Ubuntu or Debian repository a package comes?

  - by gotgenes

  On a Debian-based system, including Ubuntu, how can one tell which repository a package will be downloaded from, without actually beginning the download? aptitude show and apt-cache info will show the section (e.g., metapackage, base, graphics), but not the repository to which a package belongs (e.g., http://ppa.launchpad.net/mactel-support/ppa/ubuntu or http://us.archive.ubuntu.com/ubuntu/). When installing the package, the actual repository appears during the download (it is printed out in the "downloading from ..." output from apt and similar programs), but how can one obtain information on the repository containing the package (or a specific version of a package) without downloading and installing it first? Additionally, how can one determine the source repository for a package that is already installed?

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• SharePoint Returning a 401.1 for a Specific User/Computer

  - by Joe Gennari

  We have a SharePoint Services 3.0 site set up supporting about 300 users right now. This report is isolated and has never been duplicated. We have one AD user who cannot log into the SharePoint site with his account from his machine and is subsequently returned a 401.1 error. If any other user tries to log on with their account from his machine, it works okay. If he moves to another machine and logs on, it works okay. The only solution to this point has been to install FireFox on the machine. When he authenticates with FF, everything is okay. Remedies tried so far: Cleared cookies/cache Turned off/on Integrated Windows Authentication in IE Downgraded IE 8 to IE 6 Removed site from Intranet Sites zone Renamed the machine Disjoined/Rejoined Domain

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• High Load average threshold in linux

  - by user2481010

  My one of friend said that his server load average sometime goes above 500-1000, for me it is strange value because I never saw load average more than 10. I asked him give me some snapshot of top and memory usages, he gave following details: TOP USAGES top - 06:06:03 up 117 days, 23:02, 2 users, load average: 147.37, 44.57, 15.95 Tasks: 116 total, 2 running, 113 sleeping, 0 stopped, 1 zombie Cpu(s): 16.6%us, 6.9%sy, 0.0%ni, 9.2%id, 66.5%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8161648k total, 7779528k used, 382120k free, 3296k buffers Swap: 5242872k total, 1293072k used, 3949800k free, 168660k cached Free $ free -gt total used free shared buffers cached Mem: 7 6 1 0 0 4 -/+ buffers/cache: 1 5 Swap: 4 0 4 Total: 12 6 6 Total cpu $ nproc 8 my question is it possible load average more than 100 on 8 core,12 GB mem Server? because I read many tutorial,article on load average, it said that thumb rule is "number of cores = max load" according to thumb rule here is max load average 16 then how his server running with 147.37 load server? he said that it is least value (147.37) some time goes more than 500.

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• kvm process has too large a memory footprint on host

  - by gucki

  I'm using latest ubuntu quantal and start a kvm guest which should have 2048 MB of memory. Now after a few hours I can see that the kvm process of this guest is around 2700 MB, so 700 MB more than the guest should be able to consume. I mean a small overhead like 1% would be ok, but not 30%?! root 8631 74.0 22.2 4767484 2752336 ? Sl Nov07 512:58 kvm -cpu kvm64 -smp sockets=1,cores=2 -cpu kvm64 -m 2048 -device virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100 -drive file=rbd:data/vm-disk-1,if=none,id=drive-virtio0,cache=writeback,aio=native -device virtio-net-pci,netdev=net0,bus=pci.0,addr=0x12,id=net0,mac=02:7a:86:e6:1a:6c,bootindex=200 -netdev type=tap,id=net0,vhost=on -usbdevice tablet -nodefaults -enable-kvm -daemonize -boot menu=on -vga cirrus root 8694 0.0 0.0 0 0 ? S Nov07 0:00 [kvm-pit/8631] How is this possible and how to prevent it?

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• trouble loggin into a Mac share from a Windows PC on the network

  - by villares

  I have this mixed network and usually log into the Macs from the Windows XP home machines and vice versa. I have no real networking knowledge, things just seem to work, more or less, with the default settings. Now I've got a new Snow Leopard Mac with a shared folder (added the user names of the Windows users at the sharing preferences) and the trouble is some machines can open the share and others can't. I can't see the difference. It feels like some Windows machines have a "cache" and won't ask for the share password, just deny access. I can also see old shares proposed at the Windows "add network place wizard".

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• Using FlashCache on /var on startup

  - by WinkyWolly

  I would like to have FlashCache cache my /var partition however I can't seem to get it to play nice upon bootup (IE: not really sure how to do it). I'm not sure if I need to modify the initramfs/use DKMS or if I can do it in user-land during bootup. The issue I'm running into is /var mounts early and therefore the device is busy (whether it by generally by syslogd). I'm positive this can be resolved by modifying the initramfs although I simply haven't fiddled with it enough to get it working. They have instructions on how to boot your root partition however I'm not sure if these instructions would apply to my use case. Any help / pointers in the right direction would be absolutely splendid.

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• Possible iphone animation timing/rendering bug?

  - by David

  Hi all, I have been working on an iphone apps for several weeks. Now I encounter an animation problem that I can't figure out how to resolve. Mayhbe you can help. Here is the details (a little long, bear with me): Basically the effect I want to achieve is, when user click a button, a loading view pops up, hiding the whole screen; and then the apps does a lot of heavy computation, which takes a few seconds. Once the computation is done, soem result views (something likes checkers on a checker board) are rendered under the loading view. Once all result views are rendered, I used animation animation to remove the loading view nand show the result views to the user. Here is what I do: when user click a button, run this code: [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1.0]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(loadingViewInserted:finished:context:)]; // use a really high index number so it will always on top [self.view insertSubview:loadingViewController.view atIndex:1000]; [UIView commitAnimations]; In the "loadingViewInserted" function, it calls another function doing the heavy computation work. Once the computation is done, a lot of result views (like checkers on a checker board) are rendered under the loading view. for(int colIndex = 1; colIndex <= result.columns; colIndex++) { for(int rowIndex = 1; rowIndex <= result.rows; rowIndex++) { ResultView *rv = [ResultView resultViewWithData:results[colIndex][rowIndex]]; [self.view addSubview:rv]; } } Once all result views are added, following animation is invoked to remove the loading view: [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1.0]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES]; [loadingViewController.view removeFromSuperview]; [UIView commitAnimations]; By doing this, most of the time (maybe 90%) it does exactly what I want. However, sometime I see some weird result: the loading view shows up first as expected, then before it disappears, some result views, which suppose to be under the loading view, suddenly appears on top of the loading view; and some of them are partial rendered. And then the loading view curled up, and everything looks normal again. The weird situation only lasts for less than a second, but already bad enough to screw up the UI. I have tried all different kinds of thing to fix this (using another thread to remove the loading view, make the loading view non-transparent), but none of them works. The only thing that makes a little better is, I hide all the result views first; after the last animation finished, in its call back, unhide all result views. But this loses the nice effect that when curling up the loading view, the results are already there. At this point, I really think this is a bug in iphone (I compile it with OS 3.0) OS. Or maybe you can point out what I have done wrong (or could do differently). (thanks for finishing this long post, :-) )

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• Is it reasonable to make a RAID-1 array with a ram disk and a physical disk to maximize read performance and protect data?

  - by Petr Pudlák

  In one of the answers on SO (I forgot which one) I've seen a suggestion to make a RAID-1 array composed of a RAM disk and a physical partition. By adding the physical partition with --write-mostly and enabling --write-behind the system should read everything instantly from the RAM disk but still save all data to the physical partition so that the data are preserved and the RAID array can be assembled again after reboot. Is such a setup reasonable? Will it perform any better in some scenario than having just the physical partition and perhaps tweaking the kernel to favor disk cache (swappiness and vfs_cache_pressure)?

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• Mysterious "media" volume mounted on desktop Mac OS X

  - by Allen

  I have a mysterious volume mounted on my desktop that I can't seem to forcibly unmount. I've tried using umount and also diskutil, but it seems to automatically remount itself. I've copied my hdd with Time Machine, and copied it onto a new computer, and it also has the drive mounted on it. It's not pointing to anything and I can't open it, nor can I forcibily remove it by hand with rm -Rf. Any ideas? I noticed this problem after I upgraded to Mountain Lion from Lion. It causes problems because when I try to select a file using the built in Finder dialog box, it freezes for a few minutes because it tries to cache or read into the "media" mounted volume.

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