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• i7 overclocking problem

  - by benwebdev

  Hi everyone, I've got an overclocked system that seems to be misbehaving. When trying to boot up from cold the system just hangs and nothing is output to the screen. Fans are on as they should but nothing happens to finish the boot. From here I have to switch it off then on again and the boot completes. If I go into the tweak menu in the BIOS I'm informed that a boot has failed I've been in touch with Overclockers UK support a bit and theres not yet been a solution. We've mainly been tweaking the voltage for the CPU. Any suggestions? I'm new to Overclocking which is why I got a bundle with OCUK. With this issue happening on Cold Boot too its tricky to test as I have to make a change then wait till the next day. My system is here: Intel Core i7 930 2.80Ghz overclocked to 4GHz Gigabyte X58A-UD3R (BIOS Version: FC) 6GB RAM Power Supply - CoolerMaster Silent Pro M series 700W One suggestion made by OCUK was that maybe its the power supply but I'm not sure and dont have a spare - it's brand new and a pretty expensive piece of kit. Any thoughts on this? Other recomendations for Power? thanks Ben

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• Resolving a BSOD/CPU/GPU issue...

  - by Christian Sciberras

  Hello all, I'm getting a BSOD / system crash (sometimes the PC just quits without a BSOD). Hardware Specifications cpu: i7 920 2666MHz / 8 cores (not OCed afaik) mobo: Asus P6T SE ram: 2x Corsair CM3X2G1333C9 (64bit DDR3 667MHz) gfx: ATI Radeon HD 5970 1GB (XFX HD5970 BE) os: Windows 7 Ultimate 64 bit (legit) All bios, firmware and drivers are all up to date (as of today). Symptoms Sometimes the PC runs smoothly, sometimes I get this BSOD. The BSOD always happens when I'm doing something related to graphics, such as viewing a video or playing a game. I get to know about the imminent BSOD ~10 seconds earlier; the PC starts freezing occasionally but increasing in frequency and length of lag (I noticed processor usage in creased from Process Monitor). I've tweaked BIOS settings occasionally but afaik, it was in vain. A day or so ago, I reset it to factory settings. BSOD contents The computer has rebooted from a bugcheck. The bugcheck was: 0x00000101 (0x0000000000000019, 0x0000000000000000, 0xfffff88001f35180, 0x0000000000000004). 15-12-2010 A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Internal Timer Error Processor ID: 4 23-12-2010 A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Internal Timer Error Processor ID: 2 Important The interesting thing is that although the event log (and BSOD screen) blame a "secondary processor", Windows Action Center sometimes blamed the GFX driver (for the same error). Also It is interesting to note that after hibernating my PC, I always get the BSOD.

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• Integrated Graphics went kaput, can I switch to dedicated graphics if I can't get into the BIOS

  - by Om Nom Nom

  I have an 8 year old computer (Pentium 4 1.6 GHz, 256 MB DDR RAM) which is not turning on (it beeps for 10 seconds and then goes off). Nothing appears on the screen, so I can't get into the BIOS. A computer repair person listened to the beeping pattern and told me that its because of the integrated graphics on the motherboard is defective. It's an ASUS P4S333-VM motherboard and the graphics solution is SiS 650. He tried putting in a PCI graphics card expecting that the computer will use that instead and ignore the integrated graphics, but apparently older computers don't switch automatically to the dedicated graphics card; it needs to be changed from the BIOS. But, I can't get inside the BIOS settings as I already said. I am told that the only option now is to replace the motherboard (which is not feasible since it's very old now). So, is there any way to make the computer use the PCI graphics card? IIRC, the motherboard also has an AGP port, but I think that it will also need to be selected from the BIOS?

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• What is Best storage servers infrastructure ? DAS/NAS/SAN or installing GlusterFS/LUSTER/HDFS/RBDB

  - by TORr0t

  I am trying to design an infrastucture for the project I am working on. It would be somehow a file-sharing/downloading project (like rapidshare) and I would need high storage sizes and good scability, and I would add new storage nodes after my project grows up. I have come up with 3 solutions for my project which are using Luster, GlusterFS, HDFS, RDBD. For start, i would have 2 servers, one server is for glusterfs client + webserver + db server+ a streaming server, and the other server is gluster storage node. (After sometime, i would be adding more node servers, and client servers (dont know how many new client new servers to add, will see later) So, i am thinking to work with glusterfs. But i really wonder that if i have to use high performance servers with high sotrage sizes or avarage/slow servers with high storage sizes? Or nas/das/san solutions are better for glusterfs storage nodes? I might buy a nas and install glusterfs onto it. I would be happy to listen to your recommendations for the server properties (for each clients and nodes) . I really dont know if I really need high amount of ram and good cpus to for the nodes. I am sure i need it for client servers. The files would be streamed as well, so the Automatic file replication is important, thus, my system should work like a cloud, when needed, according to high traffic, the storage nodes should copy the most demanded file to be streamed and would help me to get rid of scability problems and my visitors would able to stream/download those files. Also, i am open to your experiences/thoughts about any good solution. Luster, hdfs, rbdb are the other options and i would be happy to listen to your thoughts here. I would be very very happy to hear back from anyone commented of any words I have used here. Thanks

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• Windows 7 Blank Screen on Boot / Login

  - by Greg

  I have a new system that's having a few problems... sometimes (seems to be when the PC is cold, i.e. has been switched off for a while, though that could be my imagination) I get a blank blue screen when I boot up. The system boots normally and auto-logs-in. The desktop loads and I'm even able to launch applications, but then everything disappears and the screen goes to the default windows desktop blue colour (not the desktop image, just a plain blue with no mouse cursor). At this point the machine completely locks up - I'm unable to even toggle Num Lock and have to hold in the power button for 5 seconds to kill it. Interestingly if I manage to launch some applications before it goes blank, they will usually crash... sometimes explorer.exe will crash too. When I reboot, the system is fine and stable. I've installed the latest graphics drivers and run memtest86+ for 6 passes (and counting) with no errors. The system specs are: CPU: Intel I7 2.66 @ 3.4GHz RAM: 6GB (3 * 2GB DDR3) HDD: 128GB Crucial M225 SSD Motherboard: Gigabyte EX58-UD3R Gfx: ATI Radeon Sapphire 5870 1GB Note: There are a few similar questions but I haven't found one that matches my symptoms

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• Bare-metal virtualisation for the desktop

  - by Andrew Taylor

  Hi, Does anyone have any knowledge about bare-metal virtualisation products? I'm interested in building a new desktop machine for home, I've been looking at the Intel Quad Core processors and I'd like to put 8GB of RAM in there, but, it got me thinking about making the most out of the available resources. I thought if I could get a good 64bit machine, put some bare-metal virtualisation on, then have a primary system, I'd also be able to bring up some extra virtualised systems as and when I needed. I know most of the bare metal systems are designed for the server market, but, is there anything out there that works well for a desktop. What are the caveats? I presume I won't be able to make the most out of any video cards I could buy, what about just getting a decent screen resolution, will this be a problem? I run a single 24" screen. What about DVD/CD writing, is this possible? I'd like to re-rip my CD collection, I was hoping the quad 64Bit goodness would help me out with the encoding. I currently use a Mac and couldn't go back to windows so that leaves Linux, I was thinking a primary OS of ubuntu. Does this make a difference? Thanks Andrew

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• Script errors when run by launchd at startup, but not when run in Terminal

  - by Mechcozmo

  Hello. I'm attempting to create a RAM disk that loads the previous contents when the system starts up, and every six hours writes the contents to a disk image. Currently, when you run the script from the terminal ("sudo bash LogToRAM.sh") everything works fine. But when run from launchd during startup, it doesn't work. Here's the lines from the log; the first line just gives some idea as to where in the boot process we are: SecurityAgent[202] Showing Login Window com.mechcozmo.LogToRAM[51] + /Developer/usr/bin/SetFile -a V /Volumes/LogfileRAMdisk com.mechcozmo.LogToRAM[51] ERROR: File Not Found. (-43) on file: /Volumes/LogfileRAMdisk com.mechcozmo.LogToRAM[51] + /usr/sbin/asr -source '/Library/Application Support/LogToRAM/RAMdisk_store.dmg' -target /Volumes/LogfileRAMdisk/ -noverify Here is the script and plist file in question. Note that 'set -vx' is up at the top of the script; it give a lot of information about what is happening in the script. My current theory is that the /Volumes directory does not exist at this stage of the boot process, but that seems unlikely to be honest.

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• MySQL problem with many concurrent connections

  - by user48303

  Hi, here's a sixcore with 32 GB RAM. I've installed MySQL 5.1.47 (backport). Config is nearly standard, except max_connections, which is set to 2000. On the other hand there is PHP5.3/FastCGI on nginx. There is a very simple php application which should be served. NGINX can handle thousands of request parallel on this machine. This application accesses MySQL via mysqli. When using non-persistent connections in mysqli there is a problem when reaching 100 concurrent connections. [error] 14074#0: *296 FastCGI sent in stderr: "PHP Warning: mysqli::mysqli(): [2002] Resource temporarily unavailable (trying to connect via unix:///tmp/mysqld.sock) in /var/www/libs/db.php on line 7 I've no idea to solve this. Connecting via tcp to mysql is terrible slow. The interesting thing is, when using persistent connections (add 'p:' to hostname in mysqli) the first 5000-10000 thousand requests fail with the same error as above until max connections (from webserver, set to 1500) is reached. After the first requests MySQL keeps it 1500 open connections and all is fine, so that I can make my 1500 concurrent requests. Huh? Is it possible, that this is a problem with PHP FastCGI?

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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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• limits.conf to set memory limits

  - by Rupert Jipe

  I would like to limit any process from using more than 500 MB of RAM. AFAIK this is done using RSS in /etc/security/limits.conf but the process called gnome-panel apparently is using 618436 kB of VmRSS. How can this be ? /etc/security/limits.conf * hard rss 512000 username@debian:~$ cat /proc/3002/status Name: gnome-panel State: S (sleeping) Tgid: 3002 Pid: 3002 PPid: 2910 TracerPid: 0 Uid: 1000 1000 1000 1000 Gid: 1000 1000 1000 1000 FDSize: 64 Groups: 20 24 25 29 44 46 112 116 117 1000 1002 1003 VmPeak: 916636 kB VmSize: 916636 kB VmLck: 0 kB VmHWM: 618436 kB VmRSS: 618436 kB VmData: 601972 kB VmStk: 104 kB VmExe: 516 kB VmLib: 29232 kB VmPTE: 1760 kB Threads: 1 SigQ: 0/14001 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000020001000 SigCgt: 0000000180000000 CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: ffffffffffffffff Cpus_allowed: 3 Cpus_allowed_list: 0-1 Mems_allowed: 00000000,00000001 Mems_allowed_list: 0 voluntary_ctxt_switches: 871965 nonvoluntary_ctxt_switches: 47553 PaX: PeMRs username@debian:~$ cat /proc/3002/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 0 bytes Max resident set 524288000 524288000 bytes Max processes 100 100 processes Max open files 1024 1024 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 14001 14001 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us

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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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• Viability of Apache (MPM Worker), FastCGI PHP 4/5.2/5.3, and MySQL 5

  - by Adrian

  My server will be hosting numerous PHP web applications ranging from Joomla, Drupal, and some legacy (read: PHP4) and other custom-built code inherited from clients. This will be a development machine used by a dozen or so web developers and issues like fluctuating loads or particularly high load expectations are not important. Now, my question: are there any concerns I should know about when using Apache w/ MPM Worker, PHP 4/PHP 5.2/PHP 5.3 (all via FastCGI), and MySQL 5 (with a query cache of 64MB)? I have not tested the various applications extensively and I have only recently learned how to install PHP and utilize it via FastCGI (rather than mod_php, which in this case seemed impossible (considering the multiple versions of PHP and the desire to use MPM Worker over MPM Prefork)). I have come to understand that there could be concerns regarding XCache and APC, namely non-thread-safety issues where data becomes corrupted and the capability to use MPM Worker becomes null and void. Is this a valid concern? I have been using my personal testing server (running Ubuntu Server Edition 10.04 in VirtualBox) which has 2GB of RAM available to it. Here is the configuration used (the actual server will likely use a configuration more tailored to suit it's purposes): Apache: Server version: Apache/2.2.14 (Ubuntu) Server built: Apr 13 2010 20:22:19 Server's Module Magic Number: 20051115:23 Server loaded: APR 1.3.8, APR-Util 1.3.9 Compiled using: APR 1.3.8, APR-Util 1.3.9 Architecture: 64-bit Server MPM: Worker threaded: yes (fixed thread count) forked: yes (variable process count) Worker: <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 400 MaxRequestsPerChild 2000 </IfModule> PHP ./configure (PHP 4.4.9, PHP 5.2.13, PHP 5.3.2): --enable-bcmath \ --enable-calendar \ --enable-exif \ --enable-ftp \ --enable-mbstring \ --enable-pcntl \ --enable-soap \ --enable-sockets \ --enable-sqlite-utf8 \ --enable-wddx \ --enable-zip \ --enable-fastcgi \ --with-zlib \ --with-gettext \ Apache php-fastcgi-setup.conf FastCgiServer /var/www/cgi-bin/php-cgi-5.3.2 FastCgiServer /var/www/cgi-bin/php-cgi-5.2.13 FastCgiServer /var/www/cgi-bin/php-cgi-4.4.9 ScriptAlias /cgi-bin-php/ /var/www/cgi-bin/

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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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• Will Intel be releasing anymore 6-core processors soon?

  - by jasondavis

  I am about to start buying parts every week for as long as it takes me to build the best PC I can build. I am looking at the Intel i7-920 processor right now because it is about 250$ and it is a quad-core processor based on the x58 chipset I believe. From what I have read so far, intel is coming out with some 6-core processors soon that will also use the x58 chipset and will allow me to use the same motherboard and memory/ram to upgrade to a 6-core. This sounds really good to me right now. I just read that the new 6-core processor. The Core i7-980X (extreme edition) was just released which is the first 6-core processor but it is supposed to be around $1,000 so I will probably just get the i7-920 for now and then upgrade to the 6-core version when the price goes down. The motherboard I am looking at getting the GIGABYTE GA-X58A-UD5 which is around $280 at newegg.com So that is my basic plan SO far. I have not purchased any parts yet. I am just wanting to ask if this sounds like a good idea or if I should wait longer if I am wanting to eventually have a 6-core processor. Does anyone know if Intel is planning on releasing any other 6-core processor in addition to the Core i7-980X in the near future? I just want to make sure I am buying the best setup for my money if I am going all out on it, thanks for any tips/advice.

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• Media Center setup won't complete for watching TV

  - by Robert

  I have a problem watching TV in Media Center. The TV constantly pauses 1/2 second then plays 1 second, pauses 1/2 second, plays 1 second - it is constant and does not vary. This problem occurs on all channels, live or recorded. The bottom 5th of the screen is solid green. I know the problem is Media Center because I can use Pinnacle's TVCenterPro and there is no skipping/pausing (and not green on bottom). I was using cable, and switched to DirecTV (satellite). Trying to do "Set up TV signal" in Media Center seems to be what broke it. I get an error "IR Hardware not detected." I can use the remote to "try again" - so the IR hardware works fine (Media Center's remote/sensor). I tried plugging the IR Blaster into both ports, and I tried a different USB port for the IR receiver. I can't complete the setup. Media Center was playing it okay before I tried to run setup. (I ran setup to try to do recording with Media Center.) Pinnacle PCTV 800i HD PCI card (coax cable from DirecTV tuner), ATI Radeon HD 3200 Graphics, Windows XP SP3 Media Center Edition, AMD Athlon Dual Core 2.5 GHz, 1.75 GB RAM.

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• I can't connect to my network, except in safe mode

  - by eidylon

  My laptop cannot connect to my network all of a sudden except in safe mode. When it boots, it will show the networks available in the tray popup, but if I click connect on any, it says "Unable to connect" and the troubleshooter is useless. Shortly thereafter all the networks disappear. I have tried removing IPv6 support as I have seen that cause problems. No joy. I've also tried removing the wireless network adapter in Device Manager and reinstalling it, also no joy. I've also tried attaching a USB wireless adapter, and it has the same problem. If I boot in safe mode, then it has no problems at all. Three other devices in the house connect fine, so I am pretty sure it is nothing to do with the router. Any ideas what to check next? I am running Win7 Ultimate on a 2GHz Quadcore with 8GB RAM with a Broadcom 802.11n wireless card. EDIT: RE wired connections: What is very weird is that if i plug in a wired connection, then not only does it connect via the wired connection, but the wireLESS also starts working perfectly. And a soon as I unplug the wire, then the wireLESS stops working again! So it seems the wireless is right now working only in safe-mode, or when a wired connection is also plugged in.

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• dd oflag=direct 5x fast

  - by César

  I have Centos 6.2 in server with this specs: 2xCPU 16 Core AMD Opteron 6282 SE 64GB RAM Raid controller H700 1GB cache NV - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (OS Centos 6.2) sda - 4HD 146GB SAS 15Krpm RAID10 stripe 16k (ext4 bs 4096, no barriers) sdb -> /vol01 Raid controller H800 1GB cache nv - MD1200 12HD 300GB SAS 15Krpm RAID10 stripe 256k (For DB Postgres 8.3.18) (ext4 bs 4096, stride 64, stripe-width 384, no barriers) sdc -> /vol02 I'm benchmarking IO speed with dd, and view thah if in RAID10 12 disk exec: dd if=/dev/zero of=DD bs=8M count=10000 oflag=direct 10000+0 records in 10000+0 records out 83886080000 bytes (84 GB) copied, 126,03 s, 666 MB/s but if I remove "oflag=direct" option obtain about 80 MB/s. In read benchmark, results are similar: dd of=/dev/null if=DD bs=8M count=10000 iflag=direct 10000+0 records in 10000+0 records out 83886080000 bytes (84 GB) copied, 79,5918 s, 1,1 GB/s If remove iflag=direct obtain 150MB/s... I don't understand this huge differences, on other machines y don't have this behavior. Can I have some kernel parameter misconfigured? Thanks!

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• Apache is spawning more and more processes!!

  - by erotsppa

  We have a LAMP setup that is working prety good for half a year. All of a sudden today the apache server (mysql servers are not on this box) started to die. It seems to have started to spawn more and more processes over time. Eventually it will consume all the memory and the server would just die. We are using prefork. In the mean time what we are doing is just added more ram and increased the MaxClients and ServerLimit parameter to 512. We're just prolonging the crash. The number still goes up slowly. Maybe in a day, it would reach that limit. What is going on? We only have around 15-20 request per second. We have 1Gb memory and it's not half used, there's no swapping going on. Why is apache creating more and more processes? It's almost like theres a leak somewhere! The database boxes are fine, they are not causing a delay to requests. We tested some queries everything is quick!

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• Will adding a SSD cache device to my ZFS storage improve performance?

  - by Sysadminicus

  The server has 4GB of RAM and my zpool is made up of 15.5k SAS drives arranged like this: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c0t2d0 ONLINE 0 0 0 c0t3d0 ONLINE 0 0 0 c0t4d0 ONLINE 0 0 0 c0t5d0 ONLINE 0 0 0 c0t6d0 ONLINE 0 0 0 c0t7d0 ONLINE 0 0 0 c0t8d0 ONLINE 0 0 0 raidz1-1 ONLINE 0 0 0 c0t10d0 ONLINE 0 0 0 c0t11d0 ONLINE 0 0 0 c0t12d0 ONLINE 0 0 0 c0t13d0 ONLINE 0 0 0 c0t14d0 ONLINE 0 0 0 spares c0t9d0 AVAIL c0t1d0 AVAIL The primary use is as an NFS store for a couple VMWare ESXi servers. I can't do any "true" benchmarks because this is a production system (no budget for test systems), but using dd and bonnie++ I can't get more than ~40-50MB/s writes and ~70-90MB/s reads. It seems I should be able to do much better, but I'm not sure where to optimize. Based on what I've read, I think dropping in a OCZ Vertex 2 Pro SSD as my L2ARC is going to be the best bang-for-the-buck to improve througput. Is there something else I should be looking into to help performance? If not... How do I know how big a cache device I need? Am I safe with only a single SSD as my cache device?

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• Ubuntu Server mdadm drbd ocfs2 kvm hangs under heavy file reading

  - by Stefano Annese

  I have deployed four ubuntu 10.04 server. They are coupled two by two in a cluster scenario. on both sides we have software raid1 disks, drbd8 and OCFS2 and on top of it some kvm machines run with qcow2 disks. I followed this: Link corosync is just used for DRBD and OCFS, the kvm machines are run "manually" When it works is fine: good performances, good I/O, but at a given time one of the two cluster started hanging. Then we tried with just one server turned on and it hangs the same. It seems to happen when an heavy READ in one of the virtual machines occurs, that is during rsyn backup. When the fact occurs the virtual machines are not reachable any more and the real server responds with good delay to the ping but no screen and no ssh is available. All we can do is force shutdown (hold the button) and restart and when it turns on again the raid on which relay drbd is resyncing. All the time it hangs we see such fact. After a couple of week of pain on one side this morning also the other cluster hung, but it has different moteherboard, ram, kvm instances. What is similar is reading for rsync scenario and Western Digital RAID Edistion disks on both side. Can anybody give me some input to solve such issue?

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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 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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• Debugging a Drobo that chokes Windows 7x64 When Plugged In

  - by Pridkett

  I've had a love hate relationship with my Drobo for a long time. After two years of using it on a Linux box, I moved it over to a Windows 7 machine where it seemed to work just fine for a long time, but it was under very light usage. Mainly backups that never actually happened. Recently I began using it for additional backup services (through CrashPlan, which is great). This means the Drobo gets a lot more usage. Also it means that something interesting happens, the Drobo can choke my system on startup. Here's what I mean: Start computer without Drobo plugged in, CrashPlan and Drobo Dashboard services disabled: 105s Start computer with Drobo plugged in Crashplan disabled, Drobo Dashboard enabled: 250s (and 1 cpu at 100% for a very long time, drobo churning) Start computer with Drobo plugged in, CrashPlan and Drobo Dashboard disabled: 250s (1 cpu at 100% for a very long time, drobo churning) Start computer with Drobo plugged in, Crashplan and Drobo Dashboard enabled: 300s (1 cpu at 100% for a very long time, drobo churning) If I yank the USB plug on the Drobo the CPU usage goes down to nothing very quickly. The slow startup in the fourth scenario is because CrashPlan is trying desperately to load stuff up on the H: drive before it gives up, so I've disabled it for the time being. So here's my question: What the heck is going on when I plug the drobo in? I've fired up Process Explorer and see that the System process is hogging the CPU, specifically it's an ntoskrnl.exe/KdPollBreakIn thread that's going ape. Is this something that's wrong with Drobo? Windows? Any idea on how to find out? If it matters, here's tech info: Athlon 64x2 4400, 2GB RAM, Win7 Ultimate, Drobo USB (2x1TB, 2x320GB)

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• Reduce power consumption of gaming computer while idle

  - by White Phoenix

  This is my current build: EVGA X58 (first generation) motherboard Intel i7 965 clocked @ 3.3 Ghz 3x DDR3-1600 Corsair RAM at stock timings and voltages Corsair AX750 80 Plus Gold PSU 1 Optical Drive 1 Seagate 7200.10 500 GB drive 2x Western Digital Caviar Black 1 TB drives OCZ Vertex 1 60 GB EVGA GTX 460 oc'd at 800/1600/1850 Antec 1200 case HT-Omega Striker 7.1 Sound Card Windows 7 32-bit Professional (PAE Enabled) I've already seen this post Reduce power use on computer and this post How do I lower power consumption of my computer and while useful, I'm looking for answers specific to my build and OS. I'm pretty sure this build is a energy-intensive build by default, but I want to try to reduce the amount of energy my build uses when I leave it idle (when I go to bed or go out, etc). The first requirement for this machine is that I need to leave it on, so I cannot turn it off while it's being unused. I run it as a file server for personal reasons and I also leave it on in case people leave me messages on various IM services and chat clients (IRC, MSN, Steam, XFire, Pidgin, etc). I'm also unable to replace the parts in my computer with a cheaper "greener" part. What are some ways to minimize the amount of power the machine uses? I'm already using a high efficiency power supply (80 Plus Gold), but I imagine there's other things that can be done in the BIOS and Windows' power settings to reduce power usage while I'm not using the computer. From what I can tell, I can't use Sleep since that'll disable network access (whole reason why I leave the computer on in the first place). I already turn off my monitor when it's not in use. I enabled Intel SpeedStep within the BIOS (I know, I have a 965 and why am I enabling SpeedStep?) Should I bring the graphics card back to stock speeds and lower the clock on the processor even more? Main reason why I'm asking is I think this computer alone is the reason why my power bill is high, so I want to reduce its consumption to as low as possible without having to shut the thing down.

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• How do I compile DarWINE in PowerPC Mac OS X 10.4.11...?

  - by Craig W. Davis

  So far I've tried using MacPorts which gives me this error: /Error: Cannot install wine for the arch(s) 'powerpc' because Error: its dependency pkgconfig is only installed for the archs 'i386 ppc'. Error: Unable to execute port: architecture mismatch To report a bug, etc... (I'm not allowed to post two links due to being a new poster...)./ I've also tried using the build script I found in the DarWINE 0.9.12 SDK download that I found on the DarWINE SourceForge.net Project Page... I've also tried the build script that I found at http://code.google.com/p/osxwinebuilder/#Building_Wine_via_the_script... None of these attempts to build DarWINE have actually worked. Whenever I build using the DarWINE build script I run it as follows: /1. I decompress the WINE tarball into ~/Downloads/WINE 2. I cd into ~/Downloads/DarWINE. 3. I run ./winemaker ~/Downloads/WINE/wine-1.2.2 or ./winemaker ~/Downloads/WINE/wine-1.2-rc2 (the reason for trying WINE 1.2-rc2 is that some people managed to get it to build on PowerPC Macs running 10.5.8...)./ I made sure to install Xcode Tools 2.5 & all the SDKs too... The net result is either a syntax type error resulting from trying to run the checked out Google Code DarWINE build script or a bunch of make errors when trying to run the official DarWINE build script that I forcefully extracted from the DarWINE 0.9.12 SDK .dmg file by using Pacifist. I trying to build DarWINE on mid-April 2006 1.42 GHz eMac with DL SuperDrive with Bluetooth 2.0+EDR with 2 GBs of RAM running 10.4.11 as I mentioned earlier... (it came with 10.4.4 on the Mac's Restore DVD-ROM that I ordered from 1-800-SOS-APPL & coconutIdentityCard told me it was made on April 12th 2006 & I know that's right because when I reinstalled Mac OS X 10.4.4 it displayed that it was registered/previously owned by a Hawaiian school...): /make[1]: winegcc: Command not found make[1]: * [main.o] Error 127 make: * [dlls/acledit] Error 2./

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