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  • Server with 3 Disk, what's the best HD Configuration?

    - by aleroot
    I Have an HP Server with a quad core Opteron and 3 Disk 250Gb S-ATA Disk, i'm thinking about what's the best configuration of the disk for performance and reliability. There is mainly 2 scenario : -RAID 5 with these 3 HD (on the the array 100GB Partition for OS, Other Space for Data Partition) -RAID 1 + 1 Disk for OS (one single Disk OS Installation, RAID 1 Array for a Data Partition) What's the best configuration ? In the Server Run MySQL and Small Document File server, the OS to be installed is Windows Server 2008 ...

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  • Weird nfs performance: 1 thread better than 8, 8 better than 2!

    - by Joe
    I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a 1GB file on the client is much lower than what would be expected based on the measured network connection speed between the two VMs and the measured speed of reading the file directly on the server. The VMs are running Ubuntu 9.04 and the server is using the nfs-kernel-server package. According to various NFS tuning resources, changing the number of nfsd threads (in my case kernel threads) can affect performance. Usually this advice is framed in terms of increasing the number from the default of 8 on heavily-used servers. What I find in my current configuration: RPCNFSDCOUNT=8: (default): 13.5-30 seconds to cat a 1GB file on the client so 35-80MB/sec RPCNFSDCOUNT=16: 18s to cat the file 60MB/s RPCNFSDCOUNT=1: 8-9 seconds to cat the file (!!?!) 125MB/s RPCNFSDCOUNT=2: 87s to cat the file 12MB/s I should mention that the file I'm exporting is on a RevoDrive SSD mounted on the server using Xen's PCI-passthrough; on the server I can cat the file in under seconds ( 250MB/s). I am dropping caches on the client before each test. I don't really want to leave the server configured with just one thread as I'm guessing that won't work so well when there are multiple clients, but I might be misunderstanding how that works. I have repeated the tests a few times (changing the server config in between) and the results are fairly consistent. So my question is: why is the best performance with 1 thread? A few other things I have tried changing, to little or no effect: increasing the values of /proc/sys/net/ipv4/ipfrag_low_thresh and /proc/sys/net/ipv4/ipfrag_high_thresh to 512K, 1M from the default 192K,256K increasing the value of /proc/sys/net/core/rmem_default and /proc/sys/net/core/rmem_max to 1M from the default of 128K mounting with client options rsize=32768, wsize=32768 From the output of sar -d I understand that the actual read sizes going to the underlying device are rather small (<100 bytes) but this doesn't cause a problem when reading the file locally on the client. The RevoDrive actually exposes two "SATA" devices /dev/sda and /dev/sdb, then dmraid picks up a fakeRAID-0 striped across them which I have mounted to /mnt/ssd and then bind-mounted to /export/ssd. I've done local tests on my file using both locations and see the good performance mentioned above. If answers/comments ask for more details I will add them.

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  • How to use dedicated video card instead of onboard?

    - by Mathias Lykkegaard Lorenzen
    Hi there! I tried running DxDiag (DirectX diagnostics), and I noticed that my graphics card is set to the onboard one that comes with the Core i5 processor (some Intel HD stuff). On my computer, I also have a dedicated graphics card (an Nvidia 310). No serious gaming stuff, I know - just for programming. However, I would still love to know how to switch to that dedicated graphics card instead. My laptop is an MSI CX720.

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  • Is the following combination of components valid to function as a desktop computer? [closed]

    - by Gideon Potgieter
    Could someone with more PC building experience than me tell me whether these PC components can cooperate fully as a self-made PC? Processor: Intel Core i5-3570K Video card: Asus Radeon HD 7870 Motherboard: Gigabyte GA-Z77-D3H RAM: Corsair CMZ16GX3M2A1600C10 Vengeance 16GB 1600MHz CL10 DDR3 (x2) Storage: Western Digital WD1002FAEX (x2) Display: Samsung S24B300HL Sound: Logitech X140 Chassis: Thermaltake V4 Black Edition VM30001W2Z Power supply: Seagate OEM 500W Builder PSU Optical drive: Asus DRW-24B1ST Thanks in advance! (btw, I know 32 GB RAM is unnecessary, but I want to buy it to use as a reserve)

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  • mysqldump trigger crashed tables

    - by m4rc
    We had a database crash this morning starting at 1 minute past midnight (when the database backup runs). The exception emails I was getting said "Table './core/content' is marked as crashed and should be repaired". My question is basically, can mysqldump cause tables to crash, if so how and why? And are there any tools which can detect a crashed table and run a repair on it? Thanks in advance.

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  • What are optimal strategies for using mapreduce and other applications on the same server?

    - by user45532
    I have two applications that I need to run continuously to process data. 1.) An app that processes and aggregates information from sources 2.) A mapreduce workflow* that processes the above info I've thought about either getting vps hosting or getting my own inexpensive server and using xen to split the resources of the server. Getting a quad core box with 2 GB of Ram seems a lot cheaper than the grid options I've seen at slicehost, rackspace and others...

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  • A problem in my windows boot menu

    - by user210332
    Hi, One i had kept a supervisor password to my windows boot screen, but now i forgot that password, Now i am unable to access the boot menu since its asking the password, all menu options are disabled. Is it possible to remove that password and can i get the boot menu default settings back? Processor: Intel Pentium dual core (2) OS : XP Thanks in Advance,

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  • mod_pagespeed using up too many resources?

    - by OC2PS
    I have found several threads from 2010 and early-2011 talking about excessive resource usage by mod_pagespeed I haven't seen any recent ones. I am facing excessive memory usage, which is causing server to crash several times a day. I am wondering if the issue was ever fixed before mod_pagespeed 1.0 was released. Also, request any tips and suggestion on how to fix the issue. My server configuration: 4 quad-core processors (likely oversold) 3GB memory Xen Centos 6 64-bit Apache cPanel PHP mySQL

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  • Can my PC run Need for Speed Shift

    - by John
    Here are my PC's specs: Operating System MS Windows 7 32-bit CPU Intel Mobile Core 2 Duo T8100 @ 2.10GHz Penryn 45nm Technology RAM 3.0GB Dual-Channel DDR2 @ 332MHz 5-5-5-15 Motherboard Sony Corporation VAIO (N/A) Graphics Nvidia Defaul @ 1280x800 256MB GeForce 8400M GT (Sony) Hard Drives 250GB Hitachi Hitachi HTS542525K9SA00 ATA Device (IDE) Optical Drives Optiarc DVD RW AD-7560A ATA Device Audio High Definition Audio Device

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  • Can I install 64-bit OS on my Dell Inspiron 1545 laptop?

    - by Dell user
    My Dell Inspiron 1545 laptop features the Intel Pentium Dual Core T4200 processor. When I bought it, it came preinstalled with Windows Vista Home Basic, 32-bit. I'm considering upgrading it to Windows 7 Home Premium, but I don't know whether I should order the 64-bit or 32-bit version. The information I found on the web has been confusing. Does anyone know if my laptop supports 64-bit OS?

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  • WPF & RenderTierCapability, what could cause a machine to be dropped from Tier 2 to 0?

    - by Erode
    I'm having an issue on some imaged machines where they will started out on Tier 2 and after some time of use (they are well spec'd kiosk machines, quad-core, Nvidia 550Ti), they drop to Tier 0 and effectively become useless. Restarting the machine doesn't seem to help. This is a problem more than just "missing hardware acceleration" because my application requires D3DImage to function (which requires Tier 2). Thanks for any help!

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  • how to set windows 7 resolution to 16:9 in virtualbox running in ubuntu 12.04 as a host?

    - by Gabriele
    I have installed Virtualbox in Ubuntu 12.04, and I created a virtual guest with Windows 7 64bit. Guest additions were also installed. It works fine, but I can't set the resolution to anything higher than 1600 x 1200, whereas my screen is 1920x1080. Here's my system specifications: Intel(R) Core(TM) i7-3632QM CPU @ 2.20GHz AMD Radeon 7650 VGA 8 Gb RAM DDR3 Moreover, if I try to enhable 3D acceleration in the settings of my guest, when I expand to full screen it aborts... Thanks in advance Gabriele

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  • Can all-in-one desktops be good developer machines?

    - by user6900
    I was just going through some all-in-one desktop PCs (Dell Studio One, HP Touch Smart, Lenovo IdeaCenter, etc.) and their specs really look good (4 GB RAM, 2.x GHz Core 2 Duo, etc.) Are there any disadvantages of such PCs as a developer machine? I mostly do Java (Eclipse + MySQL + Tomcat / JBoss) or .NET (Visual Studio + MsSQL) development. Edit: One common question I could see is harddrive size and that's around 320 GB 7200 RPM.

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  • run a 2nd computer as an extra processor

    - by MMK
    I have a laptop with a busted l.c.d., but otherwise works fine with an external monitor. I was wondering if it is possible to connect it to my main pc as an extra processor(main pc is getting old, it's only single core processor) and if so how? I currently have them connected with a network cable so that I can access the laptop's hard drive but would like to use it to give my pc a bit more power. Both my pc and my laptop have 2 gb ram and are running windows vista sp2

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  • Can an old MacBook be upgraded to OS X Lion?

    - by itenyh
    I've just got a really old MacBook and I want to upgrade it to the latest OS version. I do not know if it supports to be upgraded, the config of this MacBook is as below: Model Name: MacBook Model Identifier: MacBook1, 1 Processor Name: Intel Core Duo Processor speed: 1.83 GHz The number of processors: 1 Total Number Of Cores: 2 L2 cache: 2 MB Memory: 1 GB Bus speed: 667 MHz Boot ROM Version: MB11.006 If I increase the memory, can I upgrade it?

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  • how Infiniband speed is related to processor speed

    - by user223231
    I have two exactly the same servers and very curious how to make Infiniband interconnection between them? Both servers' basic specs are: CPU: 32GHz = 2x Intel Xeon X5650, 6 core, 2.66GHz and RAM: 24GB per server (edited) How determine what speed of Infiniband will be enough for perfect interconnection? SDR, DDR, QDR or FDR? My logic is 32Ghz = 32Gb/s and 40Gb one is enough, am I right or it is not that simple?

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  • Problem in the Windows boot screen

    - by Velmrugan
    Hi, Once i had kept a supervisor password to my windows boot screen, but now i forgot that password, Now i am unable to access the boot menu since its asking the password, all menu options are disabled. Is it possible to remove that password and can i get the boot menu default settings back? I had tried to change the jumper settings too, but the problem hasn't been solved. Processor: Intel Pentium dual core (2) OS : XP Thanks in Advance,

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  • Pushing only certain changes to all branches in Mercurial

    - by richzilla
    I have a mercurial repository with numerous branches for stable, development, experimental features etc. However, I've found a bug in a set of core application files that are common to each branch. Is there a way to modify these files, and then push the changes to the common files to all the other branches, without sending any other changes?

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  • my windows 7 laptop wont load past the windows logo

    - by lilpimp
    my computer wont load past the windows logo, when it finishing loading the logo i see a blue screen quickly flashes on and off just a glimpse of it but i recognise that sreen anywhere i know its a serious error message screen, after that it just shows a black screen with a movable cursor, i've tried to repair, load last good configuration, but nothing seems to work, i'm running windows 7, its a toshiba laptop, 4 GB SDRAM, 320 GB HDD, Intel Pentium Processor T4200, dual core processor.

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  • Windows 7 blue screen of Death while installing

    - by DSharper
    In my Core i5 desktop machine I tried to install windows 7 32 bit Ultimate. I received blue screen of death while installing OS. Earlier I had was 64 bit Windows vista which was working fine but now i cant install any of OS. When I try to re-install OS again same error screen pops up? how can I fix this ? I have 4GB of RAM installed does it have problems with 32 bit OS. When I install second OS I didn't reformat the entire hard disk.

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