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  • Does putting the XFS log on an SSD significantly improve performance?

    - by Paul Wagland
    I have a five disk array running XFS in RAID5, and I would like to improve it's performance. I have seen some hints that putting the log onto a separate device can help, does putting the log onto an SSD help dramtically? In theory, it should, but I have not been able to find any case studies where someone has actually done this, and buying an SSD and then having it not work well would be inconvenient at best…

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  • RAID clarification

    - by waiwai933
    Ok, I thought I understood RAID, but I'm looking at images from Wikipedia, and it doesn't seem like I do. For example, take this image: What does the 'parity' do? For example, what happens if Disk 2 suddenly fails? How does the system recover?

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  • Green flickering pixels that move with black images

    - by user568458
    Strange question... Occasionally, on my LCD screen, pixels that should be black flicker rapidly and constantly between black and green, about 4 flickers a second. The crazy part is, unlike dead/stuck pixels, they are relative to content on the screen and move with it. For example, I might be looking at a web page with a picture that has lots of black. There might be a couple of green flashing pixels in that black that shouldn't be there. I scroll the page, and the green flickering pixels move with the image. It seems that everyphysical pixel is fine, but somehow something interprets part of the image in a way that causes flickering green... It's not just in a web browser. My first thought was to blame a trolling blogger cunningly uploading an animated gif that simulates a failing pixel... but it happens in a wide range of applications. It seems to occur randomly, other than that it seems to only occur in areas of pure black, and it's always pure 100% green. It happens rarely enough that it's not a big deal, but it's such a strange problem it bugs me. I can't find any info on anything like this. I'm not even sure if it's hardware or software. Any ideas? (windows 7 laptop connected to LCD by DVI to HDMI cable)

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  • Erase personal data from corporate laptop

    - by microspino
    I need to delete my data from the company laptop. Nothing special just 2 or 3 folders (I have Dropbox installed on this PC) and I'd like to be sure they are gone. I read about free tools and bootable CDs to erase the entire disk, I don't need those but just a free tool to put some zeros where my data were before.

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  • Not able to install iPhone final 3.2 SDK

    - by user34475
    Hi All, I downloaded latest SDK xcode_.2.2.2_and_iPhone_SDK_3.2_final.dmg from apple site. I uninstall the old SDk and double click the .dmg file then i got a popup stating that "The following Disk Images couldnt found" and "xcode_3.2.2.2_and_iPhone_SDK_3.2_final.dmg is not recognized". I am using OS 10.6.3 Thank You

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  • Not able to install iPhone final 3.2 SDK

    - by user34475
    Hi All, I downloaded latest SDK xcode_3.2.2.2_and_iPhone_SDK_3.2_final.dmg from apple site. I uninstall the old SDk and double click the .dmg file then i got a popup stating that "The following Disk Images couldnt found" and "xcode_3.2.2.2_and_iPhone_SDK_3.2_final.dmg is not recognized". I am using OS 10.6.3 Thank You

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  • Apache caching with mod_headers mod_expires

    - by Aaron Moodie
    Hi, I'm working on homework for uni and was hoping someone could clarify something for me. I need to set up the following: Configure the response header "Cache-Control" to have a "max-age" value of 7 days since access for all image files Configure the response header "Cache-Control" to have a "max-age" value of 5 days since modification for all static HTML files. Configure the response header "Cache-Control" to have a value of "public" for all static HTML and image files. Configure the response header "Cache-Control" to have a value of "private" for all PHP files. My question is whether it is better to use a FilesMatch, or the mod_expires ExpiresByType to best achieve this? I've so far used the following: <FilesMatch "\.(gif|jpe?g|png)$"> ExpiresDefault "access plus 7 days" Header set Cache-Control "public" </FilesMatch> <FilesMatch "\.(html)$"> ExpiresDefault "modification plus 5 days" Header set Cache-Control "public" </FilesMatch> <FilesMatch "\.(php)$"> Header set Cache-Control "private" </FilesMatch> Thanks.

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  • hyperv machine guest loads slow

    - by Dani Avni
    this is by far one of the strangest things I have seen. I have a win 2008R2 cluster with a CSV. the CSV itself is on an iSCSI storage (hitachi HUS 110) basic config of the two hosts in the cluster is Dell R610 Win 2008 R2 with all patches 64GB 1 NIC for host access 2 NICs for guest access 2 NICs for iSCSI these machine work great and I can load a 2008R2 test guest machine on them in less than 90 seconds after the above config is running for over a year, I now need to add a new host. now the host is Dell R620 (Still intel but different CPU) Win 2008 R2 with all patches 64GB 1 NIC for host access 2 NICs for guest access 2 NICs for iSCSI I added this new host to the domain and to the cluster, I gave it access to the CSV and I tried loading the same guest machine that loads in 90 seconds in the other hosts. the machine loads in about 6 minutes. no matter how many times I try this the old hosts load the machine in about 90 seconds and this new host in around 6 minutes to eliminate any problems with the iSCSI connection, I added a new LUN and directly accessed it from the new host and I was working at around 300MB/s so no problem there. I also tested the connection between the other hosts and the new one and network is working fine there too. to eliminate problems in HyperV, I copied the machine to the local disk of the new host and it loaded in less than 20 seconds. now is the point were things get a lot stranger: in my tests I tried installing a fresh windows guest machine to the CSV from the new host. I noticed that while the fresh windows was installing, my test guest was loading in less than 90 seconds even on the new host (I repeated this a few times). If I paused the fresh install guest and tried loading the test guest again it loaded in 6 minutes. and again after I resumed the guest installation the test guest loaded fast. after the fresh windows was also loaded, I ran tests loading the fresh window and my test machine. each one of them loaded in about 5 minutes when I tried loading them separately. however when I started both of them in the same time they both loaded in around 2.5 minutes it seems that the iSCSI disk access is only working if it is under some load (although I never got to above 10% utilization according to the task manager) does anyone have any idea what could be the problem?

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  • Identify OpenVZ virtual machine from inside

    - by Alfred Godoy
    Is there any way for me to identify which OpenVZ container I am in, from inside the container? I am working on a setup where OpenVZ machines shall boot the same (read-only) disk image, so I can not configure them individually in the file system. I need a unique identification for each of the virtual servers, to be used by scripts running inside the OpenVZ containers. (I'm running Debian Lenny, BTW.)

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  • How to increase the speed between two external hard drives on my laptop?

    - by Roman
    Hello, I own Sony Vaio Z laptop with two external USB ports. It's quite new and has USB 2.0 support. I'm using Vista x64 on it. I also have two external usb hard drives, Iomega 500GB and WD for 1TB. Every hard drive has USB 2.0 support. I connect two devices to my laptop and trying to copy date from one hard drive to another. But it takes a lot of time! The speed is about 15 Megabytes per second. I have to wait toooooo long to copy all the information from one hard drive to another. When I try to copy information from my internal (SSD) hard drive, it works fine for both external drives. The speed is very high and it shows me something about 100 Megabytes per second. It makes me feel that USB 2.0 is OK on both drives. But when I'm trying to copy from one external drive to another external, I still get very low speed. I checked out Device Manager and here is the settings I have: (sorry, can't upload image because of my rating, check this url: http://picbite.com/image/122073daljo/ ) I think it's because two of my external drives use the same USB 2.0 controller. Is there any way to make it work faster? Is it possible to move one of my USB ports to other USB 2.0 controller? Or is there any software which can help me to automate copying all the files thru my internal drive? I have only about 3 gigabytes free space on internal drive and it's quite difficult to move manually every file from one hard drive to internal and then again to another internal.

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  • How to increase the speed between two external hard drives on my laptop?

    - by Roman
    Hello, I own Sony Vaio Z laptop with two external USB ports. It's quite new and has USB 2.0 support. I'm using Vista x64 on it. I also have two external usb hard drives, Iomega 500GB and WD for 1TB. Every hard drive has USB 2.0 support. I connect two devices to my laptop and trying to copy date from one hard drive to another. But it takes a lot of time! The speed is about 15 Megabytes per second. I have to wait toooooo long to copy all the information from one hard drive to another. When I try to copy information from my internal (SSD) hard drive, it works fine for both external drives. The speed is very high and it shows me something about 100 Megabytes per second. It makes me feel that USB 2.0 is OK on both drives. But when I'm trying to copy from one external drive to another external, I still get very low speed. I checked out Device Manager and here is the settings I have: (sorry, can't upload image because of my rating, check this url: http://picbite.com/image/122073daljo/ ) I think it's because two of my external drives use the same USB 2.0 controller. Is there any way to make it work faster? Is it possible to move one of my USB ports to other USB 2.0 controller? Or is there any software which can help me to automate copying all the files thru my internal drive? I have only about 3 gigabytes free space on internal drive and it's quite difficult to move manually every file from one hard drive to internal and then again to another internal.

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  • HP Smart Array p400i with Intel X25-M 160 SSD

    - by user67304
    I have a pair of x25-M 160 Intel SSD's in an HP DL360 G5 with a p400i Smart Array running 512 BBWC. The disk performance I am getting on this box and another identical one does not come close to matching the same two drives running through a cheap 3ware RAID card. Any idea? I have played with the cache settings, but nothing allows me to get the same results. It seems like the Smart Array controller is the bottleneck.

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  • Read NTFS partition on RHEL 5.8

    - by Alex Farber
    I have RHEL 5.8 64 bit, and NTFS partition on the same disk. How can I get access to this partition? This answer Unable to mount NTFS drive with RHEL 6 doesn't work for me: [root@localhost alex]# rpm -Uvh http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm Retrieving http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm error: skipping http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm - transfer failed - Unknown or unexpected error

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  • Certificates required for WHQL-certified drivers

    - by Kasius
    The 64-bit Windows 7 image that we deploy to machines at our site does not contain all of the certificates included on a default Windows image. Automatic root certificate installation is also disabled per policy from higher in the organization. We have had a lot of trouble installing many WHQL-certified drivers from reputable companies (ex. HP, Lexmark, Dell, etc.), and I hypothesize that a required certificate is missing from one of the certificate stores on the machine. The error we typically get is: The driver cannot be installed because it is either not digitally signed or not signed in the appropriate manner. I know that it is signed. A .CAT file is included, and it has the following tree from top to bottom: Microsoft Root Authority (thumbprint a4 34 89 15 9a 52 0f 0d 93 d0 32 cc af 37 e7 fe 20 a8 b4 19) Microsoft Windows Hardware Compatibility PCA (thumbprint 93 b8 d8 82 0a 32 db 20 a5 ea b6 8d 86 ad 67 8e fa 14 ea 41) Microsoft Windows Hardware Compatibility Publisher (thumprint b0 50 45 45 42 4e be 2c 16 2f 62 5b bf 5a e6 9b 96 bf 0b 0b) What certificates are required to install WHQL-certified drivers? Is it possibly something other than certificates? Thanks! NOTE: I have posted this question on Technet as well, but honestly, I've never had a lot of luck posting questions on the Technet forums.

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  • Ram cache on Windows Server 2008

    - by Jonas Lincoln
    Scenario: We have a file cluster on a UNC share. A couple of IIS web servers serve files from this UNC share. This is done through a IIS-module, and this module does not use the built-in IIS-caching feature. We'd like to cache the files from the UNC share in a ram disk. So far, we've found this product: http://www.superspeed.com/servers/supercache.php Are there other products that can help us cache the files from the UNC-share in ram?

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  • Acer Aspire 5315 Boot order doesn't show CD-ROM

    - by Shaik
    Hi, I have an ACER ASPIRE 5315 laptop. I want use the recovery disk but, the boot manager does not show the CD-ROM bootable option. In the BIOS settings the I set the boot priority to USB CD-ROM first and then the harddrive. But its not working. When I press F12 the boot manager doesnot show the USB CD-ROM device. Please assist. Thanks in advance, Shaik

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  • Bacula backup process always blocks the restore

    - by georgehu
    Every day we have a long running catalog backup process, and I found there is no way to restore a file during the backup. So, Bacula is designed to block the restore while back is running? I'm using a disk backup, I couldn't understand why I can't restore file from early written volumes as the back process is not supposed to writing on the same volume file.

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  • Resizing an existing linux partition during Ubuntu install

    - by Richard100
    Hello All, I have Fedora Core 10 installed on a PC, occupying the whole disk (no free space). I want to add Ubuntu 10.04 desktop edition. Does Ubuntu 10.04 allow you to resize existing partitions during the installation process in order to free up some space for the Ubuntu installation? Without losing or trashing existing data, obviously. Thanks.

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  • file saving problem into the network

    - by santosh
    i have a problem when i save the office file in to the server through the client its show you it is read only file & also shows the disk is full or write protected what have to for this problem please give me the seggstion if have

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  • WindowsXP with no drivers

    - by user38008
    So I formatted my windows XP and reinstalled it. But forsome reason my drivers disk is for the wrong Dell Model..... So I can't connect to the internet because I think I'm missing the ethernet driver. Am i screwed or can I obtain theses drivers elsewhere....

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  • backup linux that installed inside windows.

    - by behrooz
    I have Ubuntu 10.04 inside windows vista. I'm going to install Windows seven but i don't want to loose all the softwares i have downloaded. how can i backup my Linux in an external device(HDD, DVD ...) and take it back to my hard-disk(I want to install it outside the windows if possible) Is there any software doing this for me?

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  • Sync desktop Mac environment to laptop

    - by Andrew Vit
    I spend the majority of my time working at my desktop Mac, which I have configured for my web development environment. My spouse has a MacBook for casual use, and I occasionally steal it back when I need to work off-site, or when travelling. The question is how to best synchronize the two so I can switch between them more readily. I've solved a few obvious things by using online services: Email is hosted on IMAP. Working files are in Dropbox. Source code is managed in git. However, the following are things I always miss when jumping on the laptop: Installed Applications (current versions) Installed libraries & utilities (/usr/local) Apache VirtualHosts & other configurations (/etc) Disk image files for VMs My current method is to connect the MacBook via Firewire target mode and rsync the /Users/me home directory, and then cherry-pick the other items I need from Applications, /etc and /usr/local. The problem with this method is that it can be very time consuming due to things like my virtual machine image files, cached emails, etc. How can I make this faster & easier? Can you recommend a solution for configuration management (so I can repeatably install & configure the same software on both), or synchronization (so I can bring the MacBook up to date nightly, over our home network)?

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  • How do I calculate the cost of printing a given page?

    - by Alenanno
    I have seen questions like How much does a square inch of ink cost and How much more will a high-dpi image cost to print?, but mine isn't asking neither about a specific case, nor about how much something costs, as that would depend on the toner, for example. Rather, I was wondering how should I go about calculating the cost of printing a given page. Note that "given page" should be seen as a sort of x, i.e. the answer should be applicable in any case; I'd like this question to provide a good reference for those who want to calculate this cost. What should be taken into consideration? The cost of a single page (the paper only) is easily checkable, since you divide the cost of the whole package for the number of pages in the package itself. But how do I calculate the cost of the ink/toner? Which could translate to: how do I calculate the Ink Density1 for a given printer? I know it depends on quality of the printer itself, the type, the quality of the image being printed, the very nature of what I'm going to print, etc. But again, the focus of my question is not on the variables of this case, but rather the constants, hoping the math simile works for this case too. 1: Total amount of ink in one area of the page.

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  • Which AMI to to use for Java/Tomcat/MySQL in Amazon EC2?

    - by Justin
    I originally posted this on stackoverflow.com and it was suggested serverfault.com might be a better place to ask this question. So here goes: I'm trying to determine which Amazon Machine Image (AMI) to use as my Virtual Server in Amazon's EC2. For now, I'll need to choose an AMI that complies with the AWS Free Usage Tier. I want to deploy a Java app that I've been developing using Eclipse on Windows XP, Tomcat 7 and MySQL 5.5. I'm aware that I can choose the Basic 32-bit Amazon Linux AMI. Then I'd manually install Tomcat and MySQL (does MySQL get installed on the image or separately on an Elastic Block Store (EBS)?). Here's the rub, I'm a bit of a Linux noob. I can start Tomcat and tail the logs and such on Linux but I'm not familiar with the install process for Tomcat and MySQL on Linux and commands like sudo and chmod. I'm happy to get more hands on with Linux but I'm short on time right now. Are there AMI's that already have Tomcat and MySQL bundled? The Request Instance Wizard shows 805 Community AMI's that are Free Tier Eligible. 51 of the Free Tier Eligible AMI's have "Tomcat" in their name. I'm willing to consider using Elastic Beanstalk but my research thus far hasn't found any discussion of using MySQL with Beanstalk. The discussions all seem to use Amazon's SimpleDB. Any advice is greatly appreciated.

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  • How do I restore my audio after uninstalling Ventrilo?

    - by Marcx
    Hi, I've a Dell studio 1555 bought on september with Windows 7 64bit Professional on it. The audio device works proprerly, while listening to audio contents (from disk or internet) When I use Ventrilo, the audio from other people sounds good and I hear their voices clearly When I use any other VOIP programs like Teamspeak 3, MSN or Skype, I hear a disturbed voice, and it's impossible to comprehend something... Anyway everything worked fine until I installed Ventrilo, but removing it didn´t solve my problem. So how do I restore my audio?

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