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  • Software RAID 10 on Linux

    - by vpetersson
    For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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  • Flexible virtualization infrastructure Design with libvirt

    - by Lessfoe
    I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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  • How small is too small (of laptop for a programmer)

    - by defn
    Im thinking of replacing my HP Pavilion dv5-1004nr with Acer Aspire AS5738-6444, I'm a CS student... so im torn between screen size (liking the 15in and decent gpu.. but it weight nearly 8 pounds and battery can barely last 2 hours in power saver mode) and wanting something portable to carry to classes/take notes ect (3 pounds and up to 8 hour battery life of the acer) what would you guys suggest? acer any good? i love my hp keyboard.. (or have links to other good laptops, im aiming for 600$ range?)

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  • Unix Server Partitioning & Filesystem Layout

    - by user1717735
    There's a lot of contradictory information about Unix server partitioning out on the internet, so I need some advice on how to proceed. So far, on the servers I in our test environment I didn't really care about partitioning and I configured a single monolithic / plus a swap partition. This partitioning scheme doesn't seem like a good idea for our production servers. I have found a good starting point here, but it seems very vague on the details. Basically I have a server on which I will be running a basic LAMP stack (Apache, PHP, and MySQL). It will have to handle file uploads (up to 2GB). The system has a 2TB RAID 1 array. I plan to set : / 100GB /var 1000GB (apache files and mysql files will be here), /tmp 800GB (handles the php tmp file) /home 96GB swap 4GB Does this sound sane, or am I over-complicating things?

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  • Snow Leopard Servers built in Wiki vs Mediawiki?

    - by semi
    I recently installed Snow Leopard Server and am trying to get the most out of the services it offers, but one thing that currently seems pretty barebones is the Wiki it provides. Can Snow Leopard Servers wiki be modified with plugins the way MediaWiki can? Are there any good plugins to allow you to include templates like MediaWiki? Is there any way to include embeded syntax highlighted example code? Is there even a good name to refer to it as when searching for it? "Snow Leopard Wiki" just turns up a bunch of wikis about SL. Alternatively, how hard is it to install MediaWiki(or some other more advanced wiki engine) on SL Server? Could you plug it in to the same authentication mechanism?

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  • what is mda (fetchmail) and mta (sendmail)?

    - by ajsie
    i have read some articles about mda and mta but still don't have a hang on it. what is exactly is the difference between a mda like fetchmail and a mta like sendmail. in my computer, do i have to have a mta installed? if im using Apple Mail to send messages, is it using a mta application in my computer to send the mail? where does it send the mail? and if i receive mails with it, does it receives it with mda installed in my computer? would be great if someone could explain how it works for me, or give me good links to good tutorials. thanks

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  • Software to copy non-duplicate files from CD/DVD

    - by John22
    I have several CDs/DVDs which have partially overlapping content (the overlapping files are identical, but have different names), and some of the files are on my hard disk. I need to get the remaining unique files copied to my hard disk. I found a really good duplicate file finder, Duplicate Cleaner, which lets you select multiple folders and then finds duplicates by checksum (or file name, size, date) and is very fast, and free. It won't help me do what I want though, unless I just copied everything, and then deleted the duplicates - but I would have to do multiple cycles, as I don't have room to copy all the CDs/DVDs to my hard disk. I found a couple of file sync programs, but they don't have the compare function - the file names must match. (I tried other duplicate file finders on CNET, but they aren't as good as Duplicate Cleaner, and also don't have the functionality I need.) Thanks for any help.

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  • Apache + SuExec + php-fpm - how to set them up?

    - by FractalizeR
    Hello. I wonder if there is a good guide on how to setup Apache + SuExec + php-fpm? I have a server which I am going to use several separate website. So, I need php to be run as site-owner user. As I can see, php-fpm is a little different from php-fcgi. Is there a need in mod_fcgid from Apache in this case? How to set this all up? For now my site is running Apache + mod_suphp + php-cgi, so... it's good, but a little slow. I want to preserve security and gain an ability to use APC.

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  • Building a DVR system for use with custom windows application (video analytics)

    - by Michael
    Is there a good PCIe DVR capture card that has at least 4 channels as well as the hardware encoding? It would have to have decent driver support in Windows xp or windows 7. I have looked at various video capture cards as well as an integrated video capture card/motherboard from Huperlabs. But so far I have not found one with a decent review and that has good driver support that I can verify. A really small card would be nice because I am trying to get a fairly small form factor. Huperlabs stuff is pretty awesome but they are slow to get back to me and they bundle their analytics software with the hardware (extra cost for nothing) The dvr is being used for security.

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  • Most efficient way to use a laptop like a desktop? [closed]

    - by user74757
    When I'm at home (which is the vast majority of the time now in Summer), I rarely use my laptop away from my desk. When it is at the desk, I plug in a monitor through HDMI, a power cable, and a mouse and keyboard that always stay there. I was wondering if anyone had any recommendations as to a good dock or product that does a good job of transforming a laptop into a true "desktop replacement." Ideally, it would allow all the connections to remain in place, with minimal effort to take the laptop in and out of the fixture. Thanks for any suggestions!

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  • SAN cache memory upgrade

    - by Scott Lundberg
    We currently have an IBM DS4300 Dual Controller Fibre SAN. It is a good box, but getting pretty old. It came with 256MB of cache per controller. Recently we replaced the batteries in one of the controllers and noticed that the cache is a DDR PC2100 ECC DIMM. Of course, we are thinking about how cheap this RAM is now and is there any good reason we can't upgrade the RAM. IBM used to have a "Turbo" upgrade to this box that doubled the cache and had a bunch of software features for about 10K USD. Since that product has been end-of-lifed, I don't think we can get that upgrade and we don't need the software upgrades (FlashCopy, StorageCopy, etc). Besides the obvious potential warranty issue, what if any issues would we expect to see if attempting to put 2 - 1GB DIMMS in this unit? Any other things I am missing here? EDIT: Memory label: Samsung CN 0433 PC2100U-25331-A1 M381L3223ETM-CB0 256MB DDR PC2100 CL2.5 ECC

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  • Linux webserver tutorials (WordPress)

    - by HannesFostie
    Hi I will be setting up a linux webserver to host WordPress on. The problem is that although I know how to do it, I don't know how to properly do it. So I'm now looking for semi-advanced tutorials that are complete and secure above anything else. I don't really mind trying a new distro, but I prefer ubuntu/debian. I read this post: Any good resources for setting up a webserver in Linux ? But these are very limited. So far not a lot of luck finding good guides and howtos. This should probably be a community wiki but I can't seem to transform it myself. Thanks

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  • IT Audit checklist

    - by PHLiGHT
    I recently have taken on the position of a one man show for a company that is going to have an audit. The network isn't anywhere close to prepared and I have been looking for a general audit checklist since one hasn't been provided by the auditors and haven't found much good information out there. Does anyone have a nice template that will give me a good starting point. I know that this will be highly customized to the company but a starting point will be helpful to outline to management just how much work is needed. Thanks,

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  • windows server 2008 vs ubuntu 11 [closed]

    - by user472875
    I am working on implementing a custom server application that should be capable of handling a very large volume of traffic. I am aware that this type of question has been asked a lot, but I haven't been able to find a good answer. What I'm really looking for is for a server with given specs which OS will be able to handle a larger traffic faster and more reliably. I do not care about rights management or any other features. I am fairly good with both platforms, and so I would like to pick the OS with better performance on a clean install, and with nothing else running. Thanks in advance.

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  • Windows 7 Audio problem..

    - by Marcx
    hi, I've a dell studio 1555 bought on september with Windows 7 64bit Professional on it. Audio devide works proprerly, while listening/watching audio/video contents (from disk or internet) Using VoIP Program Ventrilo Audio from others people works good, and I hear their voices clearly... Using VoIP Program such as Teamspeak 2/3, MSN, Skype I hear a really disturbed voice, and it's impossible to comprehend somethings... Anyway I can say that the first week that I've bought and installed Win7 Skype worked good, this problem happened after I installed Ventrilo... I tried to remove it (ventrilo) but nothing happened:( Please help me :D Thanks Marcx

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  • Open-source training class/room/instructor resource management software?

    - by Kyle Eli
    We're looking to replace an internal system used for managing training classes with something a bit more robust. Needs to be open-source or have a license level that grants access to source, and needs to be ASP.net (C# preferred, but could live with VB.net) Ultimately, we'll need to be able to assign facilities and instructors, manage attendees, send notifications, and build calendar views. We'll also be integrating with our website to allow on-line sign-up and other things for attendees to manage on their own. We do expect to implement quite a bit of it in-house, but we'd like as broad of a base to start from as we can get. Still, just a really good web-based meeting-room reservation system might make a good enough starting point. In list form: Meeting/training resource management softwareASP.net (C# or VB.net)Source availableWe're expecting to have to modify the software to meet all of our requirements

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  • Pros/cons to turning off cable modem

    - by Jay
    A little off the wall perhaps, but ... I have a cable modem and a router for a wireless home network. Is it a good or a bad idea to turn it off at night and during the day when we're all at work or school? Or should I leave it on 24/7. I was thinking that leaving it on constantly makes me more vulnerable to hackers, not to mention wasting electricity. (Though I'd guess the amount of electricity used by a cable modem and a router is probably pretty trivial. Still, every little bit helps.) When I have turned it off and turned it on again, it takes several minutes for it to go through its little dialog with the cable company and get me connected to the Internet again, which is annoying but not a big deal. Anyone know any good reasons one way or the other?

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  • My computer keeps crashing and I just want it FIXED

    - by xabaddon
    So long story short, I had my brother build me a computer for my birthday last year. I saw how good his was (also built by him) so I decided I would have him build me one. About a month after this was all finished, my computer started crashing when I when run over 3 programs. For example, an online game, a music player (spotify), skype, and a browser with a few tabs open. The way it would crash is the screen will freeze and a buzzing noise will come from whatever audio device I am using (headset, speakers) I took it to a computer tech guy and he told me my cooling system was inadequate. SOOO he led me to buy a CORSAIR H75 Liquid cooling system. Everything was good for about a week, and now it just did the same thing again. I am so freaking over this guys and I really need some help figuring out what the heck is wrong, I dont care how long it takes, just please help me.

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  • Software for scanning installation process?

    - by no name
    I forgot what is the name of the very good software which make some kind of restore point (save registry, and program files folder, etc...) before installing any software. After you install some program (ie "Notepad++") you can easily see what registry data use new installed program, on what location are the file's is stored and many more. The reason that I'm asking for help is that I have to automate some installation of public software, so after installation I need to uninstall it, so i have to delete all junk files. The software is called something like install wizard, or wizard install I forgot. If you have any idea of other application that do same thing , or you know exactly name of that software, or you have some good idea how to solve easy solve many installation and uninstallation, please let me know. Os: win7/xp 64/32

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