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Ubuntu 8.10 and raid 0?

  • 13-01-2009 4:36pm
    #1
    elexes
    Registered Users, Registered Users 2 Posts: 4,471 ✭✭✭


    ive installed ubuntu onto some of my home computers and its doing everything i want well.

    but now i want to install it on my gaming machine and ive hit a wall on the first bit.

    my motherboard supports raid and i had 2 small raptor drives installed giving me a nice boot drive totalling 60 ish gigs of space. but i cant find how to install raid 0.

    has anyone managed it or have a link to a guide to do it ?

    new to Ubuntu so im trying to learn quick


Comments

  • #2
    ARGINITE
    Registered Users, Registered Users 2 Posts: 2,719 ✭✭✭ARGINITE


    Make and model of motherboard will help first.

    It really depends on weather the raid on the motherboard is implemented using software or hardware. Most of the time when you get raid on a motherboard it requires you to use a certain set of windows drivers for it to work correctly. Most of the time to get this to work in Linux is nearly impossible.


  • #3
    elexes
    Registered Users, Registered Users 2 Posts: 4,471 ✭✭✭elexes


    http://www.giga-byte.com/Products/Motherboard/Products_Overview.aspx?ProductID=2749

    GA-P35C-DS3R


    time to go looking for a stand alone raid controller then :(


  • #4
    Darr3nG
    Registered Users, Registered Users 2 Posts: 79 ✭✭Darr3nG


    It can be done, but isn't easy to implement.

    I've got it to run using gentoo, but ubuntu doesn't play as nice!

    The thing is, you have to set up a small RAID1 partition at the start of each drive for /boot - and compile RAID support into the kernel.


  • #5
    Orion
    Closed Accounts Posts: 12,807 ✭✭✭✭Orion


    Use mdadm for it. Don't use the motherboard RAID. PC RAID is fake raid - not true raid. Windows can accept it as RAID but Linux sees right through it.

    Here's a HOWTO - it has a good explanation of fake vs software raid as well.


  • #6
    CiaranC
    Closed Accounts Posts: 6,300 ✭✭✭CiaranC


    enix wrote: »
    http://www.giga-byte.com/Products/Motherboard/Products_Overview.aspx?ProductID=2749

    GA-P35C-DS3R


    time to go looking for a stand alone raid controller then :(
    A basic RAID card is about 10 euro from ebay.


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  • #7
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 94,360 Mod ✭✭✭✭Capt'n Midnight


    and don't forget it's called Raid 0 because that's the number of files you can recover if either drive dies.


  • #8
    ravydavygravy
    Registered Users, Registered Users 2 Posts: 545 ✭✭✭ravydavygravy


    Capt'n Midnight wrote: »
    and don't forget it's called Raid 0 because that's the number of files you can recover if either drive dies.

    :D


  • #9
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    Yes, but is the chance of loosing one drive in a raid 0 array any greater than the chance of loosing a single drive, (which most people depend on)? I mean, raid doesn't put any extra stress on a hd.

    I've got a similar problem, I've Vista on 2x hd's in raid 0, I've tried installing Ubuntu on another hd but I can't get in2 it when I reboot as it doesn't write to the Mbr and just boots to Vista. The latest Ubuntu is supposed to support dmraid but I get errors when I "sudo apt-get install dmraid" and then try to install. I've tried several times and can't get it to work. I've even tried easyBCD to write to the Vista loader and couldn't get that to work either. Ubuntu is installed on a seperate hd here and I can't get in2 it.


  • #10
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 94,360 Mod ✭✭✭✭Capt'n Midnight


    PogMoThoin wrote: »
    Yes, but is the chance of loosing one drive in a raid 0 array any greater than the chance of loosing a single drive, (which most people depend on)? I mean, raid doesn't put any extra stress on a hd.
    compared to two separate disks the chances of loosing data are twice as high and you would loose twice as much data.

    I would consider a factor of 4 to be significant

    and that's before you consider how much easier data recover is from a single disk than raid stripes


  • #11
    Orion
    Closed Accounts Posts: 12,807 ✭✭✭✭Orion


    I was about to reply saying RAID0 doesn't stripe - silly old me thinking at file level rather than block level. :D

    Capt'n is absolutely correct. I would never use RAID0 on a system that I keep critical data on. I was planning on using it on a NAS for media streaming - I can always rip those dvds again - but my primary PC is RAID1. Disk space is so cheap these days that there's little reason not to. I'm even thinking of buying another 750Gb disk and converting that RAID1 array to RAID5.
    RAID0: 750+750=750 with 0% fault tolerance.
    RAID1: 750+750=750 with 100% fault tolerance with 1 disk failing.
    RAID5: 750+750+750=1500 with 100% fault tolerance with 1 disk failing and then it's RAID1. So 200% fault tolerance :D


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  • #12
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    In my case I have nothing I can't affort to loose on the drive, Its just Vista without programs, games or documents (on other drives) and I have an Acronis image backed up which can be re-installed in 12mins. Its just a matter of imaging back on the partion and all my programs and games still work.

    @ OP, all those have criticised the use of raid 0, yet none have helped. Myself I have solved my dual boot problem, lots of probs but finally got it here. Using EasyBCD i added Intrepid to the Vista boot loader and now its dual booting fine. I reinstalled Intrepid in its own partion and forced grub to install there. Now the vista bootloader has an option for Intrepid which leads to grub and boots. I've edited /etc/grub/menu.lst down to 0 seconds so it barely flashes up.


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