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Thread: Server 12.04.1 RAID with 4 disks

  1. #1
    Join Date
    Feb 2013
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    Server 12.04.1 RAID with 4 disks

    Hello,

    I'm trying to setup a NEW Ubuntu install with a raid configuration with 4 disks. I've previously setup a RAID-1 config with 2 disks.

    I've got two 1.5 TB Disks and two 80GB disks. I would like to know what kind of RAID I should use (RAID 5?) and how to partition the disks.

    Could anyone point me in the right direction?

    EDIT: I also have Intel Matrix, should I use that?
    Last edited by Lodododo; February 13th, 2013 at 12:52 PM.

  2. #2
    Join Date
    Nov 2009
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    Mataro, Spain
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    Ubuntu 14.04 Trusty Tahr

    Re: Server 12.04.1 RAID with 4 disks

    With disks of that size, there is not much you can do. RAID arrays are limited to the smallest member size, so if you create raid5 of all four disks, it will only have 80GB partitions as members.

    With mdadm SW raid you can use the rest of the 1.5TB disks but I don't see much point configuring it like that.

    Probably the best configuration is a raid1 array of the 80GB disks for the OS and some smaller data folders, and separate raid1 array of the big disks for the large data storage.

    Note that I am talking about SW raid. If you use HW raid or fakeraid I think it will use only 80GB of the big disks and you won't be able to use the rest.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 14.04 LTS 64bit & Windows 10 Pro 64bit

  3. #3
    Join Date
    Feb 2013
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    Re: Server 12.04.1 RAID with 4 disks

    Quote Originally Posted by darkod View Post
    With disks of that size, there is not much you can do. RAID arrays are limited to the smallest member size, so if you create raid5 of all four disks, it will only have 80GB partitions as members.

    With mdadm SW raid you can use the rest of the 1.5TB disks but I don't see much point configuring it like that.

    Probably the best configuration is a raid1 array of the 80GB disks for the OS and some smaller data folders, and separate raid1 array of the big disks for the large data storage.

    Note that I am talking about SW raid. If you use HW raid or fakeraid I think it will use only 80GB of the big disks and you won't be able to use the rest.
    Thanks alot

  4. #4
    Join Date
    Feb 2013
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    Re: Server 12.04.1 RAID with 4 disks

    Great, when I try to setup the raid configuration the SDB shows up, but the SDD doesn't, then I want to make a new partition and it says it's going to remove the raid devices, but it doesn't

  5. #5
    Join Date
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    Re: Server 12.04.1 RAID with 4 disks

    Make sure you have no fakeraid meta data on any disks. If they were used in raid earlier traces remain. It confuses the installer since it considers them part of raid. Formatting doesn't remove meta data.

    If you really have meta data on any disk, for example sdd, you can remove it from ubuntu live mode with:
    sudo dmraid -Er /dev/sdd

    PS. Are you talking about software raid or not?
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 14.04 LTS 64bit & Windows 10 Pro 64bit

  6. #6
    Join Date
    Feb 2013
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    Re: Server 12.04.1 RAID with 4 disks

    Quote Originally Posted by darkod View Post
    Make sure you have no fakeraid meta data on any disks. If they were used in raid earlier traces remain. It confuses the installer since it considers them part of raid. Formatting doesn't remove meta data.

    If you really have meta data on any disk, for example sdd, you can remove it from ubuntu live mode with:
    sudo dmraid -Er /dev/sdd

    PS. Are you talking about software raid or not?
    Thanks, fixed it.

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