Ubuntu Server 10.04 - Software raid without touching OS hdd

Discussion in 'Installation/Configuration' started by Martinss, Feb 16, 2012.

  1. Martinss

    Martinss New Member

    Hello, I have a question about ubuntu server 10.04 software raid with MDADM.
    I have server with 3 hdd's. First one, where is OS located (160gb) and two hdd's (500gb each) which I want to put in RAID1. I don't want to touch anything on my OS hdd, so what should I do different in this tutorial to put only my 500gb hdds in RAID1? I'm asking here, because I am afraid to mess things up if I directly follow that tutorial.

  2. falko

    falko Super Moderator ISPConfig Developer

    Let's assume your two 500GB HDDs are named /dev/sdb and /dev/sdc.

    First your format /dev/sdb with fd (Linux RAID Autodetect):
    fdisk /dev/sdb
    For example, if you create two Linux RAID Autodetect partitions on /dev/sdb (/dev/sdb1 and /dev/sdb2), you can set up RAID1 as follows:

    sfdisk -d /dev/sdb | sfdisk --force /dev/sdc
    mdadm --zero-superblock /dev/sdb1
    mdadm --zero-superblock /dev/sdb2
    mdadm --zero-superblock /dev/sdc1
    mdadm --zero-superblock /dev/sdc2
    mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sdb1 /dev/sdc1
    mdadm --create /dev/md1 --level=1 --raid-disks=2 /dev/sdb2 /dev/sdc2
    Afterwards you can create file systems on /dev/md0 and /dev/md1 and mount them (you might also want to add them to /etc/fstab).

    Finally run
    cp /etc/mdadm/mdadm.conf /etc/mdadm/mdadm.conf_orig
    mdadm --examine --scan >> /etc/mdadm/mdadm.conf
  3. Martinss

    Martinss New Member

    Thanks for help! Soon I will get my second hdd and try it out. :)

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