Configuring RAID 10 with RedHat ES 4 (64 bit)

From: Andy Mountford (andrew.mountford_at_gmail.com)
Date: 05/18/05

  • Next message: Burke, Thomas G.: "RE: MBR" 
    Date: Wed, 18 May 2005 10:57:49 +0100
To: redhat-list@redhat.com

    Hi,

    I am trying to configure an array of 12 disks in a RAID 10
    configuration. All 12 disks are identical 146Gb drives.

    First off, on each disk I created a single partition which spanned the
    whole disk with a system id of 0xFD. After writing the partition
    table, a print confirmed all looked good.

    Secondly, I used mdadm to create 6 RAID 1 pairs. (mirrored).

    mdadm --create /dev/md0 --level=1 -n 2 /dev/sda /dev/sdb
    mdadm --create /dev/md1 --level=1 -n 2 /dev/sdc /dev/sdd
    mdadm --create /dev/md2 --level=1 -n 2 /dev/sde /dev/sdf
    mdadm --create /dev/md3 --level=1 -n 2 /dev/sdg /dev/sdh
    mdadm --create /dev/md4 --level=1 -n 2 /dev/sdi /dev/sdj
    mdadm --create /dev/md5 --level=1 -n 2 /dev/sdk /dev/sdl

    cat /proc/mdstat showed the devices syncing. Once this had completed I
    created a final meta device which striped the RAID1 meta devices. e.g.

    mdadm --create /dev/md6 --level 0 -n 6 /dev/md0 dev/md1 dev/md2
    dev/md3 dev/md4 dev/md5

    I could then create a filesystem on the new array and mount it - all
    looked good. However, 2 things concerned me:

    1. After creating the RAID array, the partition table for all the
    disks involved was empty and an fdisk returned:

    "Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)"

    What's going on here?

    2. How can I get the array to come up after a reboot? What needs to be
    done? Do I need an rc script that runs mdadm?

    Thanks,

    Andy 

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