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Thread: mdadm.conf missing details?

  1. #1
    Join Date
    Jun 2010
    Beans
    30

    mdadm.conf missing details?

    Someone in the IRC help channel suggested that I backup my mdadm.conf file for a software RAID5 array before upgrading to 12.04. I looked in /etc/mdadm/mdadm.conf and saw literally no reference to my array mounted as md0. So I ran a command I found in the wiki for generating this file: mdadm --detail --scan >> /etc/mdadm/mdadm.conf. My conf files now look like this:

    /etc/mdadm.conf
    ARRAY /dev/md0 metadata=1.2 spares=1 name=MediaNew:0 UUID=c922382d:a8decfb4:0bdbd2de:67332819
    /etc/mdadm/mdadm.conf
    # mdadm.conf
    #
    # Please refer to mdadm.conf(5) for information about this file.
    #


    # by default, scan all partitions (/proc/partitions) for MD superblocks.
    # alternatively, specify devices to scan, using wildcards if desired.
    DEVICE partitions


    # auto-create devices with Debian standard permissions
    CREATE owner=root group=disk mode=0660 auto=yes


    # automatically tag new arrays as belonging to the local system
    HOMEHOST <system>


    # instruct the monitoring daemon where to send mail alerts
    MAILADDR root


    # definitions of existing MD arrays


    # This file was auto-generated on Sat, 31 Dec 2011 19:00:57 -0600
    # by mkconf $Id$
    ARRAY /dev/md/0 metadata=1.2 name=MediaNew:0 UUID=e8556bbd:4885837b:be8c7739:408cfb8d
    From what I'm seeing of example conf files, there should be entries for each of the drives making up this array. But I don't see anything like that.

    Am I doing something wrong generating this file?

  2. #2
    Join Date
    Sep 2008
    Location
    Netherlands
    Beans
    369
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: mdadm.conf missing details?

    The UUID identifies the array members.
    Use the mdadm examine command at the members and you'll see the UUID appearing there.

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