[Bug 573477] Re: Mdadm array fails to assemble on boot.

[Chauncellor]

Thank you for your bug report. To maintain a respectful atmosphere,
please follow the code of conduct -
http://www.ubuntu.com/community/conduct/ . Bug reports are handled by
humans, the majority of whom are volunteers, so please bear this in
mind.

Kindly refrain from clogging up various bug reports with threats about
leaving Ubuntu, michael. Your input is valuable if you can help solve
the solution and is useless with empty rants.

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https://bugs.launchpad.net/bugs/573477

Title:
  Mdadm array fails to assemble on boot.

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mdadm

  On boot I receive a message stating 'the disk for/mnt/md0 is not ready
  yet or not present. Continue to wait; or Press S to skip mount or M
  for manual recovery'. If i press M and try 'mount -a' it states that
  'special device /dev/md0 does not exist'. If I try 'mdadm --assemble
  --scan' it states 'no devices found for /dev/md0'. If I skip the
  mounting of the array, and start the array then mount it through
  palimpsest everything mounts as should be (devices in array and mount
  location).

  Output of 'mdadm -D /dev/md0'

  /dev/md0:
          Version : 01.02
    Creation Time : Mon Nov 16 12:30:36 2009
       Raid Level : raid5
       Array Size : 1465151424 (1397.28 GiB 1500.32 GB)
    Used Dev Size : 976767616 (931.52 GiB 1000.21 GB)
     Raid Devices : 4
    Total Devices : 4
  Preferred Minor : 0
      Persistence : Superblock is persistent

    Intent Bitmap : Internal

      Update Time : Sun May  2 15:58:29 2010
            State : active
   Active Devices : 4
  Working Devices : 4
   Failed Devices : 0
    Spare Devices : 0

           Layout : left-symmetric
       Chunk Size : 64K

             Name : :raid5
             UUID : 02bcfe3b:44fc949f:f5f7e481:a421a2c0
           Events : 55496

      Number   Major   Minor   RaidDevice State
         0       8       49        0      active sync   /dev/sdd1
         1       8       33        1      active sync   /dev/sdc1
         2       8       17        2      active sync   /dev/sdb1
         4       8        1        3      active sync   /dev/sda1

  
  Contents of /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 server

  # definitions of existing MD arrays
  ARRAY /dev/md0 level=raid5 metadata=1.2 num-devices=4 UUID=02bcfe3b:44fc949f:f5f7e481:a421a2c0 name=md0

  # This file was auto-generated on Sat, 01 May 2010 18:15:04 +1000
  # by mkconf $Id$

  
  Contents of /etc/fstab

  # /etc/fstab: static file system information.
  #
  # Use 'blkid -o value -s UUID' to print the universally unique identifier
  # for a device; this may be used with UUID= as a more robust way to name
  # devices that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  proc            /proc           proc    nodev,noexec,nosuid 0       0
  # / was on /dev/sda1 during installation
  UUID=906694f9-9425-4ae3-88cc-bd9f4161846b /               ext4    errors=remount-ro 0       1
  # swap was on /dev/sda5 during installation
  UUID=01cb5d34-e4ac-4329-95c1-e9396a414a28 none            swap    sw              0       0
  #mdadm array
  /dev/md0	/mnt/md0	auto	defaults	0	0

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