[Bug 776908] Re: mdadm RAID 1 fails to mount

[Austin Brashear]

Issue no longer occurs on my Oneiric machine. I ran an upgrade today and
now everything seems fine.

$ uname -a
Linux nas 3.0.0-12-generic-pae #19-Ubuntu SMP Fri Sep 23 23:10:56 UTC
2011 i686 i686 i386 GNU/Linux

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https://bugs.launchpad.net/bugs/776908

Title:
  mdadm arrays fail to mount

Status in “mountall” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mountall

  I have a RAID 1 partition across /dev/sdb3 and /dev/sdc3 which was
  created with mdadm in 9.10.  It worked fine through upgrades to 10.04
  and 10.10, but in 11.04 it fails to mount at boot time.

  I updated my /etc/fstab to account for the apparent device name change
  from /dev/md0 to /dev/md_d0 in 11.04.  This allowed me to mount the
  RAID partition manually, but it still does not mount at boot.  I get
  the error "The disk drive for /mnt/data is not yet ready or not
  present".  If I drop into the manual recovery shell, however, a "mount
  /mnt/data" succeeds.

  If I drop into the manual recovery shell, but exit without doing
  anything, the subsequent invocation of mountall still fails to mount
  the partition.  So it appears that this is not a timing issue.

  dmesg shows the RAID as active, with no errors, apparently before
  mountall is invoked.  /proc/mdstat concurs.

  mountall 2.25ubuntu1

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