[Bug 776422] Re: [Natty] Grub no longer recognizes raid5 array

[Jim Moseby]

I have an ubuntu server that was nagging me to do a dist upgrade, and so
I did.  When I saw the "error: Found two disks with the index 0 for RAID
md0" I started searching and found this bug.  I am now unsure how to
proceed.

-  Is there any word on a resolution for this problem?  
-  If my server restarts will it be unable to boot?
-  Is there any interim  workaround?  
-  Will reverting back to an older version of grub resolve this until a solution is found?

Thanks.

-Jim

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https://bugs.launchpad.net/bugs/776422

Title:
  [Natty] Grub no longer recognizes raid5 array

Status in “grub2” package in Ubuntu:
  Opinion

Bug description:
  Binary package hint: grub2

  After upgrading from Maverick to Natty, grub drops to the rescue shell
  complaining about the raid5 array.  It says:

  error: Found two disks with the index 0 for RAID md0
  error: Found two disks with the index 1 for RAID md0
  error: Found two disks with the index 2 for RAID md0
  error: Superfluous RAID member (4 found)
  error: Unknown filesystem

  This is a 4 disk raid5 array that mdadm still recognizes and looks
  fine, with each disk having IDs 0 through 3 respectively.  Despite the
  fact that it complains about the raid, it still shows the LVM logical
  volumes in the output of ls.  The array is the sole LVM PV.