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

[Phillip Susi]

On 5/26/2011 5:24 PM, Jim Moseby wrote:
> I assume a fresh install of Natty on this server would result in a
> unbootable brick, everything else being equal.  Or would a fresh install
> also fix the metadata?

Yes, a totally fresh install ( and building a new raid array ) of Natty 
should work since the default metadata format is now 1.0.

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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.