[Bug 999076] Re: mdadm 0.9 metadata at the end of the disk confuses grub

[Fabian Zeindl]

I still have troubles here. I found out something interesting: I used
zero-superblock with --force on the disk and the partition, and i used
dd to zero over the end of the partition and disks.

It works now, but when i add the spare-drive to the RAID i get the "error: found two disks with the index 4 for RAID md0." again.
When i remove the spare and zero the superblock, it works again.

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https://bugs.launchpad.net/bugs/999076

Title:
  mdadm 0.9 metadata at the end of the disk confuses grub

Status in GRand Unified Bootloader:
  Unknown
Status in “grub2” package in Ubuntu:
  Triaged

Bug description:
  When using mdadm metadata format 0.9 and the partition is at the end
  of the disk, grub can not tell whether it is the partition or the
  whole disk that is the raid component, resulting in errors like:

  error: found two disks with the index 0 for RAID md0.
  error: found two disks with the index 3 for RAID md0.
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).

  This can cause unexpected failure after upgrading from 10.04.

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