Here's what the mdadm documentation says:
When a version 0.90 array is being reshaped (e.g. adding extra devices
to a RAID5), the version number is temporarily set to 0.91. This
ensures that if the reshape process is stopped in the middle (e.g. by a
system crash) and the machine boots into an older kernel that does not
support reshaping, then the array will not be assembled (which would
cause data corruption) but will be left untouched until a kernel that
can complete the reshape processes is used.
So simply waiting would have been enough to work around this, but GRUB
ought to recognise this format anyway since I *believe* it's equivalent
to 0.90 for the purposes of reading.
** Changed in: grub2 (Ubuntu)
Importance: Undecided => Medium
** Changed in: grub2 (Ubuntu)
Status: New => Triaged
** Summary changed:
- error: unsupported RAID version: 0.91.
+ Support mdadm metadata version 0.91 (used during reshape)
--
Support mdadm metadata version 0.91 (used during reshape)
https://bugs.launchpad.net/bugs/645608
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