Follow-up Comment #8, bug #39527 (project grub):
The message simply means that one disk in RAID is missing. You need to check
state of arrays using /proc/mdstat. After mdadm --remove you get degraded
array and this message is normal.
Note that your example does not work here. mdadm --grow -n 2 immediately
after mdadm --grow -n 1 fails as it should. You first need to add additional
(spare) disk and then you can grow array again. But if I reverse --grow and
--add I get healthy 2-disks array and no warning.
Please
- do whatever steps you did to reproduce it
- record output of "cat /proc/mdstat"
- run grub2-probe -t abstraction -d /dev/md0
If you get warning, show /proc/mdstat recorded above.
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