Public bug reported:
grub2 appears to _sometimes_ ignore md devices with a hot spare:
$ cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
[raid10]
md5 : active raid1 sda2[2](S) sdb2[3] sde2[4]
2925939136 blocks super 1.2 [2/2] [UU]
bitmap: 2/22 pages [8KB], 65536KB chunk
md6 : active raid1 sdf2[0] sdd2[2](S) sdk2[1]
3902691136 blocks super 1.2 [2/2] [UU]
bitmap: 1/30 pages [4KB], 65536KB chunk
unused devices: <none>
$ sudo grub-probe -vvv / 2>&1 | grep -E 'info: Inserting md/|error'
grub-probe: info: Inserting md/6 (+0,7805382272) into systemvg (lvm)
grub-probe: error: disk
`lvmid/5R9E1M-V0xL-pEsR-74zV-3oOm-JorM-hb2Erw/WHUtMx-lZcd-2RmH-WVSk-Z0Et-qiqS-hFBd4u'
not found.
If I remove the hotspare from md5, everything works normally and I can
install grub again. But md6 has a spare too... ?!
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1912043
Title:
grub2 fails to install/probe into md device with hot spare
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