ESP is also on RAID1 with 0.90 meta.
# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Tue Aug 16 11:08:49 2016
Raid Level : raid1
Array Size : 266176 (259.98 MiB 272.56 MB)
Used Dev Size : 266176 (259.98 MiB 272.56 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Nov 18 15:10:03 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 8738f3e7:91896e1d:e368bf24:bd0fce41
Events : 0.23
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
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https://bugs.launchpad.net/bugs/1466150
Title:
grub-install breaks when ESP is on raid
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