Migrated two drive RAID 1 array (1.2 metadata) to larger drives (larger gpt partitions)
Followed steps on https://raid.wiki.kernel.org/index.php/Growing
Before using mdadm --grow, the system reliably booted for months, automatically discovering, mounting md.
Noticed one of next two steps involved fsck. I understand fsck should be performed on unmounted filesytem. So, changed to runlevel 1 with init 1 and unmount md.
Ran mdadm --grow --size=max on unmounted md. Command exited normally. Ran fsck and resize2fs. Commands exited normally. Mounted md and verified file system contents.
Did same steps for another md and restarted services with CTL+D. Noticed resync taking place using Disk Utility. After resync completed, NFS service froze, so decided to test reboot.
The two Expanded md (/var and /home) are no longer automatically assembled by kernel. The md can be assembled by using mdadm --assemble.
Is there a way to get the two Expanded md to auto assemble again?
Tried using mdadm --create with one drive, but could not mount md (error message). Guessing it needs formatting after --create?