I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system.
I now seem to have two RAID volumes, as reported by:
# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc 2096116 blocks super 1.2 [2/1] [_U] md127 : active (auto-read-only) raid1 sdb 2096116 blocks super 1.2 [2/1] [U_] unused devices: <none>
Not exactly sure where to go from here. How can I merge and re-sync these volumes without data loss?