Does this mean one of my HDDs has failed? How do I check if any of them are failing? I tried using smartctl and didn't see any issues. Or is it nothing to do with failure and something else altogether? I would like to get the raid 5 working again but I'm not sure where to go from here.
I'm using ubuntu 12.10 and the three raid disks each have a gpt partition with a single full size partition of filesystem type ext4. Note I only got an error on reboot not while I was creating the raid array which went fine.
I intended to use sda, sdb and sdc for the raid 5 array.
CREATE owner=root group=disk mode=0660 auto=yes HOMEHOST <system> MAILADDR root ARRAY /dev/md0 metadata=1.2 spares=1 name=bluelady:0 UUID=e0839614:9f79606f:75191039:19d511db
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active (auto-read-only) raid5 sda sdc sdb 7813774336 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_] unused devices: <none>
/dev/md0 /data auto defaults,user,owner 0 2