I'm running ubuntu 12.10. I've set up raid5 using 3 HDDs:
/dev/sdc. However on every boot I get this screen:
raid level 5 active with 2 out of 3 devices, algorithm 2, warning: there appears to be one or more degraded devices".
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
So far I've tried adding
bootdegraded=true to kernel options which makes boot succeed but with some errors on boot but raid volume is mounted. I've also tried changing
/dev/md127 /data auto defaults,user,owner 0 2
/dev/md0 doesn't actually exist on my system. I've also tried changing the
/etc/mdadm.conf last line to:
ARRAY /dev/md0 level=raid5 num-devices=3 metadata=1.2 name=bluelady:0 UUId=blahblahblah
Obviously the UUID is correct. I've just not typed it out here.
I've also noticed that there is an open bug on this subject: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/990913.
I can mount the raid array once booted in but on boot it has issues.
Is this a known issue? If not what can I try to fix this issue?