It took me awhile to figure out that one of my SATA ports on a Silicon Image card was the source of some unstable behaviour my box had been exhibiting. I had a few lock ups and i had to power button shutdown a few times. I am running RAID5 with 3 disks.
I move the disks around on the controller and currently the fault port is unused. The instability is no longer there and I attempted to recover the RAID. OMV was no longer showing the raid so did:
mdadm --assemble --force /dev/md127 /dev/sd[abc]This assembled the raid without disk sda which I had to re-add which then start recovery of the RAID. I allowed that to run overnight but this morning I noticed the RAID was in the state below.
I am not sure why drive sda is showing up as a spare or even how to make it active.
I have gotten to this point. I am not sure what the next steps are. Any ideas?
root@oracle:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] id10]
md127 : active raid5 sdc[0] sda[3] sdb[1]
976770048 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/
unused devices: <none>root@oracle:~# mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Mon Nov 26 20:20:33 2012
Raid Level : raid5
Array Size : 976770048 (931.52 GiB 1000.21 GB)
Used Dev Size : 488385024 (465.76 GiB 500.11 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Fri Dec 14 09:53:09 2012
State : clean, degraded
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Name : oracle:storage1 (local to host oracle)
UUID : e4bc19e4:a21d40b4:7d72c930:6ed8bf43
Events : 6894
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 16 1 active sync /dev/sdb
3 8 0 2 spare rebuilding /dev/sda