Well, it’s not looking good.
Twice now it’s failed during the rebuild process, leaving me with:
~ $ mdadm -D /dev/md2
/dev/md2:
Version : 00.90.01
Creation Time : Fri Apr 3 13:54:17 2009
Raid Level : raid5
Array Size : 5854981248 (5583.75 GiB 5995.50 GB)
Device Size : 1951660416 (1861.25 GiB 1998.50 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Fri Apr 29 14:17:52 2011
State : clean, degraded
Active Devices : 2
Working Devices : 3
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : b2c561ae:9acfcff0:2594d787:fb4eb047
Events : 0.4283852
Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 0 0 1 removed
2 8 36 2 active sync /dev/sdc4
3 0 0 3 removed
4 8 20 - spare /dev/sdb4
5 8 52 - faulty spare /dev/sdd4
Any suggestions (and thanks for the typo pickup earlier…)