I new system was built today and I don't understand why the drives are
out of order. I don't think it matters but I wanted to ask here. I am
100% sure I specified /dev/sdd2 to be my spare device but when I now
check mdadm, it does not appear this way...
[root@tuna ~]# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Jan 28 06:59:49 2010
Raid Level : raid5
Array Size : 480391552 (458.14 GiB 491.92 GB)
Used Dev Size : 240195776 (229.07 GiB 245.96 GB)
Raid Devices : 3
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Jan 28 13:50:40 2010
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : c935f1cc:af72fc84:c89aa428:f91eeb1b
Events : 0.471
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
2 8 50 2 active sync /dev/sdd2
3 8 34 - spare /dev/sdc2
As you can see it has my /dev/sdc2 instead of /dev/sdd2 as my spare.
The problem is the drives are physically labeled on the chasis and I
was wondering why it did this and also can it be fixed. Can I move
/dev/sdd2 from number '2' position to my spare and then move /dev/sdc2
as an active member of the raid? The /dev/md0 is my entire / partition
so anything that requires me stopping the RAID becomes a little
difficult.
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