Hi
I need to rebuild a 3-disk raid5.
One disk may be faulty (sda) ; one is good (sdd) and the other I think
is OK too (sdb).
The array dropped one disk (sda), then a short time later, another (sdb)
I mistakenly 'added' sdb back in which of course marked it as a spare.
This means that --assemble even with --force no longer works:
haze:~# mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.03
Creation Time : Sat Jun 11 23:12:06 2005
Raid Level : raid5
Device Size : 195358336 (186.31 GiB 200.05 GB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Sun Apr 2 08:35:50 2006
State : clean, degraded
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : 8d3c8cee:ef55096d:0f219d44:189f8912
Events : 0.1285185
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 0 0 - removed
2 0 0 - removed
3 8 17 - spare /dev/sdb1
A recent --detail whilst all was well gave:
/dev/md1:
Version : 00.90.03
Creation Time : Sat Jun 11 23:12:06 2005
Raid Level : raid5
Array Size : 390716672 (372.62 GiB 400.09 GB)
Device Size : 195358336 (186.31 GiB 200.05 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Mar 31 09:53:07 2006
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 8d3c8cee:ef55096d:0f219d44:189f8912
Events : 0.1269558
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 8 17 1 active sync /dev/sdb1
2 8 1 2 active sync /dev/sda1
and at the first failure I saw this in dmesg:
raid5: Disk failure on sda1, disabling device. Operation continuing on 2
devices
RAID5 conf printout:
--- rd:3 wd:2 fd:1
disk 0, o:1, dev:sdd1
disk 1, o:1, dev:sdb1
disk 2, o:0, dev:sda1
RAID5 conf printout:
--- rd:3 wd:2 fd:1
disk 0, o:1, dev:sdd1
disk 1, o:1, dev:sdb1
>From some archive reading I understand that I can recreate the array using
mdadm --create /dev/md1 -l5 -n3 /dev/sdd1 /dev/sdb1 missing
but that I need to specify the correct order for the drives.
I've not used --assume-clean, --force or --run; should I? I assume that
since it's only got 2 of 3 then it won't need the assume-clean.
The detail and dmesg data suggests that the order in the command above
is correct.
Can anyone confirm this?
Thanks
David
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