Hello
During a motherboard upgrade, I did something rather stupid : rewrite grub to
the bootsector of my bootdisk ( or so i thought ), but due to the new board
and thus a new device order I ended up destroying the beginning of 1 disk of
a 6 disk raid5 array. No worries, but after completly zeroing the "bad" disk,
i can't add it anymore.
mdadm says this :
/dev/md0:
Version : 00.90.03
Creation Time : Thu Aug 16 22:51:10 2007
Raid Level : raid5
Array Size : 1220992320 (1164.43 GiB 1250.30 GB)
Used Dev Size : 244198464 (232.89 GiB 250.06 GB)
Raid Devices : 6
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Aug 16 23:01:46 2007
State : clean, degraded
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-asymmetric
Chunk Size : 64K
UUID : 31bd67ad:59721ed7:2e0fde4f:67729963
Events : 0.28
Number Major Minor RaidDevice State
0 8 96 0 active sync /dev/sdg
1 8 32 1 active sync /dev/sdc
2 0 0 2 removed
3 8 48 3 active sync /dev/sdd
4 8 16 4 active sync /dev/sdb
5 8 80 5 active sync /dev/sdf
The new disk is definetly clean :
mdadm -E /dev/sde
mdadm: No md superblock detected on /dev/sde.
Seems a-ok, but when i do
mdadm -a /dev/md0 /dev/sde
mdadm: add new device failed for /dev/sde as 6: Invalid argument
I get an error, and the following in the kernel log
md: sde has invalid sb, not importing!
md: md_import_device returned -22
After this, running mdadm -E /dev/sde again shows the disk now has a
superblock, but it's still a mistery to me as to why the disk won't get
imported in the array:
/dev/sde:
Magic : a92b4efc
Version : 00.90.00
UUID : 31bd67ad:59721ed7:2e0fde4f:67729963
Creation Time : Thu Aug 16 22:51:10 2007
Raid Level : raid5
Used Dev Size : 244198464 (232.89 GiB 250.06 GB)
Array Size : 1220992320 (1164.43 GiB 1250.30 GB)
Raid Devices : 6
Total Devices : 5
Preferred Minor : 0
Update Time : Thu Aug 16 23:38:08 2007
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Checksum : 65f5f8c1 - correct
Events : 0.32
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 6 8 64 -1 spare /dev/sde
0 0 8 96 0 active sync /dev/sdg
1 1 8 32 1 active sync /dev/sdc
2 2 0 0 2 faulty removed
3 3 8 48 3 active sync /dev/sdd
4 4 8 16 4 active sync /dev/sdb
5 5 8 80 5 active sync /dev/sdf
No rebuilding happens after this, so i am left with a degraded array.
md0 : active raid5 sdf[5] sdb[4] sdd[3] sdc[1] sdg[0]
1220992320 blocks level 5, 64k chunk, algorithm 0 [6/5] [UU_UUU]
unused devices: <none>
Any ideas ?
Kind regards
den_RDC
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