Hi,
i think i have a similar problem like gilbo and anupindi007 in this tread
http://storageforum.net/forum/showthread.php?t=5890, but im not sure how it can help me.
the situation:
system is debian sqeeze wit 13x1,5tb sata disk and ext4. after i grow the sw-raid5 from 12 to 13 disk (from 15 to 18tb) i realized that ext4 tools can only grow up to 16tb. ;( after that i want to degrade the raid back to 12 disk. and now the raid is gone.
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdk[0] sda[13](S) sdg[12] sdf[11] sde[10] sdd[9] sdc[8] sdb[6] sdi[5] sdh[4] sdm[3] sdl[2]
17581661952 blocks
unused devices: <none>
mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Tue Oct 13 23:26:17 2009
Raid Level : raid5
Used Dev Size : 1465138496 (1397.26 GiB 1500.30 GB)
Raid Devices : 13
Total Devices : 12
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Jun 3 23:47:53 2011
State : active, FAILED, Not Started
Active Devices : 11
Working Devices : 12
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : 975d6eb2:285eed11:021df236:c2d05073
Events : 0.156864
Number Major Minor RaidDevice State
0 8 160 0 active sync /dev/sdk
1 0 0 1 removed
2 8 176 2 active sync /dev/sdl
3 8 192 3 active sync /dev/sdm
4 8 112 4 active sync /dev/sdh
5 8 128 5 active sync /dev/sdi
6 8 16 6 active sync /dev/sdb
7 0 0 7 removed
8 8 32 8 active sync /dev/sdc
9 8 48 9 active sync /dev/sdd
10 8 64 10 active sync /dev/sde
11 8 80 11 active sync /dev/sdf
12 8 96 12 active sync /dev/sdg
13 8 0 - spare /dev/sda
example of one disk:
mdadm --examine -v /dev/sdk
/dev/sdk:
Magic : a92b4efc
Version : 0.90.00
UUID : 975d6eb2:285eed11:021df236:c2d05073
Creation Time : Tue Oct 13 23:26:17 2009
Raid Level : raid5
Used Dev Size : 1465138496 (1397.26 GiB 1500.30 GB)
Array Size : 17581661952 (16767.18 GiB 18003.62 GB)
Raid Devices : 13
Total Devices : 12
Preferred Minor : 0
Update Time : Fri Jun 3 23:47:53 2011
State : clean
Active Devices : 11
Working Devices : 12
Failed Devices : 2
Spare Devices : 1
Checksum : 1dee41ea - correct
Events : 156864
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 112 0 active sync /dev/sdh
0 0 8 112 0 active sync /dev/sdh
1 1 0 0 1 faulty removed
2 2 8 128 2 active sync /dev/sdi
3 3 8 144 3 active sync /dev/sdj
4 4 8 176 4 active sync /dev/sdl
5 5 8 192 5 active sync /dev/sdm
6 6 8 16 6 active sync /dev/sdb
7 7 0 0 7 faulty removed
8 8 8 32 8 active sync /dev/sdc
9 9 8 48 9 active sync /dev/sdd
10 10 8 64 10 active sync /dev/sde
11 11 8 80 11 active sync /dev/sdf
12 12 8 96 12 active sync /dev/sdg
13 13 8 0 13 spare /dev/sda
i dont understand at this point that the details of sdk are show for sdh ?! is it because of the wrong uuid?
: Kommando nicht gefunden.
nassrv01:~# mdadm --assemble -v /dev/md0
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/sdi: Device or resource busy
mdadm: /dev/sdi has wrong uuid.
mdadm: cannot open device /dev/sdm: Device or resource busy
mdadm: /dev/sdm has wrong uuid.
mdadm: cannot open device /dev/sdl: Device or resource busy
mdadm: /dev/sdl has wrong uuid.
mdadm: cannot open device /dev/sdk: Device or resource busy
mdadm: /dev/sdk has wrong uuid.
mdadm: cannot open device /dev/sdj5: Device or resource busy
mdadm: /dev/sdj5 has wrong uuid.
mdadm: no RAID superblock on /dev/sdj2
mdadm: /dev/sdj2 has wrong uuid.
mdadm: cannot open device /dev/sdj1: Device or resource busy
mdadm: /dev/sdj1 has wrong uuid.
mdadm: cannot open device /dev/sdj: Device or resource busy
mdadm: /dev/sdj has wrong uuid.
mdadm: cannot open device /dev/sde: Device or resource busy
mdadm: /dev/sde has wrong uuid.
mdadm: cannot open device /dev/sdh: Device or resource busy
mdadm: /dev/sdh has wrong uuid.
mdadm: cannot open device /dev/sdg: Device or resource busy
mdadm: /dev/sdg has wrong uuid.
mdadm: cannot open device /dev/sdf: Device or resource busy
mdadm: /dev/sdf has wrong uuid.
mdadm: cannot open device /dev/sdd: Device or resource busy
mdadm: /dev/sdd has wrong uuid.
mdadm: cannot open device /dev/sdc: Device or resource busy
mdadm: /dev/sdc has wrong uuid.
mdadm: cannot open device /dev/sdb: Device or resource busy
mdadm: /dev/sdb has wrong uuid.
mdadm: cannot open device /dev/sda: Device or resource busy
mdadm: /dev/sda has wrong uuid.
mdadm: /dev/md0 is already in use.
mdadm --examine --scan
ARRAY /dev/md0 UUID=975d6eb2:285eed11:021df236:c2d05073
spares=2
need further info?
i need so much help, and sorry for my english.
