Hello all,
During a reshape of a RAID6, one of the disks in the array crashed hard.
Normally, I would simply remove the drive from the array, replace the
drive, and rebuild. However, when I try to remove the drive, I get an
error:
# mdadm /dev/md127 --remove /dev/sdg
mdadm: hot remove failed for /dev/sdg: Device or resource busy
I have done a fair amount of googling, but nothing seems to turn up
advice on how to handle this situation. Any suggestions?
Some relevant outputs are below. If other output is desired (mdadm -E)
please let me know. sdg is the failed device, and sdm is a spare which
I would like to use to restart the rebuild/reshape. The array itself
seems perfectly fine at the moment--I can mount it, umount it, and read
and write files with no problem. (I currently have it umounted.)
# uname -a
Linux XXXXXXX 2.6.32-279.22.1.el6.x86_64 #1 SMP Wed Feb 6 03:10:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
# mdadm --version
mdadm - v3.2.3 - 23rd December 2011
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md127 : active raid6 sdm[13](S) sdg[5](F) sdj[8] sdi[7] sdk[10] sdc[1] sdn[12] sdd[2] sde[3] sdf[4] sdh[6] sdb[0] sdl[11]
17578013184 blocks super 1.2 level 6, 512k chunk, algorithm 2 [12/11] [UUUUU_UUUUUU]
resync=PENDING
unused devices: <none>
# mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Thu Feb 9 15:10:28 2012
Raid Level : raid6
Array Size : 17578013184 (16763.70 GiB 17999.89 GB)
Used Dev Size : 1953112576 (1862.63 GiB 1999.99 GB)
Raid Devices : 12
Total Devices : 13
Persistence : Superblock is persistent
Update Time : Thu Feb 7 14:37:04 2013
State : active, degraded, resyncing (PENDING)
Active Devices : 11
Working Devices : 12
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Delta Devices : 1, (11->12)
Name : XXXXXX:0
UUID : f660639e:5b7583ae:4c69519f:ea7c8c31
Events : 66091
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
2 8 48 2 active sync /dev/sdd
3 8 64 3 active sync /dev/sde
4 8 80 4 active sync /dev/sdf
5 8 96 5 faulty spare rebuilding /dev/sdg
6 8 112 6 active sync /dev/sdh
7 8 128 7 active sync /dev/sdi
8 8 144 8 active sync /dev/sdj
10 8 160 9 active sync /dev/sdk
11 8 176 10 active sync /dev/sdl
12 8 208 11 active sync /dev/sdn
13 8 192 - spare /dev/sdm
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