출처 : http://blog.naver.com/want813/90035756222
본인은 현재
/dev/md5 에 /dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sdd1 을 사용중이며,
/dev/md5 를 /md5data 에 mount 해서 사용중이다.
/dev/sdc1 을 삭제해서 복구 테스트를 할 예정이다.
1. fail, remove disk
# umount /md5data ( 이 과정이 필요한지 아닌지.. 테스트 해보지 않았다 -_-;;)
# mdadm --manage /dev/md5 --fail /dev/sdc1 ( /dev/sdc1 을 faile 시킨다 )
# mdadm --detail /dev/md5
/dev/md5:
Version : 00.90.03
Creation Time : Thu Oct 2 20:58:52 2008
Raid Level : raid5
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Mon Oct 6 11:23:04 2008
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 0a75c94d:90e12dc2:17caabb6:a4c6ef14
Events : 0.190
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
3 8 49 3 active sync /dev/sdd1
4 8 33 - faulty spare /dev/sdc1
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md5 : active raid5 sdc1[4](F) sda1[0] sdd1[3] sdb1[1]
1465151808 blocks level 5, 64k chunk, algorithm 2 [4/3] [UU_U]
unused devices: <none>
# mdadm --manage /dev/md5 --remove /dev/sdc1
mdadm: hot removed /dev/sdc1
# mdadm --detail /dev/md5
/dev/md5:
Version : 00.90.03
Creation Time : Thu Oct 2 20:58:52 2008
Raid Level : raid5
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Mon Oct 6 11:27:08 2008
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 0a75c94d:90e12dc2:17caabb6:a4c6ef14
Events : 0.192
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 0 0 2 removed
3 8 49 3 active sync /dev/sdd1
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md5 : active raid5 sda1[0] sdd1[3] sdb1[1]
1465151808 blocks level 5, 64k chunk, algorithm 2 [4/3] [UU_U]
unused devices: <none>
# mount /dev/md5 /md5data
( application 이 잘 작동 되는지 확인 )
# reboot
................................................................................................................
# mdadm --manage /dev/md5 --add /dev/sdc1
mdadm: re-added /dev/sdc1
# mdadm --detail /dev/md5
/dev/md5:
Version : 00.90.03
Creation Time : Thu Oct 2 20:58:52 2008
Raid Level : raid5
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Mon Oct 6 11:33:35 2008
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 0% complete
UUID : 0a75c94d:90e12dc2:17caabb6:a4c6ef14
Events : 0.204
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
4 8 33 2 spare rebuilding /dev/sdc1
3 8 49 3 active sync /dev/sdd1
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md5 : active raid5 sdc1[4] sda1[0] sdd1[3] sdb1[1]
1465151808 blocks level 5, 64k chunk, algorithm 2 [4/3] [UU_U]
[>....................] recovery = 0.3% (1895068/488383936) finish=174.5min speed=46460K/sec
unused devices: <none>
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