I have 2 sata 300 gb hard drives mirrored - all partitions are mirrored.
this weekend the home (md6) partition lost one of its members (sda8) but sda did not fail only one partition.
So I assume i need to hot add back in sda8 to md6
and from the mdadm man page i got
# /sbin/mdadm /dev/md6 -a /dev/sda8
mdadm: Cannot open /dev/sda8: Device or resource busy
am I doing something wrong??? This is the first time i have used mdadm to manage raid.
do i have to unmount md6??
-chris
extra info below
# /sbin/mdadm -D /dev/md6
/dev/md6:
Version : 00.90.01
Creation Time : Sat Aug 27 21:16:47 2005
Raid Level : raid1
Array Size : 228420096 (217.84 GiB 233.90 GB)
Device Size : 228420096 (217.84 GiB 233.90 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 6
Persistence : Superblock is persistent
Update Time : Mon Jan 23 16:10:35 2006
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
UUID : dd8c6a34:5c54af22:1c287ca5:c8cf4219
Events : 0.3277181
Number Major Minor RaidDevice State
0 0 0 - removed
1 8 24 1 active sync /dev/sdb8
2 8 8 - faulty /dev/sda8
--------------------------------------
messages log
Jan 22 13:17:21 agwebinc kernel: ata1: command 0x25 timeout, stat 0x51 host_stat 0x21
Jan 22 13:17:21 agwebinc kernel: ata1: status=0x51 { DriveReady SeekComplete Error }
Jan 22 13:17:21 agwebinc kernel: ata1: error=0x04 { DriveStatusError }
Jan 22 13:17:21 agwebinc kernel: SCSI error : <0 0 0 0> return code = 0x8000002
Jan 22 13:17:21 agwebinc kernel: sda: Current: sense key: Aborted Command
Jan 22 13:17:21 agwebinc kernel: Additional sense: No additional sense information
Jan 22 13:17:21 agwebinc kernel: end_request: I/O error, dev sda, sector 159199891
Jan 22 13:17:21 agwebinc kernel: raid1: Disk failure on sda8, disabling device.
Jan 22 13:17:21 agwebinc kernel: Operation continuing on 1 devices
Jan 22 13:17:21 agwebinc kernel: raid1: sda8: rescheduling sector 29972968
Jan 22 13:17:21 agwebinc kernel: raid1: sdb8: redirecting sector 29972968 to another mirror
Jan 22 13:17:21 agwebinc kernel: RAID1 conf printout:
Jan 22 13:17:21 agwebinc kernel: --- wd:1 rd:2
Jan 22 13:17:21 agwebinc kernel: disk 0, wo:1, o:0, dev:sda8
Jan 22 13:17:21 agwebinc kernel: disk 1, wo:0, o:1, dev:sdb8
Jan 22 13:17:21 agwebinc kernel: RAID1 conf printout:
Jan 22 13:17:21 agwebinc kernel: --- wd:1 rd:2
Jan 22 13:17:21 agwebinc kernel: disk 1, wo:0, o:1, dev:sdb8
---------------------------------------
mdstat
[root@agwebinc usbdisk]# cat /proc/mdstat
Personalities : [raid1]
md5 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md1 : active raid1 sdb3[1] sda3[0]
15358016 blocks [2/2] [UU]
md2 : active raid1 sdb5[1] sda5[0]
15358016 blocks [2/2] [UU]
md3 : active raid1 sdb6[1] sda6[0]
8193024 blocks [2/2] [UU]
md4 : active raid1 sdb7[1] sda7[0]
5116544 blocks [2/2] [UU]
md6 : active raid1 sdb8[1] sda8[2](F)
228420096 blocks [2/1] [_U]
md0 : active raid1 sdb2[1] sda2[0]
20482752 blocks [2/2] [UU]
unused devices: <none>
-------------------------------------------------------
# /sbin/mdadm --examine /dev/sda8
/dev/sda8:
Magic : a92b4efc
Version : 00.90.01
UUID : dd8c6a34:5c54af22:1c287ca5:c8cf4219
Creation Time : Sat Aug 27 21:16:47 2005
Raid Level : raid1
Raid Devices : 2
Total Devices : 2
Preferred Minor : 6
Update Time : Sun Jan 22 13:16:52 2006
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 5cb7ffc9 - correct
Events : 0.3226885
Number Major Minor RaidDevice State
this 0 8 8 0 active sync /dev/sda8
0 0 8 8 0 active sync /dev/sda8
1 1 8 24 1 active sync /dev/sdb8
-------------------------------------------------------
# /sbin/mdadm --examine /dev/sdb8
/dev/sdb8:
Magic : a92b4efc
Version : 00.90.01
UUID : dd8c6a34:5c54af22:1c287ca5:c8cf4219
Creation Time : Sat Aug 27 21:16:47 2005
Raid Level : raid1
Raid Devices : 2
Total Devices : 2
Preferred Minor : 6
Update Time : Mon Jan 23 16:27:14 2006
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Checksum : 5cec4a0d - correct
Events : 0.3277961
Number Major Minor RaidDevice State
this 1 8 24 1 active sync /dev/sdb8
0 0 0 0 0 removed
1 1 8 24 1 active sync /dev/sdb8
