Thank you for answering my mail. But to actually read it instead of
posting a link which contains no more information as already in the
RAID FAQ or mdadm man page, here is the short version of my problem:
disc 0: sdi1 <- is now disc 7 and SPARE
disc 1: sdl1
disc 2: sdh1
disc 3: sdj1
disc 4: sdk1
disc 5: sdg1
disc 6: sda1 <- is now faulty removed
sdb1 <- not finished replacement drive, now SPARE
of the original 7 drives, 2 are disabled. Please tell me how to
- re-add sdi1 as disc 0 (mdadm --re-add just adds it as spare)
- how to enable sda1 as disc6 (mdadm --assemble --force --scan refuses
to acceppt it)
- how to use the new drive sdb1 as disc7 (mdadm --assemble --force --
scan just adds it as spare)
original post:
After removing a drive and restoring to the new one, another disc in
the array failed. Now I still have all the data redundantly available
(the old drive is still there), but the RAID header is now in a state
where it's impossible to access the data. Is it possible to rearrange
the drives to force the kernel to a valid array?
Here is the story:
// my normal boot log showing RAID devices
Jun 1 22:37:45 localhost klogd: md: md0 stopped.
Jun 1 22:37:45 localhost klogd: md: bind<sdl1>
Jun 1 22:37:45 localhost klogd: md: bind<sdh1>
Jun 1 22:37:45 localhost klogd: md: bind<sdj1>
Jun 1 22:37:45 localhost klogd: md: bind<sdk1>
Jun 1 22:37:45 localhost klogd: md: bind<sdg1>
Jun 1 22:37:45 localhost klogd: md: bind<sda1>
Jun 1 22:37:45 localhost klogd: md: bind<sdi1>
Jun 1 22:37:45 localhost klogd: xor: automatically using best
checksumming function: generic_sse
Jun 1 22:37:45 localhost klogd: generic_sse: 5144.000 MB/sec
Jun 1 22:37:45 localhost klogd: xor: using function: generic_sse
(5144.000 MB/sec)
Jun 1 22:37:45 localhost klogd: async_tx: api initialized (async)
Jun 1 22:37:45 localhost klogd: raid6: int64x1 1539 MB/s
Jun 1 22:37:45 localhost klogd: raid6: int64x2 1558 MB/s
Jun 1 22:37:45 localhost klogd: raid6: int64x4 1968 MB/s
Jun 1 22:37:45 localhost klogd: raid6: int64x8 1554 MB/s
Jun 1 22:37:45 localhost klogd: raid6: sse2x1 2441 MB/s
Jun 1 22:37:45 localhost klogd: raid6: sse2x2 3250 MB/s
Jun 1 22:37:45 localhost klogd: raid6: sse2x4 3460 MB/s
Jun 1 22:37:45 localhost klogd: raid6: using algorithm sse2x4 (3460
MB/s)
Jun 1 22:37:45 localhost klogd: md: raid6 personality registered for
level 6
Jun 1 22:37:45 localhost klogd: md: raid5 personality registered for
level 5
Jun 1 22:37:45 localhost klogd: md: raid4 personality registered for
level 4
Jun 1 22:37:45 localhost klogd: raid5: device sdi1 operational as
raid disk 0
Jun 1 22:37:45 localhost klogd: raid5: device sda1 operational as
raid disk 6
Jun 1 22:37:45 localhost klogd: raid5: device sdg1 operational as
raid disk 5
Jun 1 22:37:45 localhost klogd: raid5: device sdk1 operational as
raid disk 4
Jun 1 22:37:45 localhost klogd: raid5: device sdj1 operational as
raid disk 3
Jun 1 22:37:45 localhost klogd: raid5: device sdh1 operational as
raid disk 2
Jun 1 22:37:45 localhost klogd: raid5: device sdl1 operational as
raid disk 1
Jun 1 22:37:45 localhost klogd: raid5: allocated 7434kB for md0
Jun 1 22:37:45 localhost klogd: raid5: raid level 5 set md0 active
with 7 out of 7 devices, algorithm 2
Jun 1 22:37:45 localhost klogd: RAID5 conf printout:
Jun 1 22:37:45 localhost klogd: --- rd:7 wd:7
Jun 1 22:37:45 localhost klogd: disk 0, o:1, dev:sdi1
Jun 1 22:37:45 localhost klogd: disk 1, o:1, dev:sdl1
Jun 1 22:37:45 localhost klogd: disk 2, o:1, dev:sdh1
Jun 1 22:37:45 localhost klogd: disk 3, o:1, dev:sdj1
Jun 1 22:37:45 localhost klogd: disk 4, o:1, dev:sdk1
Jun 1 22:37:45 localhost klogd: disk 5, o:1, dev:sdg1
Jun 1 22:37:45 localhost klogd: disk 6, o:1, dev:sda1
Jun 1 22:37:45 localhost klogd: md0: detected capacity change from 0
to 6001213046784
Jun 1 22:37:45 localhost klogd: md0: unknown partition table
// now a new spare drive is added
[root@localhost ~]# mdadm /dev/md0 --add /dev/sdb1
Jun 1 22:42:00 localhost klogd: md: bind<sdb1>
// and here goes the drive replacement
[root@localhost ~]# mdadm /dev/md0 --fail /dev/sdi1 --remove /dev/sdi1
Jun 1 22:44:10 localhost klogd: raid5: Disk failure on sdi1,
disabling device.
Jun 1 22:44:10 localhost klogd: raid5: Operation continuing on 6
devices.
Jun 1 22:44:10 localhost klogd: RAID5 conf printout:
Jun 1 22:44:10 localhost klogd: --- rd:7 wd:6
Jun 1 22:44:10 localhost klogd: disk 0, o:0, dev:sdi1
Jun 1 22:44:10 localhost klogd: disk 1, o:1, dev:sdl1
Jun 1 22:44:10 localhost klogd: disk 2, o:1, dev:sdh1
Jun 1 22:44:10 localhost klogd: disk 3, o:1, dev:sdj1
Jun 1 22:44:10 localhost klogd: disk 4, o:1, dev:sdk1
Jun 1 22:44:10 localhost klogd: disk 5, o:1, dev:sdg1
Jun 1 22:44:10 localhost klogd: disk 6, o:1, dev:sda1
Jun 1 22:44:10 localhost klogd: RAID5 conf printout:
Jun 1 22:44:10 localhost klogd: --- rd:7 wd:6
Jun 1 22:44:10 localhost klogd: disk 1, o:1, dev:sdl1
Jun 1 22:44:10 localhost klogd: disk 2, o:1, dev:sdh1
Jun 1 22:44:10 localhost klogd: disk 3, o:1, dev:sdj1
Jun 1 22:44:10 localhost klogd: disk 4, o:1, dev:sdk1
Jun 1 22:44:10 localhost klogd: disk 5, o:1, dev:sdg1
Jun 1 22:44:10 localhost klogd: disk 6, o:1, dev:sda1
Jun 1 22:44:10 localhost klogd: RAID5 conf printout:
Jun 1 22:44:10 localhost klogd: --- rd:7 wd:6
Jun 1 22:44:10 localhost klogd: disk 0, o:1, dev:sdb1
Jun 1 22:44:10 localhost klogd: disk 1, o:1, dev:sdl1
Jun 1 22:44:10 localhost klogd: disk 2, o:1, dev:sdh1
Jun 1 22:44:10 localhost klogd: disk 3, o:1, dev:sdj1
Jun 1 22:44:10 localhost klogd: disk 4, o:1, dev:sdk1
Jun 1 22:44:10 localhost klogd: disk 5, o:1, dev:sdg1
Jun 1 22:44:10 localhost klogd: disk 6, o:1, dev:sda1
Jun 1 22:44:10 localhost klogd: md: recovery of RAID array md0
Jun 1 22:44:10 localhost klogd: md: unbind<sdi1>
Jun 1 22:44:10 localhost klogd: md: minimum _guaranteed_ speed: 1000
KB/sec/disk.
Jun 1 22:44:10 localhost klogd: md: using maximum available idle IO
bandwidth (but not more than 200000 KB/sec) for recovery.
Jun 1 22:44:10 localhost klogd: md: using 128k window, over a total
of 976759936 blocks.
Jun 1 22:44:10 localhost klogd: md: export_rdev(sdi1)
[root@localhost ~]# more /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb1[7] sda1[6] sdg1[5] sdk1[4] sdj1[3] sdh1[2]
sdl1[1]
5860559616 blocks level 5, 64k chunk, algorithm 2 [7/6] [_UUUUUU]
[=====>...............] recovery = 27.5% (269352320/976759936)
finish=276.2min speed=42686K/sec
// surface error on RAID drive while recovery:
Jun 2 03:58:59 localhost klogd: ata1.00: exception Emask 0x0 SAct
0xffff SErr 0x0 action 0x0
Jun 2 03:59:49 localhost klogd: ata1.00: irq_stat 0x40000008
Jun 2 03:59:49 localhost klogd: ata1.00: cmd
60/08:58:3f:bd:b8/00:00:6b:00:00/40 tag 11 ncq 4096 in
Jun 2 03:59:49 localhost klogd: res 41/40:08:3f:bd:b8/8c:
00:6b:00:00/00 Emask 0x409 (media error) <F>
Jun 2 03:59:49 localhost klogd: ata1.00: status: { DRDY ERR }
Jun 2 03:59:49 localhost klogd: ata1.00: error: { UNC }
Jun 2 03:59:49 localhost klogd: ata1.00: configured for UDMA/133
Jun 2 03:59:49 localhost klogd: ata1: EH complete
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] 2930277168 512-byte
hardware sectors: (1.50 TB/1.36 TiB)
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write Protect is off
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Jun 2 03:59:49 localhost klogd: ata1.00: exception Emask 0x0 SAct
0x3ffc SErr 0x0 action 0x0
Jun 2 03:59:49 localhost klogd: ata1.00: irq_stat 0x40000008
Jun 2 03:59:49 localhost klogd: ata1.00: cmd
60/08:20:3f:bd:b8/00:00:6b:00:00/40 tag 4 ncq 4096 in
Jun 2 03:59:49 localhost klogd: res
41/40:08:3f:bd:b8/28:00:6b:00:00/00 Emask 0x409 (media error) <F>
Jun 2 03:59:49 localhost klogd: ata1.00: status: { DRDY ERR }
Jun 2 03:59:49 localhost klogd: ata1.00: error: { UNC }
Jun 2 03:59:49 localhost klogd: ata1.00: configured for UDMA/133
Jun 2 03:59:49 localhost klogd: ata1: EH complete
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] 2930277168 512-byte
hardware sectors: (1.50 TB/1.36 TiB)
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write Protect is off
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
...
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269136 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269144 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269152 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269160 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269168 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269176 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269184 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269192 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269200 on sda1).
Jun 2 03:59:49 localhost klogd: raid5:md0: read error not correctable
(sector 1807269208 on sda1).
Jun 2 03:59:49 localhost klogd: ata1: EH complete
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] 2930277168 512-byte
hardware sectors: (1.50 TB/1.36 TiB)
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write Protect is off
Jun 2 03:59:49 localhost klogd: sd 0:0:0:0: [sda] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Jun 2 03:59:49 localhost klogd: RAID5 conf printout:
Jun 2 03:59:49 localhost klogd: --- rd:7 wd:5
Jun 2 03:59:49 localhost klogd: disk 0, o:1, dev:sdb1
Jun 2 03:59:49 localhost klogd: disk 1, o:1, dev:sdl1
Jun 2 03:59:49 localhost klogd: disk 2, o:1, dev:sdh1
Jun 2 03:59:49 localhost klogd: disk 3, o:1, dev:sdj1
Jun 2 03:59:49 localhost klogd: disk 4, o:1, dev:sdk1
Jun 2 03:59:49 localhost klogd: disk 5, o:1, dev:sdg1
Jun 2 03:59:49 localhost klogd: disk 6, o:0, dev:sda1
Jun 2 03:59:49 localhost klogd: RAID5 conf printout:
Jun 2 03:59:49 localhost klogd: --- rd:7 wd:5
Jun 2 03:59:49 localhost klogd: disk 1, o:1, dev:sdl1
Jun 2 03:59:49 localhost klogd: disk 2, o:1, dev:sdh1
Jun 2 03:59:49 localhost klogd: disk 3, o:1, dev:sdj1
Jun 2 03:59:50 localhost klogd: disk 4, o:1, dev:sdk1
Jun 2 03:59:50 localhost klogd: disk 5, o:1, dev:sdg1
Jun 2 03:59:50 localhost klogd: disk 6, o:0, dev:sda1
Jun 2 03:59:50 localhost klogd: RAID5 conf printout:
Jun 2 03:59:50 localhost klogd: --- rd:7 wd:5
Jun 2 03:59:50 localhost klogd: disk 1, o:1, dev:sdl1
Jun 2 03:59:50 localhost klogd: disk 2, o:1, dev:sdh1
Jun 2 03:59:50 localhost klogd: disk 3, o:1, dev:sdj1
Jun 2 03:59:50 localhost klogd: disk 4, o:1, dev:sdk1
Jun 2 03:59:50 localhost klogd: disk 5, o:1, dev:sdg1
Jun 2 03:59:50 localhost klogd: disk 6, o:0, dev:sda1
Jun 2 03:59:50 localhost klogd: RAID5 conf printout:
Jun 2 03:59:50 localhost klogd: --- rd:7 wd:5
Jun 2 03:59:50 localhost klogd: disk 1, o:1, dev:sdl1
Jun 2 03:59:50 localhost klogd: disk 2, o:1, dev:sdh1
Jun 2 03:59:50 localhost klogd: disk 3, o:1, dev:sdj1
Jun 2 03:59:50 localhost klogd: disk 4, o:1, dev:sdk1
Jun 2 03:59:50 localhost klogd: disk 5, o:1, dev:sdg1
Jun 2 04:26:17 localhost smartd[2502]: Device: /dev/sda, 34 Currently
unreadable (pending) sectors
Jun 2 04:26:17 localhost smartd[2502]: Device: /dev/sda, 34 Offline
uncorrectable sectors
// md0 is now down. But hey, still got the old drive, so just add it
again:
[root@localhost ~]# mdadm /dev/md0 --add /dev/sdi1
Jun 2 09:11:49 localhost klogd: md: bind<sdi1>
// it's just added as a SPARE! HELP!!! reboot always helps..
[root@localhost ~]# reboot
[root@localhost log]# mdadm -E /dev/sd[bagkjhli]1
/dev/sda1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 7
Preferred Minor : 0
Update Time : Mon Jun 1 22:44:10 2009
State : clean
Active Devices : 6
Working Devices : 7
Failed Devices : 0
Spare Devices : 1
Checksum : 22d364f3 - correct
Events : 2599984
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 6 8 1 6 active sync /dev/sda1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 8 1 6 active sync /dev/sda1
7 7 8 17 7 spare /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f8dd - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 8 8 17 8 spare /dev/sdb1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdg1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f92d - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 5 8 97 5 active sync /dev/sdg1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdh1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f937 - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 113 2 active sync /dev/sdh1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdi1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f94b - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 7 8 129 7 spare /dev/sdi1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdj1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f959 - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 145 3 active sync /dev/sdj1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdk1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f96b - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 4 8 161 4 active sync /dev/sdk1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
/dev/sdl1:
Magic : a92b4efc
Version : 0.90.00
UUID : 15401f4b:391c2538:89022bfa:d48f439f
Creation Time : Sun Nov 2 13:21:54 2008
Raid Level : raid5
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Array Size : 5860559616 (5589.07 GiB 6001.21 GB)
Raid Devices : 7
Total Devices : 8
Preferred Minor : 0
Update Time : Tue Jun 2 09:11:49 2009
State : clean
Active Devices : 5
Working Devices : 7
Failed Devices : 1
Spare Devices : 2
Checksum : 22d3f975 - correct
Events : 2599992
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 177 1 active sync /dev/sdl1
0 0 0 0 0 removed
1 1 8 177 1 active sync /dev/sdl1
2 2 8 113 2 active sync /dev/sdh1
3 3 8 145 3 active sync /dev/sdj1
4 4 8 161 4 active sync /dev/sdk1
5 5 8 97 5 active sync /dev/sdg1
6 6 0 0 6 faulty removed
7 7 8 129 7 spare /dev/sdi1
8 8 8 17 8 spare /dev/sdb1
the old RAID configuration was:
disc 0: sdi1 <- is now disc 7 and SPARE
disc 1: sdl1
disc 2: sdh1
disc 3: sdj1
disc 4: sdk1
disc 5: sdg1
disc 6: sda1 <- is now faulty removed
[root@localhost log]# mdadm --assemble --force /dev/md0 /dev/
sd[ilhjkgab]1
mdadm: /dev/md/0 assembled from 5 drives and 2 spares - not enough to
start the array.
[root@localhost log]# cat /proc/mdstat
Personalities :
md0 : inactive sdl1[1](S) sdb1[8](S) sdi1[7](S) sda1[6](S) sdg1[5](S)
sdk1[4](S) sdj1[3](S) sdh1[2](S)
8790840960 blocks
On large arrays this may happen a lot: A bad drive is first discovered
during maintenance operations when it's too late. Maybe an option to
add a redundant drive in a fail-save way would be a good idea to add
to md sevices.
Please tell me if you see any solution to the problems below.
1. Is it possible to reassign /dev/sdi1 as disc 0 and access the RAID
as is was before the restore attempt?
2. Is it possible to reassign /dev/sda1 as disc 6 and backup the still
readable data on the RAID?
3. I guess more then 90% of data was written to /dev/sdb1 in the
restore attempt. Is it possble to use /dev/sdb1 as disc 7 to access
the RAID?
Thank you for looking at the problem
Alexander
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