Linux Software RAID: Difference between revisions
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===The problem: Two failed disks in a RAID5=== | ===The problem: Two failed disks in a RAID5=== | ||
Looks ugly but maybe we have luck and the disks are just marked as bad. | Looks ugly but maybe we have luck and the disks are just marked as bad. | ||
==== cat /proc/mdstat ==== | |||
<source lang=bash> | |||
# cat /proc/mdstat | |||
Personalities : [raid1] [raid6] [raid5] [raid4] | |||
... | |||
md10 : inactive sdap1[11] sdao1[5] sdah1[15](S) sdag1[4] sdy1[3] sdz1[14] sdr1[8] sdb1[13] sdq1[16](S) sdi1[1] sda1[12] | |||
5236577280 blocks super 1.2 | |||
... | |||
</source> | |||
State is <i>inactive</i> this is not what we want... look for the details in the next step | |||
==== mdadm --detail ==== | |||
<source lang=bash> | <source lang=bash> | ||
# mdadm --detail /dev/md10 | # mdadm --detail /dev/md10 | ||
Revision as of 11:09, 16 June 2016
mdadm
Force rebuild of a failed RAID
Example for /dev/md10
The problem: Two failed disks in a RAID5
Looks ugly but maybe we have luck and the disks are just marked as bad.
cat /proc/mdstat
# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
...
md10 : inactive sdap1[11] sdao1[5] sdah1[15](S) sdag1[4] sdy1[3] sdz1[14] sdr1[8] sdb1[13] sdq1[16](S) sdi1[1] sda1[12]
5236577280 blocks super 1.2
...
State is inactive this is not what we want... look for the details in the next step
mdadm --detail
# mdadm --detail /dev/md10
/dev/md10:
Version : 1.2
Creation Time : Wed Feb 6 13:44:52 2013
Raid Level : raid5
Used Dev Size : 476052288 (454.00 GiB 487.48 GB)
Raid Devices : 11
Total Devices : 11
Persistence : Superblock is persistent
Update Time : Wed Jun 15 17:46:57 2016
State : active, FAILED, Not Started
Active Devices : 9
Working Devices : 11
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 64K
Name : md10
UUID : 82f2b88d:276a1fd3:55a4928e:b2228edf
Events : 17071
Number Major Minor RaidDevice State
11 66 145 0 active sync /dev/sdap1
1 8 129 1 active sync /dev/sdi1
2 0 0 2 removed
3 65 129 3 active sync /dev/sdy1
4 66 1 4 active sync /dev/sdag1
5 66 129 5 active sync /dev/sdao1
12 8 1 6 active sync /dev/sda1
7 0 0 7 removed
8 65 17 8 active sync /dev/sdr1
13 8 17 9 active sync /dev/sdb1
14 65 145 10 active sync /dev/sdz1
15 66 17 - spare /dev/sdah1
16 65 1 - spare /dev/sdq1
Force the rescan and reassemble the RAID
For a SCSI-rescan you can try this: Scan all SCSI buses for new devices
And you have to do this:
# mdadm --scan /dev/md10
# mdadm --assemble --force --scan
# mdadm --run /dev/md10
Check the status
# mdadm --detail /dev/md10
/dev/md10:
Version : 1.2
Creation Time : Wed Feb 6 13:44:52 2013
Raid Level : raid5
Array Size : 4760522880 (4539.99 GiB 4874.78 GB)
Used Dev Size : 476052288 (454.00 GiB 487.48 GB)
Raid Devices : 11
Total Devices : 12
Persistence : Superblock is persistent
Update Time : Thu Jun 16 10:59:16 2016
State : clean, degraded, recovering
Active Devices : 10
Working Devices : 12
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 5% complete
Name : md10
UUID : 82f2b88d:276a1fd3:55a4928e:b2228edf
Events : 17074
Number Major Minor RaidDevice State
11 66 145 0 active sync /dev/sdap1
1 8 129 1 active sync /dev/sdi1
16 65 1 2 spare rebuilding /dev/sdq1
3 65 129 3 active sync /dev/sdy1
4 66 1 4 active sync /dev/sdag1
5 66 129 5 active sync /dev/sdao1
12 8 1 6 active sync /dev/sda1
7 8 145 7 active sync /dev/sdj1
8 65 17 8 active sync /dev/sdr1
13 8 17 9 active sync /dev/sdb1
14 65 145 10 active sync /dev/sdz1
15 66 17 - spare /dev/sdah1
This is good:
State : clean, degraded, recovering
Better wait with the next reboot for completion:
Rebuild Status : 5% complete
It should continue rebuilding if you boot but... know the devils...
