Hi,
I was attempting to reshape a RAID5 from 4 to 5 devices. During the
reshape, I had a problem with one of the controller cards in the
machine, so that first one drive, had repeated errors (and was
eventually marked as failed), and then several hours later, I/O to
another drive effectively stalled. At this point, /proc/mdstat was
showing the reshape proceeding (with one drive marked as failed), but
the throughput had dropped to zero.
After rebooting the machine (alt-sysrq s, u, b) the array won't
reassemble (with or without '--force')...
(I've now replaced the card, and read all data on all drives
successfully...)
[ 2716.070788] raid5: md1 is not clean -- starting background reconstruction
[ 2716.070984] raid5: reshape will continue
[ 2716.071166] raid5: device sda1 operational as raid disk 0
[ 2716.071350] raid5: device sdi1 operational as raid disk 4
[ 2716.071534] raid5: device sdj1 operational as raid disk 3
[ 2716.071715] raid5: device sdk1 operational as raid disk 1
[ 2716.072217] raid5: allocated 5334kB for md1
[ 2716.072452] 0: w=1 pa=2 pr=4 m=1 a=2 r=5 op1=0 op2=0
[ 2716.072633] 4: w=2 pa=2 pr=4 m=1 a=2 r=5 op1=0 op2=0
[ 2716.072816] 3: w=3 pa=2 pr=4 m=1 a=2 r=5 op1=0 op2=0
[ 2716.073001] 1: w=4 pa=2 pr=4 m=1 a=2 r=5 op1=0 op2=0
[ 2716.073180] raid5: cannot start dirty degraded array for md1
[ 2716.073372] RAID5 conf printout:
[ 2716.073544] --- rd:5 wd:4
[ 2716.073717] disk 0, o:1, dev:sda1
[ 2716.073884] disk 1, o:1, dev:sdk1
[ 2716.074071] disk 3, o:1, dev:sdj1
[ 2716.074239] disk 4, o:1, dev:sdi1
[ 2716.074575] raid5: failed to run raid set md1
[ 2716.074749] md: pers->run() failed ...
Any chance of carrying on where it left off, or should I recreate the
array from scratch?
# cat /etc/debian_version ; uname -a
6.0.2
Linux rodmell 2.6.32-5-amd64 #1 SMP Tue Jun 14 09:42:28 UTC 2011 x86_64
GNU/Linux
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md1 : inactive sda1[0] sdi1[5] sdj1[4] sdk1[1]
7814054112 blocks super 1.2
# mdadm -E /dev/sd[hijak]1
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 717d7de6:49a886f6:fb20ac87:5a1e8a84
Name : rodmell:1 (local to host rodmell)
Creation Time : Mon Dec 19 18:00:13 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3907027056 (1863.02 GiB 2000.40 GB)
Array Size : 15628103680 (7452.06 GiB 8001.59 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 1bf82ae0:82b71e9b:6283dc62:467026fc
Reshape pos'n : 1622353920 (1547.20 GiB 1661.29 GB)
Delta Devices : 1 (4->5)
Update Time : Mon Aug 20 08:42:56 2012
Checksum : 46d057ad - correct
Events : 24587
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AA.AA ('A' == active, '.' == missing)
/dev/sdh1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 717d7de6:49a886f6:fb20ac87:5a1e8a84
Name : rodmell:1 (local to host rodmell)
Creation Time : Mon Dec 19 18:00:13 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3907027056 (1863.02 GiB 2000.40 GB)
Array Size : 15628103680 (7452.06 GiB 8001.59 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 3e9cca4d:3872738b:1903ee56:5a91b935
Reshape pos'n : 10582016 (10.09 GiB 10.84 GB)
Delta Devices : 1 (4->5)
Update Time : Thu Aug 16 17:30:46 2012
Checksum : 12400b18 - correct
Events : 15896
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAAA ('A' == active, '.' == missing)
/dev/sdi1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 717d7de6:49a886f6:fb20ac87:5a1e8a84
Name : rodmell:1 (local to host rodmell)
Creation Time : Mon Dec 19 18:00:13 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3907027056 (1863.02 GiB 2000.40 GB)
Array Size : 15628103680 (7452.06 GiB 8001.59 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 904de121:58fbef1d:16546bd7:d3ab29c5
Reshape pos'n : 1622353920 (1547.20 GiB 1661.29 GB)
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 01:32:23 2012
Checksum : 48e5a3d3 - correct
Events : 24586
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : AA.AA ('A' == active, '.' == missing)
/dev/sdj1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 717d7de6:49a886f6:fb20ac87:5a1e8a84
Name : rodmell:1 (local to host rodmell)
Creation Time : Mon Dec 19 18:00:13 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3907027056 (1863.02 GiB 2000.40 GB)
Array Size : 15628103680 (7452.06 GiB 8001.59 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 59efcddf:9e679807:09ce1bc4:d882af69
Reshape pos'n : 1622353920 (1547.20 GiB 1661.29 GB)
Delta Devices : 1 (4->5)
Update Time : Mon Aug 20 08:42:56 2012
Checksum : 81b55c43 - correct
Events : 24587
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AA.AA ('A' == active, '.' == missing)
/dev/sdk1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 717d7de6:49a886f6:fb20ac87:5a1e8a84
Name : rodmell:1 (local to host rodmell)
Creation Time : Mon Dec 19 18:00:13 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3907027056 (1863.02 GiB 2000.40 GB)
Array Size : 15628103680 (7452.06 GiB 8001.59 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 31b29cdb:0b70201e:de2036a4:5aecda02
Reshape pos'n : 1622353920 (1547.20 GiB 1661.29 GB)
Delta Devices : 1 (4->5)
Update Time : Mon Aug 20 08:42:56 2012
Checksum : d51e3dc - correct
Events : 24587
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AA.AA ('A' == active, '.' == missing)
Cheers,
Tim.
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