Hi, I have some problems with my raid. I tried updating from 5 disks raid5 to 8 disks raid6 as described on http://neil.brown.name/blog/20090817000931#2. The command I used was: mdadm --grow /dev/md0 --level=6 --raid-disk=8 While the rebuild was in progress my system hung, so I had to force power down it. After rebooting the system I reassembled the raid. You can see the resulting mess below. How can I recover from this state? root@mars ~ # mdadm -Af /dev/md0 mdadm: failed to RUN_ARRAY /dev/md0: Input/output error root@mars ~ # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : inactive sdk1[0] sdh1[8](S) sdg1[7](S) sdf1[6](S) sdi1[4] sdj1[3] sdl1[2] sde1[1] 11721087488 blocks md1 : active raid5 sdb1[0] sdd1[2] sdc1[1] 1953519872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] unused devices: <none> root@mars ~ # mdadm -D /dev/md0 /dev/md0: Version : 0.90 Creation Time : Fri Apr 9 19:24:51 2010 Raid Level : raid6 Used Dev Size : 1465135936 (1397.26 GiB 1500.30 GB) Raid Devices : 6 Total Devices : 8 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Jul 7 00:21:00 2010 State : active, degraded, Not Started Active Devices : 5 Working Devices : 8 Failed Devices : 0 Spare Devices : 3 Layout : left-symmetric-6 Chunk Size : 64K UUID : a1eb26ff:0d33b804:1c7aa044:e01dc78c (local to host mars) Events : 0.991518 Number Major Minor RaidDevice State 0 8 161 0 active sync /dev/sdk1 1 8 65 1 active sync /dev/sde1 2 8 177 2 active sync /dev/sdl1 3 8 145 3 active sync /dev/sdj1 4 8 129 4 active sync /dev/sdi1 5 0 0 5 removed 6 8 81 - spare /dev/sdf1 7 8 97 - spare /dev/sdg1 8 8 113 - spare /dev/sdh1 root@mars ~ # dmesg | tail -n 30 [ 7896.306100] md: bind<sde1> [ 7896.306240] md: bind<sdl1> [ 7896.306368] md: bind<sdj1> [ 7896.306495] md: bind<sdi1> [ 7896.306666] md: bind<sdf1> [ 7896.306795] md: bind<sdg1> [ 7896.306921] md: bind<sdh1> [ 7896.307048] md: bind<sdk1> [ 7896.308745] raid5: md0 is not clean -- starting background reconstruction [ 7896.308763] raid5: device sdk1 operational as raid disk 0 [ 7896.308765] raid5: device sdi1 operational as raid disk 4 [ 7896.308768] raid5: device sdj1 operational as raid disk 3 [ 7896.308770] raid5: device sdl1 operational as raid disk 2 [ 7896.308772] raid5: device sde1 operational as raid disk 1 [ 7896.309420] raid5: allocated 6386kB for md0 [ 7896.309465] 0: w=1 pa=0 pr=6 m=2 a=18 r=6 op1=0 op2=0 [ 7896.309468] 4: w=2 pa=0 pr=6 m=2 a=18 r=6 op1=0 op2=0 [ 7896.309471] 3: w=3 pa=0 pr=6 m=2 a=18 r=6 op1=0 op2=0 [ 7896.309473] 2: w=4 pa=0 pr=6 m=2 a=18 r=6 op1=0 op2=0 [ 7896.309476] 1: w=5 pa=0 pr=6 m=2 a=18 r=6 op1=0 op2=0 [ 7896.309478] raid5: cannot start dirty degraded array for md0 [ 7896.309503] RAID5 conf printout: [ 7896.309504] --- rd:6 wd:5 [ 7896.309506] disk 0, o:1, dev:sdk1 [ 7896.309508] disk 1, o:1, dev:sde1 [ 7896.309510] disk 2, o:1, dev:sdl1 [ 7896.309512] disk 3, o:1, dev:sdj1 [ 7896.309514] disk 4, o:1, dev:sdi1 [ 7896.309956] raid5: failed to run raid set md0 [ 7896.309970] md: pers->run() failed ... root@mars ~ # uname -a Linux mars 2.6.34-1-amd64 #1 SMP Sun Jun 6 22:29:25 UTC 2010 x86_64 GNU/Linux root@mars ~ # mdadm --version mdadm - v3.1.2 - 10th March 2010 -- Sebastian
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