I was trying to resize a Raid 5 array of 4 500G drives to 5. Kernel
version 2.6.23-rc3 was the kernel I STARTED on this.
I added the device to the array :
mdadm --add /dev/md0 /dev/sdb1
Then I started to grow the array :
mdadm --grow /dev/md0 --raid-devices=5
At this point the machine locked up. Not good.
I ended up having to hard reboot. Now, I have the following in dmesg :
md: md0: raid array is not clean -- starting background reconstruction
raid5: reshape_position too early for auto-recovery - aborting.
md: pers->run() failed ...
/proc/mdstat is :
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdf1[0] sdb1[4] sdc1[3] sdd1[2] sde1[1]
2441918720 blocks super 0.91
unused devices: <none>
It doesn't look like it actually DID anything besides update the raid
count to 5 from 4. (I think.)
How do I do a manual recovery on this?
Examining the disks:
mdadm -E /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 00.91.00
UUID : a9a472d3:9586c602:9207b56b:a5185bd3
Creation Time : Thu Dec 21 09:42:27 2006
Raid Level : raid5
Used Dev Size : 488383744 (465.76 GiB 500.10 GB)
Array Size : 1953534976 (1863.04 GiB 2000.42 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 19:49:43 2007
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : c8ebb87b - correct
Events : 0.2795
Layout : left-symmetric
Chunk Size : 256K
Number Major Minor RaidDevice State
this 4 8 17 4 active sync /dev/sdb1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 65 1 active sync /dev/sde1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 33 3 active sync /dev/sdc1
4 4 8 17 4 active sync /dev/sdb1
mdadm -E /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 00.91.00
UUID : a9a472d3:9586c602:9207b56b:a5185bd3
Creation Time : Thu Dec 21 09:42:27 2006
Raid Level : raid5
Used Dev Size : 488383744 (465.76 GiB 500.10 GB)
Array Size : 1953534976 (1863.04 GiB 2000.42 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 19:49:43 2007
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : c8ebb889 - correct
Events : 0.2795
Layout : left-symmetric
Chunk Size : 256K
Number Major Minor RaidDevice State
this 3 8 33 3 active sync /dev/sdc1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 65 1 active sync /dev/sde1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 33 3 active sync /dev/sdc1
4 4 8 17 4 active sync /dev/sdb1
mdadm -E /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 00.91.00
UUID : a9a472d3:9586c602:9207b56b:a5185bd3
Creation Time : Thu Dec 21 09:42:27 2006
Raid Level : raid5
Used Dev Size : 488383744 (465.76 GiB 500.10 GB)
Array Size : 1953534976 (1863.04 GiB 2000.42 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 19:49:43 2007
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : c8ebb897 - correct
Events : 0.2795
Layout : left-symmetric
Chunk Size : 256K
Number Major Minor RaidDevice State
this 2 8 49 2 active sync /dev/sdd1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 65 1 active sync /dev/sde1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 33 3 active sync /dev/sdc1
4 4 8 17 4 active sync /dev/sdb1
/dev/sde1:
Magic : a92b4efc
Version : 00.91.00
UUID : a9a472d3:9586c602:9207b56b:a5185bd3
Creation Time : Thu Dec 21 09:42:27 2006
Raid Level : raid5
Used Dev Size : 488383744 (465.76 GiB 500.10 GB)
Array Size : 1953534976 (1863.04 GiB 2000.42 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 19:49:43 2007
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : c8ebb8a5 - correct
Events : 0.2795
Layout : left-symmetric
Chunk Size : 256K
Number Major Minor RaidDevice State
this 1 8 65 1 active sync /dev/sde1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 65 1 active sync /dev/sde1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 33 3 active sync /dev/sdc1
4 4 8 17 4 active sync /dev/sdb1
/dev/sdf1:
Magic : a92b4efc
Version : 00.91.00
UUID : a9a472d3:9586c602:9207b56b:a5185bd3
Creation Time : Thu Dec 21 09:42:27 2006
Raid Level : raid5
Used Dev Size : 488383744 (465.76 GiB 500.10 GB)
Array Size : 1953534976 (1863.04 GiB 2000.42 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
Delta Devices : 1 (4->5)
Update Time : Fri Aug 17 19:49:43 2007
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : c8ebb8b3 - correct
Events : 0.2795
Layout : left-symmetric
Chunk Size : 256K
Number Major Minor RaidDevice State
this 0 8 81 0 active sync /dev/sdf1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 65 1 active sync /dev/sde1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 33 3 active sync /dev/sdc1
4 4 8 17 4 active sync /dev/sdb1
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