Holy cow, I poked it with a stick and I think I did it!
As I've wrote before after a reboot the array was there but didn't
start, and I've noticed the same thing happend with the overlay files
right after I created them:
# /cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath]
[raid0] [raid10]
md1 : inactive dm-0[8](S) dm-1[6](S) dm-7[4](S) dm-6[2](S) dm-5[0](S)
dm-3[1](S) dm-4[5](S) dm-2[3](S)
23429580800 blocks super 0.91
# mdadm --detail /dev/md1
/dev/md1:
Version : 0.91
Raid Level : raid0
Total Devices : 8
Preferred Minor : 0
Persistence : Superblock is persistent
State : inactive
New Level : raid6
New Layout : left-symmetric
New Chunksize : 64K
UUID : 7a58ed4f:baf1934e:a2963c6e:a542ed71
Events : 0.12370980
Number Major Minor RaidDevice
- 252 0 - /dev/dm-0
- 252 1 - /dev/dm-1
- 252 2 - /dev/dm-2
- 252 3 - /dev/dm-3
- 252 4 - /dev/dm-4
- 252 5 - /dev/dm-5
- 252 6 - /dev/dm-6
- 252 7 - /dev/dm-7
Now I tried
# mdadm --run /dev/md1
mdadm: failed to start array /dev/md1: Input/output error
and something interesting happend:
# mdadm --detail /dev/md1
/dev/md1:
Version : 0.91
Creation Time : Thu Sep 1 22:23:00 2011
Raid Level : raid6
Used Dev Size : 18446744073709551615
Raid Devices : 7
Total Devices : 6
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Tue Jan 24 21:10:19 2017
State : active, FAILED, Not Started
Active Devices : 4
Working Devices : 6
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric-6
Chunk Size : 64K
New Layout : left-symmetric
UUID : 7a58ed4f:baf1934e:a2963c6e:a542ed71
Events : 0.12370980
Number Major Minor RaidDevice State
0 252 5 0 active sync /dev/dm-5
1 252 3 1 active sync /dev/dm-3
2 252 6 2 active sync /dev/dm-6
3 252 2 3 active sync /dev/dm-2
- 0 0 4 removed
- 0 0 5 removed
6 252 1 6 spare rebuilding /dev/dm-1
8 252 0 - spare /dev/dm-0
let's try to add the missing drives:
# mdadm --manage /dev/md1 --add /dev/mapper/sdc3
mdadm: re-added /dev/mapper/sdc3
# mdadm --manage /dev/md1 --add /dev/mapper/sdd3
mdadm: re-added /dev/mapper/sdd3
# mdadm --detail /dev/md1
detail /dev/md1
/dev/md1:
Version : 0.91
Creation Time : Thu Sep 1 22:23:00 2011
Raid Level : raid6
Used Dev Size : 18446744073709551615
Raid Devices : 7
Total Devices : 8
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Tue Jan 24 21:10:19 2017
State : active, degraded, Not Started
Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric-6
Chunk Size : 64K
New Layout : left-symmetric
UUID : 7a58ed4f:baf1934e:a2963c6e:a542ed71
Events : 0.12370980
Number Major Minor RaidDevice State
0 252 5 0 active sync /dev/dm-5
1 252 3 1 active sync /dev/dm-3
2 252 6 2 active sync /dev/dm-6
3 252 2 3 active sync /dev/dm-2
4 252 7 4 active sync /dev/dm-7
5 252 4 5 active sync /dev/dm-4
6 252 1 6 spare rebuilding /dev/dm-1
8 252 0 - spare /dev/dm-0
Not bad at all! But it still won't start, even with --run. Maybe if I
wait long enough for the rebuild to finish? But I still don't see it in
/proc/mdstat and I don't want to wait for several days to see if it
really rebuilds in the background.
So I poke it with a stick...
# echo "clean" > /sys/block/md1/md/array_state
-bash: echo: write error: Invalid argument
nope
# echo "active" > /sys/block/md1/md/array_state
-bash: echo: write error: Invalid argument
nope
# echo "readonly" > /sys/block/md1/md/array_state
wait, no error?
# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath]
[raid0] [raid10]
md1 : active (read-only) raid6 dm-0[5] dm-2[4] dm-7[6] dm-6[3] dm-4[0]
dm-1[2] dm-5[1] dm-3[8](S)
14643488000 blocks super 0.91 level 6, 64k chunk, algorithm 18
[7/6] [UUUUUU_]
resync=PENDING
bitmap: 175/175 pages [700KB], 8192KB chunk
# mdadm --detail /dev/md1
/dev/md1:
Version : 0.91
Creation Time : Thu Sep 1 22:23:00 2011
Raid Level : raid6
Array Size : 14643488000 (13965.12 GiB 14994.93 GB)
Used Dev Size : 18446744073709551615
Raid Devices : 7
Total Devices : 8
Preferred Minor : 1
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Jan 24 21:10:19 2017
State : clean, degraded, resyncing (PENDING)
Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric-6
Chunk Size : 64K
New Layout : left-symmetric
UUID : 7a58ed4f:baf1934e:a2963c6e:a542ed71
Events : 0.12370980
Number Major Minor RaidDevice State
0 252 4 0 active sync /dev/dm-4
1 252 5 1 active sync /dev/dm-5
2 252 1 2 active sync /dev/dm-1
3 252 6 3 active sync /dev/dm-6
4 252 2 4 active sync /dev/dm-2
5 252 0 5 active sync /dev/dm-0
6 252 7 6 spare rebuilding /dev/dm-7
8 252 3 - spare /dev/dm-3
still no error
# echo "clean" > /sys/block/md1/md/array_state
# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath]
[raid0] [raid10]
md1 : active raid6 raid6 dm-0[5] dm-2[4] dm-7[6] dm-6[3] dm-4[0] dm-1[2]
dm-5[1] dm-3[8](S)
14643488000 blocks super 0.91 level 6, 64k chunk, algorithm 18
[7/6] [UUUUUU_]
[==============>......] reshape = 74.6% (2185464448/2928697600)
finish=7719.3min speed=1603K/sec
bitmap: 175/175 pages [700KB], 8192KB chunk
14643488000 blocks super 0.91 level 6, 64k chunk, algorithm 18
[7/6] [UUUUUU_]
resync=PENDING
bitmap: 175/175 pages [700KB], 8192KB chunk
# mdadm --detail /dev/md1
/dev/md1:
Version : 0.91
Creation Time : Thu Sep 1 22:23:00 2011
Raid Level : raid6
Array Size : 14643488000 (13965.12 GiB 14994.93 GB)
Used Dev Size : 18446744073709551615
Raid Devices : 7
Total Devices : 8
Preferred Minor : 1
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Jan 31 20:09:30 2017
State : clean, degraded, reshaping
Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric-6
Chunk Size : 64K
Reshape Status : 74% complete
New Layout : left-symmetric
UUID : 7a58ed4f:baf1934e:a2963c6e:a542ed71
Events : 0.12370982
Number Major Minor RaidDevice State
0 252 4 0 active sync /dev/dm-4
1 252 5 1 active sync /dev/dm-5
2 252 1 2 active sync /dev/dm-1
3 252 6 3 active sync /dev/dm-6
4 252 2 4 active sync /dev/dm-2
5 252 0 5 active sync /dev/dm-0
6 252 7 6 spare rebuilding /dev/dm-7
8 252 3 - spare /dev/dm-3
Looks good! fsck shows no errors, nothing in lost+found, so I've stopped
the reshape (so the overlays won't fill the disk), mounted it readonly
and backed up the more important data. That finished today, so I
rebooted and did it for real. Reshape is finished, resync at 24% (6
hours to go), fsck still looks good. w00t!
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