I'm in a bit of a mess with mdadm and my RAID array, I'd be very grateful if anyone had any ideas.
I tried to grow my RAID 6 array consisting of 5x 3TB drives with another 3TB drive, however after 12 hours the reshape didn't appear to be making any
progress; reshape = 0.0% (0/2930265088). Unfortunately at some point I suffered power loss and upon powering on the array wouldn't start. After
googling I've read that the first moments of a reshape are critical, however as the reshape seemed to be stuck I'm hoping there's a way to recover
from this? I also read that you can define a back up file, unfortunately the guide I was following for the reshape didn't mention this, so I don't
have one. All 5 are reporting clean and correct checksums.
At the moment I don't care about trying to grow the array, I'd just like to try and recover data if possible.
Here's the output of mdadm --examine for each of the old drives.
Output of mdadm -D /dev/md127
When trying to force assemble:
And with "--invalid-backup"
Thanks very much.
I tried to grow my RAID 6 array consisting of 5x 3TB drives with another 3TB drive, however after 12 hours the reshape didn't appear to be making any
progress; reshape = 0.0% (0/2930265088). Unfortunately at some point I suffered power loss and upon powering on the array wouldn't start. After
googling I've read that the first moments of a reshape are critical, however as the reshape seemed to be stuck I'm hoping there's a way to recover
from this? I also read that you can define a back up file, unfortunately the guide I was following for the reshape didn't mention this, so I don't
have one. All 5 are reporting clean and correct checksums.
At the moment I don't care about trying to grow the array, I'd just like to try and recover data if possible.
Here's the output of mdadm --examine for each of the old drives.
Code:
root@nas:~# mdadm --examine /dev/sda
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Name : nas:Storage (local to host nas)
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 11721060352 (11178.07 GiB 12002.37 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=944 sectors
State : clean
Device UUID : f8863d07:23d5d4af:dd1d2f40:e366d96e
Reshape pos'n : 0
Delta Devices : 1 (5->6)
Update Time : Mon Jan 18 00:27:39 2016
Checksum : bc4a9451 - correct
Events : 551
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
root@nas:~# mdadm --examine /dev/sdb
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Name : nas:Storage (local to host nas)
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 11721060352 (11178.07 GiB 12002.37 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=944 sectors
State : clean
Device UUID : f38040a7:8e6d340e:ac386daa:80f03141
Reshape pos'n : 0
Delta Devices : 1 (5->6)
Update Time : Mon Jan 18 00:27:39 2016
Checksum : f743cb24 - correct
Events : 551
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
root@nas:~# mdadm --examine /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Name : nas:Storage (local to host nas)
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 11721060352 (11178.07 GiB 12002.37 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=944 sectors
State : clean
Device UUID : d829a9b5:ec6f0b86:06d406be:e508fc22
Reshape pos'n : 0
Delta Devices : 1 (5->6)
Update Time : Mon Jan 18 00:27:39 2016
Checksum : 72e72e79 - correct
Events : 551
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
root@nas:~# mdadm --examine /dev/sdd
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Name : nas:Storage (local to host nas)
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 11721060352 (11178.07 GiB 12002.37 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=944 sectors
State : clean
Device UUID : 0fbc03cd:4dfb176e:e5474a86:d7752374
Reshape pos'n : 0
Delta Devices : 1 (5->6)
Update Time : Mon Jan 18 00:27:39 2016
Checksum : 8bb92893 - correct
Events : 551
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
root@nas:~# mdadm --examine /dev/sde
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Name : nas:Storage (local to host nas)
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 11721060352 (11178.07 GiB 12002.37 GB)
Used Dev Size : 5860530176 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1960 sectors, after=944 sectors
State : clean
Device UUID : e89405bf:0fa45530:4d4bd566:3af77917
Reshape pos'n : 0
Delta Devices : 1 (5->6)
Update Time : Mon Jan 18 00:27:39 2016
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : c3e22f41 - correct
Events : 551
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
Code:
/dev/md127:
Version : 1.2
Raid Level : raid0
Total Devices : 5
Persistence : Superblock is persistent
State : inactive
Delta Devices : 1, (-1->0)
New Level : raid6
New Layout : left-symmetric
New Chunksize : 512K
Name : nas:Storage (local to host nas)
UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Events : 551
Number Major Minor RaidDevice
- 8 0 - /dev/sda
- 8 16 - /dev/sdb
- 8 32 - /dev/sdc
- 8 48 - /dev/sdd
- 8 64 - /dev/sde
Code:
root@nas:~# mdadm --assemble --force /dev/md127 /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde
mdadm: Failed to restore critical section for reshape, sorry.
Possibly you needed to specify the --backup-file
Code:
root@nas:~# mdadm --assemble --force /dev/md127 /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde --invalid-backup
mdadm: failed to RUN_ARRAY /dev/md127: Invalid argument
root@nas:~# mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Mon Aug 4 02:03:59 2014
Raid Level : raid6
Used Dev Size : -1
Raid Devices : 6
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Mon Jan 18 00:27:39 2016
State : active, degraded, Not Started
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Delta Devices : 1, (5->6)
Name : nas:Storage (local to host nas)
UUID : b4812ae8:804e182d:f813a5e1:e9ee6da4
Events : 551
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
5 8 64 2 active sync /dev/sde
3 8 32 3 active sync /dev/sdc
4 8 48 4 active sync /dev/sdd
10 0 0 10 removed
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