Hi,
i have a tricky problem. I have a 6disk raid5 setup and did a mdadm grow chunk size.
Apparently 3 disk went missing (controller/kernel crash) and the raid failed. Disks are all ok. Backupfile for grow is there and raid config available including status(examine) of all disks.
Problem = 3 disks where in a state like
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 84bea3d7:7b697819:b8c1aa5a:a615e3b4
Name : chenbro.han.daquan.eu:2 (local to host chenbro.han.daquan.eu)
Creation Time : Sat Sep 20 12:28:57 2014
Raid Level : raid5
Raid Devices : 6
Avail Dev Size : 5856270336 (2792.49 GiB 2998.41 GB)
Array Size : 14640675840 (13962.44 GiB 14992.05 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : active
Device UUID : 67cc689a:2cdf3d4d:0c7d03d4:c12c7475
Reshape pos'n : 557547520 (531.72 GiB 570.93 GB)
New Chunksize : 512K
Update Time : Mon Sep 22 09:39:35 2014
Checksum : 25acf25d - correct
Events : 109099
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 3
Array State : ...AAA ('A' == active, '.' == missing)
and 3 in
/dev/sdf1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 84bea3d7:7b697819:b8c1aa5a:a615e3b4
Name : chenbro.han.daquan.eu:2 (local to host chenbro.han.daquan.eu)
Creation Time : Sat Sep 20 12:28:57 2014
Raid Level : raid5
Raid Devices : 6
Avail Dev Size : 5856270336 (2792.49 GiB 2998.41 GB)
Array Size : 14640675840 (13962.44 GiB 14992.05 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f74a1585:93fb850b:64667d57:42c34e52
Reshape pos'n : 557547520 (531.72 GiB 570.93 GB)
New Chunksize : 512K
Update Time : Mon Sep 22 09:02:59 2014
Checksum : 2ef3049b - correct
Events : 109096
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : AAAAAA ('A' == active, '.' == missing)
My idea was, first bringing back the disks in the array then continue the grow (using the backup file)
add / re-add disk was not working, so i assumed recreate the array with —assume-clean would bring me closer.
Question now ist, how to i get the array back to the grow process at the state of the failure?
I didnt find anything regarding this. (if even possible)
Someone any idea?
What would be the best way to tackle this problem?
Thanks
BR Martin
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