Hi there,
I tried to do a chunk size change from 4096k to 64k on a 7-disk RAID6
array. I am using Debian Jessie with kernel 3.16 and mdadm 3.3.2. After
I initiated the change the process staled immediately. I could watch it
in /proc/mdadm that there has not been any progress at all. The
backup-file hasn't been touched for days now.
So I decided to backup all data from that device in case it isn't
starting at next reboot. Accidentally the system was restarted before
the backup was finished. And now the array is not assembling any more,
even with the correct --backup-file. I get "mdadm: Failed to restore
critical section for reshape, sorry.".
So the first question is: How can I access the data again? I think there
is no damage at this time- I appended an output from --examine at the
end of this message. All seven drives giving me the same output in all
relevant topics. Especially "Chunk Size", "New Chunksize" and "Reshape
pos'n" is all the same.
What is the best way now that I do not damage any data?
Second question: Is the problem with the level change a known bug?
Thanks for reading!
--
/dev/disk/by-partlabel/hyper_TA_1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x5
Name : hyper:TA (local to host hyper)
Raid Level : raid6
Raid Devices : 7
Avail Dev Size : 3434725376 (1637.80 GiB 1758.58 GB)
Array Size : 8586813440 (8189.02 GiB 8792.90 GB)
Data Offset : 147456 sectors
Super Offset : 8 sectors
Unused Space : before=147368 sectors, after=0 sectors
State : clean
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 0
New Chunksize : 64K
Update Time : Thu Mar 31 17:57:01 2016
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : e7172c1f - correct
Events : 527046
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 5
Array State : AAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
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