Hi all,
I had a config with 5 disks and 3 raid 5 arrays:
md2 : system root
md3 : swap
md4 : data
I added a 6th disk with the intention of growing my raid5 into raid6.
The step I used were :
# mdadm /dev/mdX -a /dev/newdiskX
# mdadm -G --level 6 -n 6 /dev/mdX --backup-file /mdXbackup
(yes, with backup file on root partition md2...)
The md3 array reshaped without any problem.
md2 seemed to reshape well until it reaches 50.4%, then the rebuild speed stalled at 14Kb/s.
md4 was still in the state "resync=DELAYED" then.
As the rebuild process seemed hung, I restart the machine ... bad idea.
Now mdadm refuses to assemble md2 and md4, and displays this message :
mdadm: Failed to restore critical section for reshape, sorry.
Possibly you needed to specify the --backup-file
md2 is my linux installation, not very bad if I lose this one.
md4 however contains valuable data.
While md4 was still in the state resync=DELAYED before the shutdown, I expect
it should not has been (to much) modified and can be recovered.
Any idea on how I could safely do it ?
Should I give a try to the hack "Get 'Grow_restart' to always return 0."
mentionned by Neil Brown on 22 april 2010 in this mailing list ?
Thank for any advices,
Cheers,
--
Simon S
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