Hi,
I'm currently doing tests with the latest devel-3.1 branch to migrate
my fileserver's raid 5 array to a raid 6 array.
I thus created a raid5 test array with 3 drives and tried to grow it to
a raid 6 array with 4 drives.
This is how the array looked like before the reshape :
md0 : active raid5 sdf1[3](S) sde1[2] sdd1[1] sdb1[0]
976767872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
Using kernel 2.6.31.4, the reshape to raid 6 started as expected but
would take about 2 weeks to complete at about 400Kb/s with 4*500G
drives. I used the following command :
mdadm --grow /dev/md0 --backup-file backup -l 6 -n 4
Time is not so critical for me so I let it ran for 2 days. It was then
at about 13% and I decided to perform a reboot to see if it would
recover. Unfortunately, I now have the following output when trying to
assemble the array :
mdadm --assemble /dev/md0 /dev/sd[bdef]1 --backup-file backup
mdadm: Failed to restore critical section for reshape, sorry.
There were no usefull data on this test array but it would be nice if
this doesn't happen on my fileserver :)
Any idea how to resolve this issue ?
Thanks,
Guy
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