On Mon, October 19, 2009 3:10 am, Guy Martin wrote: > > 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 :) > Thanks for doing this testing! > Any idea how to resolve this issue ? Try pulling the very latest from my git repo. I was doing some testing like this just last week and found a number of issues which I think I have fixed. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
