On Mon, May 6, 2013 at 8:44 AM, NeilBrown <neilb@xxxxxxx> wrote: > On Thu, 2 May 2013 13:56:09 +0200 Ole Tange <tange@xxxxxxxxxx> wrote: > : >> I thought this would be enough: >> >> mdadm -v --grow /dev/md1 --raid-devices=10 --backup-file=/root/back-md1 : >> The last command works, but the 2 first commands fail with: >> >> mdadm: Need to backup 7168K of critical section.. >> mdadm: /dev/md2: Something wrong - reshape aborted : > Very sensible to test first. However to reshape a RAID6 from 9 to 10, you > need each device to be at least 7*8*chunksize*2 - possibly a bit more than > that. > Your script uses a chunksize of 128K, so you need at least 15Meg > Your script creates 1Meg devices. > > Try your test with a much smaller chunk size and a somewhat larger device > size. Spot on. If I adjust the size of the loop-back devices to 30M instead of 1M, then everything works. /Ole -- 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
