On Tue, 7 May 2013 14:08:14 +0200 Ole Tange <tange@xxxxxxxxxx> wrote: > On Tue, May 7, 2013 at 1:54 PM, NeilBrown <neilb@xxxxxxx> wrote: > > On Tue, 7 May 2013 13:36:56 +0200 Ole Tange <tange@xxxxxxxxxx> wrote: > > > >> I am expanding my 9 harddisk RAID6 to 10 harddisk RAID6: > : > >> It is, however, hanging the system. > : > >> # Do the reshape > >> mdadm -v --grow /dev/md1 --raid-devices=10 > >> --backup-file=/root/back-md1 > >> mdadm: Need to backup 7168K of critical section.. > > This completed - did not hang. > > > What does > > grep . /sys/block/md1/md/* > > show? Or does it hang? > > Hangs (ctrl-c works). > > > What about "mdadm --examine /dev/sd*" > > https://gist.github.com/anonymous/5532063 > > The disk box contains more drives than just the array in question. The > interesting array is: 242d6530:e2562ecb:1dcd2a97:15a1a868 > > > Did the "mdadm --grow" appear to complete, and return to the shell prompt? > > Yes. > > > What kernel version? What mdadm version? > > $ mdadm --version > mdadm - v3.2.5 - 18th May 2012 > > $ uname -r > 3.2.0-0.bpo.1-amd64 > > > A hanging /proc/mdstat is definitely not a good sign. The "got signal ... > > exiting" isn't good either. I would expect more messages with that. > > You didn't just "grep md" in dmesg did you? That is a complete dmesg output > > for the entire time period that could possibly be relevant? > > dmesg of controller upgrade (after which everything worked fine) > followed by --grow at 4328065.432267 > > https://gist.github.com/anonymous/5532093 > > /Ole Thanks for the extra info. I can't find any smoking gun unfortunately. What does "ps axgu" show. I'm particularly looking for processes in 'D' state. If there are any, particularly if they are md related, try cat /proc/$PID/stack for appropriate values of $PID Maybe also try echo t > /proc/sysrq_trigger and see what gets into 'dmesg' - hopefully your dmesg buffer is big enough to hold the important stack traces. If you get anything from either of those, please post. NeilBrown
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