On Sun, 21 Jul 2013 06:26:55 -0400 "Justin Piszcz" <jpiszcz@xxxxxxxxxxxxxxx> wrote: > Hi, > > When I run repair on an MD-RAID1 sync_action, the speed slows down and it > stays like this (below) for hours. > > The system is then completely unresponsive to user input. I have replaced a > failing SSD; however, after a check, mismatch_cnt seems to increase over > time. When I run repair, the system freezes to user-input. Has anyone else > run into this issue with a RAID-1 volume (2 x SSD) using 0.90 metadata? > Long ago I used to use this same configuration with two physical disks and > there was never a problem. > > Even though I left a root shell open, this has no effect to break the > resync: > # echo idle > /sys/devices/virtual/block/md1/md/sync_action > > Every 1.0s: cat /proc/mdstat Sun Jul 21 06:15:38 > 2013 > > Personalities : [raid1] > md1 : active raid1 sdc2[0] sdb2[1] > 233381376 blocks [2/2] [UU] > [>....................] resync = 0.0% (151616/233381376) > finish=36171.5min speed=107K/sec > > md0 : active raid1 sdc1[0] sdb1[1] > 1048512 blocks [2/2] [UU] > > unused devices: <none> > > 10 minutes later: > > 233381376 blocks [2/2] [UU] > [>....................] resync = 0.0% (151616/233381376) > finish=52219.3min speed=74K/sec > > Where it hangs (151616) or elsewhere, has been different each time I watched > it, it does not appear to be hanging at the same block each time. > Hi Justin, this is a known bug. Fix has been accepted into mainline for 3.11-rc2. Hopefully it will get into 3.10.3 (too late for 3.10.2). NeilBrown
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