On Tue, 25 Nov 2014 12:49:12 +1100 Jonathan Molyneux <jonathan@xxxxxxxxxxxxxxxxxxxx> wrote: > Hi Everyone, > > Have a strange situation that hasn't happened before. > Running Debian 7.7 with kernel version 3.2.63-2+deb7u1. > Have a raid10 that runs the server (boot's off a raid1) that after > replacing a failed disk, just won't rebuild. > > This is what it looks like without the disk (failed & removed): > md1 : active raid10 sda2[6] sdc2[4] sdb2[1] > 1952987136 blocks super 1.2 512K chunks 2 far-copies [4/3] [UUU_] > bitmap: 8/15 pages [32KB], 65536KB chunk > > Then when the disk is added: > md1 : active raid10 sdd2[5](S) sda2[6] sdc2[4] sdb2[1] > 1952987136 blocks super 1.2 512K chunks 2 far-copies [4/3] [UUU_] > bitmap: 8/15 pages [32KB], 65536KB chunk > > Nothing unusual is being spat out in dmesg. > When removing the disk: > [313434.073997] md: unbind<sdd2> > [313434.138307] md: export_rdev(sdd2) > When adding the disk: > [313468.056484] md: bind<sdd2> > > This is a strange one that I haven't had before. > Any thoughts on how to kick the rebuild off without needing a reboot ? I'm sure I've seen this bug before... and fixed it. I don't remember the details and cannot find anything obvious in change logs. You could try echo recover > /sys/block/md1/md/sync_action Alternately, if you are re-adding a disk that had just been removed, you could mdadm /dev/md1 --remove /dev/sdd2 mdadm --zero /dev/sdd2 mdadm /dev/md1 --add /dev/sdd2 that will force a full recovery instead of just a bitmap-based recovery. That will of course take longer than a bitmap-based recover, but seeing the bitmap based recovery isn't starting, that could still be an improvement. NeilBrown
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