On Fri, 6 Apr 2012 03:01:26 -0400 Bryan Bush <bbushvt@xxxxxxxxx> wrote: > If you have 2 failed drives in a raid 6 array, will it rebuild them > both at the same time or in serial? Maybe. Probably not, but it can be coaxed to. The next release of mdadm will contain http://neil.brown.name/git?p=mdadm;a=commitdiff;h=9f58469128c99c0d7f434d28657f86789334f253 which will ensure that if you: mdadm /dev/md0 --add /dev/foo /dev/bar then both will be added before the recovery starts, so both will be recovered at the same time. Alternately you could: echo freeze > /sys/block/md0/md/sync_action mdadm /dev/md0 --add /dev/foo /dev/bar echo idle > /sys/blcok/md0/md/sync_action you might even be able to leave of the first step. The "add" will cause a recovery to start on just one device, but then when you write 'idle', it will abort the recovery, automatically restart, but this time will use all available spares. NeilBrown
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