Due to an unscheduled powercycle on my linux server, I got a very troubling page from mdadm, the multi-disk administrator, saying it had marked one of the disks as failed.
This, presumably, was due to a flaky SATA controller that didn’t make /dev/sda available by the time the kernel was mounting /dev/md0, so software raid turned it off.
It was easy enough to get the drive back into play:
sudo mdadm /dev/md0 --add /dev/sda1
And easy enough to monitor progress:
mrm@gronk:~$ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 sda1[3] dm-2[1] dm-1[0] 580074880 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_] [====>................] recovery = 22.0% (63875072/290037440) finish=178.1min speed=21154K/sec
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