I've been using software raid to mirror two devices, and recently one
of the drives went AWOL.
md1 : active raid1 sdm[0] sdc[1](F)
12884900728 blocks super 1.2 [2/1] [U_]
bitmap: 1/96 pages [4KB], 65536KB chunk
However, md1 froze, and in looking at the logs I saw this:
Oct 18 17:47:48 sys kernel: md: cannot remove active disk sdc from md1 ...
Oct 18 17:47:48 sys kernel: md: cannot remove active disk sdc from md1 ...
[root(marcus)@sanmirror3-01 ~]# mdadm --manage /dev/md1 --remove /dev/sdc
mdadm: cannot find /dev/sdc: No such file or directory
/dev/sdc was already gone! The /sys/block was already removed, no
reference to it in /proc/scsi/scsi. So md1 was destined to sit there
forever. So I rebooted and started up the degraded array.
Using kernel 3.6.2 from kernel.org
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