I recently made a RAID1 array from a couple of extra usb drives:
$ mdadm --create --metadata 1.2 --verbose /dev/md/backup --level=mirror -n2 /dev/sd[cd]2
I'm using it for my backups. I've run into a small problem though.
One of the drives for some reason hadn't come online when I tried to
assemble the array. Trying --assemble a second time after it came online
apparently wasn't the right thing to do:
$ mdadm --assemble --scan
mdadm: /dev/md/backup has been started with 1 drive (out of 2).
$ mdadm --assemble --scan
mdadm: /dev/md/backup has been started with 1 drive (out of 2).
$ cat /proc/mdstat
Personalities : [raid1]
md126 : active (auto-read-only) raid1 sdc2[0]
943587136 blocks super 1.2 [2/1] [U_]
md127 : active (auto-read-only) raid1 sdd2[1]
943587136 blocks super 1.2 [2/1] [_U]
AFAIK both drives are healthy, but since that happened, it refuses to
assemble them both in the array:
$ mdadm --assemble --force /dev/md/backup /dev/sd[db]2
mdadm: ignoring /dev/sdb2 as it reports /dev/sdd2 as failed
mdadm: /dev/md/backup has been started with 1 drive (out of 2).
I haven't mounted the volume, so I believe the drives are in sync.
Is there any way to put the array back together without having to
resync? It looks like I want something like --assume-clean, but that
flag isn't valid in assemble mode.
Please cc responses to me.
Thanks,
Aryeh Leib Taurog
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