From: Aryeh Leib Taurog <vim@aryehleib.com>
To: linux-raid@vger.kernel.org
Subject: Reassembling RAID1 after good drive was offline [newbie]
Date: Thu, 1 Jan 2015 19:40:48 +0200 [thread overview]
Message-ID: <20150101174048.GB4840@deb76.aryehleib.com> (raw)
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
next reply other threads:[~2015-01-01 17:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-01 17:40 Aryeh Leib Taurog [this message]
2015-01-01 20:54 ` Reassembling RAID1 after good drive was offline [newbie] Robert L Mathews
2015-01-02 11:01 ` Anthonys Lists
2015-01-02 14:02 ` Aryeh Leib Taurog
2015-01-02 13:01 ` Aryeh Leib Taurog
2015-01-02 18:38 ` Robert L Mathews
2015-01-04 10:20 ` Aryeh Leib Taurog
2015-01-04 11:10 ` Peter Grandi
2015-01-04 21:07 ` Aryeh Leib Taurog
2015-01-04 21:45 ` Wols Lists
2015-01-05 17:25 ` Robert L Mathews
2015-01-05 18:54 ` NeilBrown
2015-01-07 8:30 ` Aryeh Leib Taurog
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