Hello,
we have a strange problem rebuilding a partially destroyed md raid 1,
and I hope you can help me.
Short description: We have a machine with two disks with 4 partitions
each; partitions 2, 3 and 4 each form a raid 1 (md0 = sda2/sdc2, md1 =
sda3/sdc3, md2 = sda4/sdc4). We lost a disk some days ago and I am now
trying to rebuild it with a brand new disk (here sdc). I cloned the
partition table from sda to sdc and successfully added back partitions 2
and 3 to md0 and md1, respectively. I also added partition 4 to md2, and
it starts rebuilding. I can see a "RebuildFinished Event" some hours
later in the logs, but when I look at /proc/mdstat, it looks like this:
md2 : active raid1 sdc4[1](S) sda4[0]
xxx blocks [2/1] [_U]
So the newly-added partition is listed as a spare, while md2 is running
on only one of two devices. I have no idea where this comes from, and I
see no further information in the logs. The array was initially built
with 2 devices *plus* one spare (which is to be added later on), but I
don't think this is an issue here.
We're running Linux 2.6.32 on Debian 6.0, with mdadm
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