mdadm create,, raid array is not clean

dbj · 11-16-2009, 04:41 PM

I do
mdadm --create /dev/md1 --level=1 --raid-disks=2 missing /dev/sdb1

and I get

md1: raid array is not clean -- starting background reconstruction

Why is it not clean?
Should I be worried?

The HD is not new it has been used in before in a raid array but has been repartitionated.

indienick · 11-16-2009, 05:16 PM

I wouldn't worry about it. But then again, someone who knows better than I probably will tell you if you should be worried.

I don't think you should be worried about it, simply because I got this message after a power failure had one of our servers (at work) just turn off (ungracefully). After the RAID reconstruction, the array should be fine.

mostlyharmless · 11-16-2009, 05:36 PM

Quote:

Why is it not clean?

I'm guessing because mdadm sees the old raid data.

Quote:

Should I be worried?

No