Hi markus, > I suggest that after assembling the array, you 'fsck' the filesystem > on md0 just to make sure that the data is fine and then simply hot-add > the third device: > mdadm /dev/md0 -a /dev/sdc > > If fsck reports lots of error..... maybe try force the assmbly from a > different pair of drives. e.g. > mdadm -A --force /dev/sda1 /dev/sdc2 > > and then do the fsck. Oh, and if you try this: DON'T allow fsck to change/fix anything on the disks if you want to later try a different combination - data corruption is pretty much guaranteed if you allow any writes and then change to a different set of disks. Bye, Martin PS: not sure what happens if you're using a journaling fs on the raid - I think fsck replays the journal before checking, so trying out different combinations of disk doesn't look like a viable option in that case? - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html