Bug#422554: After reboot, drives marked faulty/removed get reassebled as the mirrored array instead of the healthy ones

[Neil Brown]

On Sunday May 6, bviktor at filozofia.bme.hu wrote:
> Package: mdadm
> Version: 2.5.6-9
> 
> I don't know whether this is a bug, but here's what happened.
> I had two mirrors operational /dev/hd[ac]1 and /dev/hd[ac]3 on md0 and md1, respectively.
> On Apr 23, /dev/hdc started to complain about bad sectors. I first marked it as faulty, 
> and then removed it from the array with mdadm. I didn't have physical access to the machine, 
> so I didn't remove /dev/hdc. On Apr 27, the owner of the machine rebooted the machine with ssh -> "reboot"

You marked it faulty ... so it didn't get marked faulty itself?

Do you have kernel logs from when it got marked faulty?  That might
help make it cleared what happened.

NeilBrown