also sprach Bernd Schubert [off-list ref] [2007.05.09.1417 +0200]:

Problem-1) When the disk fails, udev will remove it from /dev. Unfortunately 
this will make it impossible to remove the disk or its partitions 
from /dev/mdX device, since mdadm tries to read the device fail and will 
abort if this file is not there.

Please also see http://bugs.debian.org/416512. It would be nice if
you could keep 416512@bugs.debian.org on CC.

mdadm upstream knows of the problem. See the bug log.

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