Benjamin Schieder wrote:

root@crazyhorse:~# mdadm /dev/md/2 -r /dev/hdh5
mdadm: hot remove failed for /dev/hdh5: No such device

md1 and md2 are supposed to be raid5 arrays.

You are probably using udev, don't you? Somehow there's presently
no /dev/hdh5, but to remove /dev/hdh5 out of the raid, mdadm needs this
device. There's a workaround, you need to create the device in /dev using
mknod and then you can remove it with mdadm.

We are presently running into a similar problem, which I'm going to describe
on this and hotplug list right now.


Hope it helps,
Bernd