> 
> The message "no response to Get Unit Status request", is that anything
> to worry about, or is the second drive just slow in responding (its
> device message doesn't come to the console until just after "dump
> device" (I didn't type it)?
> 
It means that the controller didn't respond to a "get next unit" request
within 10 seconds. The response is actually a interrupt that tells the
unit number on next disk, or that there is no more disks.
What's happening later is that the disk interrupts and tells that it
is available. NetBSD supports detection of new ra disks "on-the-fly",
that is what's is happening here, so it doesn't hurt.
If you want to find it earlier, just increase the timeout in mscp_subr.c
to more than 10 seconds.

-- Ragge