Xen, VT, and RAID

I'm putting together a new server that will use RAIDframe
for RAID-1 on
two drives.  I plan to run FreeBSD in an fdisk partition
using the VT
support in Xen 3.  The question is what do I do about RAID
and that
partition?  

Once choice is to do nothing, and use the corresponding
space on the
second drive for something else.  A second is to use
FreeBSD's geom
mirror on that part of both drives.  I have no idea if that
will work.
A third choice -- is there a third choice?


		--Steve Bellovin, http://www.cs.columbi
a.edu/~smb