At first, I used 3 SCSI hard drives, but could not figure out for the life of me what the names were... Kept getting I/O errors when I ran tools to find out.
Redid it as 3 (cuz the CDRom took one of the slots) IDE drives (1GB each).
AVAILABLE DISK SELECTIONS:
# zpool create mypool raidz c0d0 c0d1 c1d1
# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
mypool 2.95G 157K 2.95G 0% ONLINE -
So far so good. It doesn't have Xen support yet, and I don't really feel like trying it right now since it is a LiveCD and all changes are lost when I reboot the vm -- maybe later.