Disksuite mirroring

All, it's been quite a while since I have used Solstice DiskSuite but I had a
call today from another site and they need a hand. They currently have a few
systems with 2 disk drives and want to make a couple spare copies of the
currently running system for backups and to possibly boot additional systems
(same architecture).



They use Disksuite and have 5 partitions mirrored. Each device (d0, d1, etc.)
is made up of the standard mirror of a primary disk and mirrored disk.



D0

  D10

  D20

D1

  D11

  D21

so on.......



Question: What is the easiest way to create additional spare drives? I had
originally thought of breaking the mirror, insert new drive, prtvtoc/fmthard
(not sure if I need to newfs) so the partitions match, attach the new drive as
submirror and let the resync handle things. Once completed break mirror, move
drice to backup system and then try to boot on backup system. Any thoughts?