This is an awesome link for how to create a bootable ZFS root mirror in Indiana OpenSolaris 2008.05, which is what I think you're trying to do:
http://darkstar-solaris.blogspot.com/2008/09/zfs-root-mirror.html It works like a charm. If one hard drive goes bad, you can just boot up from the other one without having to mess around, and that's pretty much how I set up my ZFS mirrored software RAID configuration. Later on I shrunk the size of my windows partition on a third drive so that I could format the rest of the empty space on that third drive as a Solaris partition and then I had ZFS mirror my data on three drives (just because I'm extra paranoid). But doing that was more involved and would be the topic of another discussion thread. Try out the method in the link I posted and keep us updated on how well it works. -- This message posted from opensolaris.org
