Thanks for your help. I tried everything I knew how to do. GRUB is outside my realm of expertise. My machine would boot from each slice, but every one of them just presented the GRUB command line. I have no idea how to get a machine to boot the OS from that prompt. I found some information on the web about editing the menu item, but I didn't even have a menu to edit. I tried manually editing the menu.lst files in each slice, but that didn't seem to work either. I finally gave up.
My "solution" was to reinstall the OS on one of the disks using a ZFS root. I mounted the other mirrored disk as a UFS file system and started copying over configs and data to the ZFS pool. I am still in the process of getting the machine back up and running. Once it's configured correctly, I will mirror the data back to the other disk using ZFS mirroring. I think this will be better in the long run. I have read quite a bit about ZFS, and it looks like it will greatly benefit me. I'm just disappointed that the live upgrade didn't work and ultimately disable my system. The only real reason I took the plunge to upgrade this machine was because live upgrade was supposed to be a safe method of doing the upgrade. If I get up the courage again, I'll probably try the LU process again with my ZFS configuration instead of SVM. - Jim