The userdel command won't delete the home directory unless you use the -r option. However, if the data is that critical and you could always tar it somewhere before you delete the account just to...
Also check under /etc/zones and make sure all the config files are present. You should see the index file along with the .xml files for each zone. Also, if the zones are in a separate file system...
You want copies of the meta database on both disks you're mirroring, and you would want them to have the same VTOC. If ZFS is taking up the entire physical disk then there won't be anywhere to put...