Hi Mates, We have a complex env. with root on ZFS, zones and zpools and booting environments. I have been experiencing lots of issues (now and then) while using the LU feature to patch OS. I usually end up fixing mountpoints, promote lingering databsets etc. So I am now inclined of "still" using LU to patch systems but before touching the system, I am planning to do "zpool split rpool rpool2" to be on the safer side! I know booting from rpool is not clean yet and gives some errors like dump,swap,vfstab etc.. but at least you have option to failback! I am inclined bcos one of my mates, lost major zone/zonepath (on zfs ds) while trying to fix mountpoint / promote clone etc... What say? Regds, Nitin -- This message posted from opensolaris.org