Lets say you have two disks. c0t0d0s0 with the original installation and c0t1d0s0 as the clone. Booting in single user mode is not required as long as you stop most of your services. Letting ssh run and do actually the cloning is ok. First we copy the partition table: $ prtvtoc /dev/rdsk/c0t0d0s0 > /tmp/bla $ [...]