Try 'zpool import' when booted from the LiveCD to check for existing
pools. Please post your output.
Also, you can add a flag to the GRUB boot option to make your boot
verbose - this might help diagnose the hang:
Boot to GRUB
'e' for edit on the default boot option.
Assuming you are booting Op
My zfs server is hanging during restart at "Hostname = opensolaris." I'm not
sure what to do to fix the issue and get the system to reboot.
Also, I tried booting from the OpenSolaris 11.08 live cd to mount the zfs pool
and extract the data, but "zpool import rpool" returns a "No such pool found"