Working With Multiple Boot Environments on the OpenSolaris OS

Working With Multiple Boot Environments on the OpenSolaris OS: "Often, developers must maintain multiple system configurations and switch back and forth among them for testing. With the introduction of ZFS in the Solaris 10 OS in 2005, you could take snapshots and clone file systems with minimal space overhead and time delay, thereby backing up and restoring environments. However, several steps were involved, particularly if the environment contained multiple file systems"