Live upgrade query

Hi All,

Is it possible to use external san disk for creating alternate boot environment and boot from it.My root disk is about 70 gb and i want to use external san disk for 272gb to create alternate boot environment.If this is possible can you please redirect me some good documents, i had searched on internet and oracle sites but could not find anything.

Oracle Solaris 10 8/11 Installation Guide: Live Upgrade and Upgrade Planning - Oracle Solaris 10 8/11 Installation Guide: Live Upgrade and Upgrade Planning