Multiple boot environments enable administrators to switch between one or more boot environments on an as-needed basis. You can manage multiple boot environments on a solaris10 zone. For example, from a solaris10 zone, you can create and upgrade packages on an alternate boot environment. You can then activate and boot to the upgraded boot environment to perform administration tasks.
You activate an alternate boot environment by using ZFS commands. Set the zfs property com.oracle.zones.solaris10:activebe on the zone's ROOT dataset. Reboot the zone to have the new zfs property take effect.