bash-3.00# luactivate sol10u_u7_srs5ea1
 A Live Upgrade Sync operation will be performed on startup of boot environment .

/usr/sbin/luactivate: /etc/lu/DelayUpdate/: cannot create
 bash-3.00# export BOOT_MENU_FILE="menu.lst"
 bash-3.00# luactivate sol10u_u7_srs5ea1
 ...
 Modifying boot archive service
 Activation of boot environment  successful.
 bash-3.00#

(c) http://groups.google.com/group/comp.unix.solaris/msg/0ff92997c4d5cb0f

PS: а в целом – удобная вещь для быстрого тестирования 🙂