What I know, What I don't know: Share what you know and what you don't know with Colin Zou. :-)

Live upgrade, I like it. I have been using it for years.
 
There is a GUI tool to perform live upgrade, a little trick is, you need run xterm first, then type lu in xterm window.

$ xhost +

access control disabled, clients can connect from any host

$ su

Password:

# xterm

Then in xterm,

# lu

By this GUI tool, you need not to remember the command names. And it is very straight forward. I tested it on both Solaris 10 and Solaris Express developer edition.

For more info about live upgrade, search document at http://docs.sun.com/