Solaris Update 2 to 7

I need to get from Solaris 10 update 2 to update 7, whats the quickest way just apply kernel patch or live upgrade?

If it is just kernel patching can i go straight from update 2 to 7 or do I have to apply each revision level patch i.e. go from update 2 to 3 to 4 etc...

smpatch analyze will figure it all out for you. If you try it yourself it will probably work, but smpatch is meant to figure it out.

[edit]
you have to register with Oracle sun now in order to get patches. This is a "new" feature.

Thanks Jim, I'll struggle with that though as the servers are all on a private subnet. I'm a bit rusty..

I noticed the new "feature" is pretty damn aggravating...