... What Live Upgrade does under solaris is it creates a complete alternate boot environment with a root /usr /var and any other filesystem you want.
I do this on my production servers, too. I just wrote a SIMPLE script which copies the contents of the file systems to other partitions, after that I just have to edit the copied /etc/fstab and reboot the system.
The first time of course I also had to reconfigure the boot loader (lilo in my case).
You can find a not yet finished report about my experience doing so. The report is in german, but it contains the self explaining script!
My script uses cp, a more elegant solution would be to use tar, but that's just optimisation.
Hope this helps give an answer to your question. I would say the answer is: may be no tool exists, because it's a to easy task for a dedicated tool ;)
Happy hacking! Patrick
-- Save software competition, use GNU/Linux and Java! And visit http://www.lugbz.org the Linux User Group in South Tyrol
