[CentOS] xen domU shutdown and save

Hi There,

Having some trouble discovering how to shutdown domU's without saving 
them. I have some awful power from the grid causing the backup battery 
system to initiate shutdown's on dom0, which is the desired result, 
however domU's are saving (which I don't want) and this takes a very 
long time (for whatever reason). As they shutdown, console does this
.................................on and on while it tries to save the 
domU's, past the point where the battery can sustain the dom0. So I need 
a way to consistently, gracefully deal with dom0 shutdowns (in a timely 
manner).

I have the domU's in /etc/xen/auto.

Thanks for any pointers!
W