It seems that Xen offers greater flexibility by allowing any guest OS. Yet in a paravirtualization mode it offers extremely low overhead. So it seems to me a natural path is use Xen paravirtualization for all core servers, and have the benefit of greater flexibility should we need it down the road. After all, one thing I dig about open source software is having choices. With Xen we don't sacrifice choice of OS.<br>
<br>-Ron<br><br>