Xen zen? Anyone?

[David Cary Hart]

This is an exercise in intellectual curiosity. Do I understand the
concept correctly?

I see two possible applications:

        1) Running instances of FC4 and FC5 beta as virtual machines.
        Does this make sense?

        2) Splitting a server into functional virtual machines. For
        example, an instance running postfix, an instance running httpd
        and an instance for rbldnsd.

	a) Does this improve performance?
	b) Is it safe on a production server?

Thanks. 
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