Jerry mentioned in another e-mail about Xen, an Open Source software package that provides server virtualization.


In all honesty, I have no idea what that means. Every VM or emulator I have dealt with (VMWare, CoLinux, VirtualPC, etc.) has two parts: a host operating system and a guest operating system. What I have not been able to figure out is what the guest/host OSes Xen works with. Linux is mentioned, but as a guest or as a host? Windows is mentioned, but again, as a guest or a host?

The four big questions in my mind:

 - can I run Linux on Linux (a la UML)?
 - can I run Windows on Windows (a la VirtualPC)?
 - can I run Linux on Windows (a la VMWare)?
 - can I run Windows on Linux (a la VMWare)?

Or is Xen it's own host OS? That is, Xen is the host and you run all other OSes as guests?

The Xen site has been pretty slow for me, so I haven't been able to read through everything, yet:

  http://www.cl.cam.ac.uk/Research/SRG/netos/xen/

Regards,
- Robert
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