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Is it possible to run windows under paravirtualized xen? Linux is possible because you can modify it. If you cannot run windows then what are the other alternatives to improve I/O performance?

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No, you cannot run Windows as a PV guest, but you can use PV drivers from within the HVM environment to increase performance.

"Windows falls into the category of an unmodified operating system (in other words an operating system that has not been altered specifically to run on the Xen hypervisor). Thus, paravirtualization is not an option. " --

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Yes, paravirtualization (PV) is possible. See for instance:

which lists several commercial offerings (from Citrix, Virtual Iron, and Novell), as well as some GPL'ed drivers by James Harper. See the site below:

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That’s not PV. It’s HVM. – Daniel B Jun 14 '15 at 9:09
To quote from that first link: "Before stepping into the brave new world of virtualized Windows, make sure that you’ve got a few things. First, you’re going to need a box that does HVM." – Travis Mar 17 at 15:54
@Travis, Section 6 on that same page discusses the installation of PV drivers. – billyjmc Apr 18 at 14:10

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