The article states that Xen previously supported only Linux and NetBSD. Unfortunately, not only do XenSource's commercial Xen offerings (Version 4) not officially support NetBSD, but in actual practice.. NetBSD installation process does not work on this virtualization platform: there is no documented NetBSD installation that works.
No other flavor of BSD is known to work, either (I believe OpenBSD comes the closest to working).
It's very surprising to find the Open Source version of Xen is actually superior to the commercial, paid, supported version of Xen in terms of supporting more OSes, and being able to be configured with high availability functions such as NIC bonding, plus VM snapshotting+clustering using heartbeat.
The commercial version may provide better performance. However, High Availability and multiple OS support are extremely important for consolidating data centers, and for now, Xen only
seems to support two OSes: Linux and Windows.
Until they add *BSD, Solaris support, and High Availability support, I don't think the product can stand as an equally good competitive alternative to VMware, just yet.
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