The Disadvantages of Using Citrix XenServer
Even with the high-end Essentials product, there's a trade-off between stability and features. Citrix exposes only those hypervisor features that they feel are mature enough to use in a production environment. For example, migration was added a couple of years after it had been introduced in the open source version.
There's also no easy way of moving VMs between open source and commercial Xen at the moment. (You can, of course, move VMs manually by using the lower-level methods outlined in Chapter 9.) If you standardize on open source or commercial Xen, it may be difficult to reverse that decision later, although the Open Virtualization Format (OVF), which has some support from open source tools,[66
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