This is interesting article highlight a potential pitfall if regularly updating your VM base image with fast Clones.
The Fast Clone process simply creates a linked clone of the machine.
A Full Copy will create a new full fat copy of the image.
Fast clones create a linked image back to the master. If you keep updating and then distributing the master image in this manner you incur a performance overhead from having so many links.
Read this article for more information
http://www.danieletosatto.com/2012/05/04/creating-vms-from-templates-in-xenserver-creates-a-fast-clone/
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