Chapter 1. Introducing XenServer Resource Pools

Xen originated as a research project at the University of Cambridge, led by Ian Pratt, senior lecturer at Cambridge and founder of XenSource, Inc. The first public release of Xen occurred in 2003. Citrix Systems acquired XenSource, Inc in October 2007 and subsequently renamed XenSource's products under the Citrix brand "XenServer".

On 21 October 2009, Citrix further announced their, now commercial, applications of XenServer would be fully open source and made freely available to the public under the name Xen Cloud Platform (XCP).

Although Citrix acquired XenSource, Xen is developed and maintained by the community as free software, licensed under the GNU General Public License (GPLv2).

Citrix XenServer ...

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