opensourcenet

Virtualization is the creation of a virtual (rather than actual) version of something, such as an operating system, a server, a storage device or network resources.

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  Xen is a virtual machine monitor (hypervisor) that allows you to use one physical computer to run many virtual computers—for example, running a production Web server and a test server on the same physical machine or running Linux and Windows simultaneously. Although not the only virtualization system available, Xen has a combination of features that make it uniquely well suited for many important applications. Xen runs on commodity hardware platforms and is open source. Xen is fast, scalable, and provides server-class features such as live migration