WDTalk

Xen™ – is a virtual machine environment that supports execution of multiple guest operating systems with outstanding levels of performance and resource isolation. Xen is Open Source software, released under the terms of the GNU General Public License.

Servers with – quad core processors and GB’s of RAM are ideally suited to employ virtualization to present the illusion of many smaller virtual machines, each running a separate operating system.

Virtual machines – on one dedicated server are isolated from one another, allowing concurrent execution of multiple operating systems – without allowing the execution of one to adversely affect the performance of another partition.

XEN Hypervisor – is a layer of software running directly on the server’s hardware, replacing the operating system, which allows that server’s hardware to run multiple guest operating systems concurrently. It becomes the interface for all hardware requests such as CPU, I/O, and disk for the guest operating systems.

Server virtualization benefits

• dynamic fault tolerance against software failures (through rapid bootstrapping or rebooting)
• hardware fault tolerance (through migration of a virtual machine to different hardware)
• the ability to securely separate virtual operating systems
• the ability to support legacy software as well as new OS instances on the same computer