Xen


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Xen

Open source virtualization software that is used to partition workstations and servers into separate virtual machines, each containing its own copy of an OS. Pronounced "zen," and developed at the University of Cambridge in the U.K., Xen is noted for its fast response and low overhead. Xen is a small, low-level "hypervisor," which is the first control software loaded when the computer starts up.

Originally developed for x86 machines, support for the IA-64 (Itanium) and POWER5 (Mac) platforms followed. Xen began gaining wide acceptance in the Linux server market in the 2005 time frame.

The OS Must Be Ported
Xen uses one or more privileged "guest" operating systems for handling the actual device drivers for the hardware. Known as "paravirtualization" and unlike VM environments where the OS runs as is, the OS that runs on top of Xen must be programmed to call Xen virtual drivers, which, in turn, call the real drivers. Linux and versions of Unix were the first operating systems ported to Xen.

Because the real drivers run outside of Xen, the machine can always be booted into a consistent, secure base personality. In addition, a virtual machine (OS and apps) can be moved to another server and continue running in a matter of seconds.

No Porting for Hardware Virtualization
There is no requirement to port the operating system to Xen if the hardware platform offers support for virtualization, such as Intel's VT, AMD's AMD-V and IBM's POWER architecture. For more information, visit www.xen.org. See XenServer, XenSource, virtual machine, VT, AMD-V and paravirtualization.


A Xen Virtual Machine
Xen uses one or more privileged guest operating systems for driver control, and other operating systems communicate via Xen virtual drivers.
References in periodicals archive ?
Xen has become an open source industry standard for virtualization because it leads the industry in performance and support for leading server and PC systems," said Ian Pratt, creator of Xen and founder of Xen.
The Xen hypervisor is a unique open source technology, developed collaboratively by the Xen community and engineers at over 20 of the most innovative data center solution vendors, including AMD, Citrix, Cisco, Dell, HP, IBM, Intel, Mellanox, Network Appliance, Novell, Red Hat, SGI, Sun, Unisys, Veritas, and Voltaire.
Virtualization solutions like Xen can help clients simplify their infrastructure and reduce the complexity of a data center," said Rich Lechner, vice president, Virtualization and IT Optimization, IBM.
Pharmaceutical company Allergan plc (NYSE:AGN) reported on Tuesday the receipt of the US Food and Drug Administration (FDA) clearance for the XEN Glaucoma Treatment System for the management of refractory glaucomas in the US.
When the System Software team at Xilinx[R] and DornerWorks brought up the Xen Project hypervisor on Xilinx's Zynq[R] UltraScale+[TM] MPSoC, we found that we could run the popular 1993 videogame "Doom" to demonstrate the system working and test it.
However, the embryo produces not only pluripotent stem cells, but also XEN cells, a stem cell type with unique properties.
Provider of utility metered public, private, and hybrid cloud infrastructure management solutions, 6fusion, announced on Wednesday that it has expanded its cloud computing platform to support the Open Source and Citrix Xen platforms.
I know we're all sick to the teeth of new tanning products being released every other day but Xen-Tan, spelt Xen but it's pronounced zen, certainly has healing powers.
org, part of Citrix, has launched a new version of the Xen open source hypervisor.
THE BOOK OF XEN covers the open source virtualization tool and explains everything needed to use Xen, from its installation and customization to virtual storage.
For administrators, Xen can prove to be a solid back up tool that will allow access for many in your company, no matter what operating system they use, while being easy to manage.
Prospective customers can get to know the pioneering Xen Family, receive a quote for weekly costs and go ahead and order the machine of their choice.