Xen
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Xen

Xen running NetBSD and three Linux distributions
Software information
DeveloperThe Xen Project, XenSource, Inc.
Initial release 2003
Stable release4.0.1
Latest release dateAugust 25, 2010
Operating systemLinux, and other Unix-like, *BSD, OpenSolaris as both hosts and guests; Microsoft Windows as the guest OS.
TypeVirtual machine monitor
LicenseGPL v2
Websitehttp://www.xen.org/

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In computing, Xen (-enˈzɛnpron) is a virtual-machine monitor for IA-32, x86-64, Itanium and ARM architectures. It allows several guest operating systems to execute on the same computer hardware concurrently. The University of Cambridge Computer Laboratory developed the first versions of Xen; the Xen community develops and maintains Xen as free software, licensed under the GNU General Public License (GPLv2).

Xen systems have a structure with the Xen hypervisor as the lowest and most privileged layer. Above this layer come one or more guest operating systems, which the hypervisor schedules across the physical CPUs. The first guest operating system, called in Xen terminology "domain 0" (dom0), boots automatically when the hypervisor boots and receives special management privileges and direct access to all physical hardware by default. The system administrator can log into dom0 in order to manage any further guest operating systems, called "domain U" (domU) in Xen terminology.

Modified versions of Linux, NetBSD and Solaris can run as the dom0. Several modified Unix-like operating systems may function as guest operating systems (domU); on certain hardware, as of Xen version 3.0, unmodified versions of Microsoft Windows and other proprietary operating systems can also run as guests if the CPU supports x86 virtualization (such CPUs include Intel VT-x and AMD-V).

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One way to migrate Xen virtual machines to KVM in Debian - SYS-CON Media (press release) (blog) Tweet this news
SYS-CON Media (press release) (blog)--When we launched our first high-availability cluster in early 2008 we chose -Xen- due to it's ability to run on non-virtualized hardware, support in Debian ... - Date : Fri, 19 Nov 2010 08:18:17 GMT+00:00
Convirture and Canonical to Team Up to Provide Virtual Machine and Private ... - San Francisco Chronicle (press release) Tweet this news
San Francisco Chronicle (press release)--Convirture, maker of the ConVirt enterprise-grade software for managing -Xen- and KVM-based virtual and private cloud environments, is partnering with ... - Date : Tue, 16 Nov 2010 20:15:26 GMT+00:00
Stonehenge gets millions for major makeover - Houston Chronicle Tweet this news
Houston Chronicle--© 2010 AP GBR -XEN- AP FILE - In this Jan. 31, 2007 file photo, visitors are dwarfed by the Stonehenge monument in southern England. ... - Date : Fri, 19 Nov 2010 00:26:37 GMT+00:00
Shared services help poor teams: AFL - ZDNet Australia Tweet this news
ZDNet Australia--"Hosted solutions are provided in the form of things like Citrix -Xen- app and Citrix -Xen- server and we've got a large datacentre down in Melbourne. ... - Date : Wed, 17 Nov 2010 05:57:57 GMT+00:00
Red Hat Enterprise Linux 6 - The H Tweet this news
The H--With this decision, the company has moved one step closer to its long-term goal of saying good-bye to -Xen-, which was the preferred virtualisation component ... - Date : Mon, 15 Nov 2010 18:54:33 GMT+00:00
Cloud Computing and the Cost of Virtualization - CTO Edge Tweet this news
CTO Edge---...- many of them are taking a page from hosting providers that make use of open source virtual machine software in the form of -Xen- or KVM. ... - Date : Fri, 19 Nov 2010 18:59:46 GMT+00:00
Platform ISF Starter Pack - Scientific Computing Tweet this news
Scientific Computing--The product supports multiple VM technologies, including ESX, -Xen-, KVM and Hyper-V, as well provisioning tools, such as Red Hat Satellite, IBM xCAT, ... - Date : Wed, 10 Nov 2010 18:54:20 GMT+00:00
Open Source and The Cloud: Go Together Like Peanut Butter and Jelly - NetworkWorld.com Tweet this news
NetworkWorld.com--From Linux to the original open source -Xen- to OpenCloud, the software infrastructure in the cloud is by and large open (except for perhaps Microsoft Azure ... - Date : Thu, 11 Nov 2010 19:34:19 GMT+00:00
Red Hat Enterprise Linux 6 improves scalability, virtualization - Ars Technica Tweet this news
Ars Technica--Red Hat has transitioned its customers away from -Xen- in favor of KVM, a native hypervisor originally developed by Qumranet that is favored in the upstream ... - Date : Thu, 11 Nov 2010 14:02:18 GMT+00:00
ACMA builds Xen-based private cloud - IDG News Service Tweet this news
IDG News Service--"-Xen- has a level of maturity in the Linux space. Citrix is adding support around it and that is a good strategy. I can't speak highly enough of it. ... - Date : Thu, 11 Nov 2010 01:37:55 GMT+00:00

Release history :
Version Release date Notes
1.0 9 September 2003
2.0 5 November 2004
3.0 16 December 2005
3.1 18 May 2007
3.2 17 January 2008 PCI passthrough and ACPI S3 standby mode for the host system.
3.3 24 August 2008 Improvements for the PCI passthrough and the power management.
3.4 18 May 2009 Contains a first version of the "Xen Client Initiative", shortly XCI.
4.0 7 April 2010 Makes it possible to use a dom0 Linux kernel, which has been implemented by using PVOps. A Linux kernel of version 2.6.31 has been modified for this purpose, because the official Linux kernel actually doesn't support the usage as dom0 kernel (date July 2010).



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