Foreword
With the recent release of Xen 3.1 the Xen community has delivered the world’s
most advanced hypervisor, which serves as an open source industry standard for
virtualization. The Xen community benefits from the support of over 20 of the
world’s leading IT vendors, contributions from vendors and research groups world-
wide, and is the driving force of innovation in virtualization in the industry.
The continued growth and excellence of Xen is a vindication of the project’s
component strategy. Rather than developing a complete open source product, the
project endorses an integrated approach whereby the Xen hypervisor is included as
the virtualization “engine” in multiple products and projects. For example, Xen
is delivered as an integrated hypervisor with many operating systems, including
Linux, Solaris, and BSD, and is also packaged as virtualizaton platforms such as
XenSource’s XenEnterprise. This allows Xen to serve many different use cases
and customer needs for virtualization.
Xen supports a wide range of architectures, from super-computer systems with
thousands of Intel Itanium CPUs, to Power PC and industry standard x86 servers
and clients, and even ARM-9 based PDAs. The project’s cross-architecture, multi-
OS approach to virtualization is another of its key strengths, and has enabled it to
influence the design of proprietary products, including the forthcoming Microsoft
Windows Hypervisor, and benefit from hardware-assisted virtualization technolo-
gies from CPU, chipset, and fabric vendors. The project also works actively in
the DMTF, to develop industry standard management frameworks for virtualized
systems.
The continued success of the Xen hypervisor depends substantially on the
development of a highly skilled community of developers who can both contribute
to the project and use the technology within their own products. To date, other
than the community’s limited documentation, and a steep learning curve for the
uninitiated, Xen has retained a mystique that is unmistakably “cool” but not
scalable. While there are books explaining how to use Xen in the context of
particular vendors’ products, there is a huge need for a definitive technical insider’s
guide to the Xen hypervisor itself. Continuing the “engine” analogy, there are
books available for “cars” that integrate Xen, but no manuals on how to fix the
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