The open source Xen project, led by Ian Pratt of the University of Cambridge and
XenSource Inc., will arguably have a greater impact on the enterprise software
industry than Linux has had.The Xen hypervisor is a lightweight, high-performance,
secure virtualization platform that is now collaboratively developed by more than 20
of the industry’s largest enterprise IT vendors as an open industry standard for virtualization.
Its architecture has tremendous advantages over existing virtualization technologies:
It has broad hardware support through its reuse of existing operating
systems such as Linux to safely virtualize I/O for other guests; it offers superb
resource partitioning for performance isolation and security; and it can be implemented
either as a virtualization platform or as an integrated component within an
operating system. Xen has been ported to a wide range of hardware architectures,
including x86, x86_64, the Intel Itanium, IBM’s PowerPC, the SGI Altix, and the
ARM 9. It also is ideally suited to hardware-accelerated virtualization. For these reasons,
and because Xen is freely available in source code form, every major OS vendor
has either adopted Xen or the Xen architecture as a core component of the next
major OS release for the x86 platform.
As a catalyst of change in the IT industry, the Xen project needs to scale its
knowledge and skill base so that a competent IT pro can easily get a handle on the
technology and how to deploy and use it. Cool technology can be adopted only as
fast as human users can acquire the understanding and skills to use it. Perhaps more
important, however, is the fact that the Xen project relies on the innovation of the
community to continue the development of its feature set. It is therefore a great
pleasure and also a great relief to introduce this timely, thorough, and highly accessible
guide to the art of Xen virtualization.This book demystifies Xen by placing it
in a practical context that any IT pro who wants to get something working will
immediately understand, while also providing a thorough grounding in the architecture
and implementation of the hypervisor. It also takes an important step beyond the
basics of Xen by offering a detailed tutorial on how to use the definitive platform
implementation of Xen, XenEnterprise from XenSource. Although enthusiasts may
want to dig into Xen by building it from source, most readers will be delighted to
find included with this book a CD containing the powerful free XenExpress baremetal
hypervisor from XenSource ready to install for production virtualization of
Linux and Windows guests.
It is my hope that this book will achieve two aims: encourage a new generation
of contributors to the Xen project and foster broad adoption of the Xen hypervisor
as a ubiquitous open standard for virtualization.
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