This
is possible because the guest operating systems are all "aware" that they are running
in the Xen hypervisor. The architecture of a Xen system with two guest domains is
as follows:
Chapter 1
[ 9 ]
What Can I Do with It?
Here are some of the cool things that you can do with Xen:
Decrease hardware cost: Reduce the physical space and power requirements
by utilizing Xen to decrease the number of maintained physical servers.
Improve security: Protect applications and operating systems by isolating
them into virtual machines. We will discuss security in Chapter 7.
Increase server utilization: Consolidate servers to simplify the server
management and improve server utilization. This will enable you to
use more modular and scalable deployments and centralize the server
management. We will learn about the tools for managing domains in
Chapter 4.
Maintain SLA: Utilize the live relocation of Xen domains to avoid downtime
and maintain your service level agreements. We will explore the migration
and backup capabilities of Xen in Chapter 8.
Lower TCO: Adopt the open-source Xen with its tremendous performance
benefits and low cost to lower the TCO for your data center or
enterprise systems.
Improve QA: Easily test your applications on multiple operating systems
without setting up multiple hardware environments.
Provision systems: Provision applications and systems dynamically,
quickly, and just in time, by moving virtual machines from one server to
another as needed, instead of spending time setting up a new physical server
environments.
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