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Running Xen: A Hands-On Guide to the Art of Virtualization by Jeanna Matthews, Brendan Johnson, Patrick F. Wilbur, Jeremy Bongio, Wenjin Hu, Todd Deshane, Eli M. Dow

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Chapter 13. Guest Save, Restore, and Live Migration

In this chapter, we begin by exploring Xen’s capability to easily checkpoint the state of a guest domain to disk for quick restoration at a later time. We continue by exploring how Xen makes the migration of guest domains a simple and powerful administrative task. We discuss cold static migration, warm static migration, and live migration of guests, along with the prerequisites and benefits of each.

Representing the State of a Virtual Machine

At the heart of any migration is the ability to fully represent the state of a guest. When a guest virtual machine is completely shut down, this is trivial. An inactive Xen guest is completely defined by its file system image(s), configuration file, and its ...

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