John Sequeira


Friday, February 25, 2005
Xen White Paper

Xen also offers a capability for live migration of a running OS instance (also referred to as Virtual Machine Migration). This allows a running guest OS to be moved to a second machine in a very short time. While other products on the market today claim live migration as a feature, they typically cause the migrated application to be unresponsive for tens of seconds while it is moved. Under Xen, with a feature that enables copy on write for guest OS pages, the downtime is as low as 30-60ms, orders of magnitude faster than previously available.

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