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Offline migration transfers inactive definition of a domain (which may or may not be active). After successful completion, the domain remains in its current state on source host and is defined but inactive on destination host. It's a bit more clever than virDomainGetXMLDesc() on source host followed by virDomainDefineXML() on destination host, as offline migration will run pre-migration hook to update the domain XML on destination host. Currently, copying non-shared storage is not supported during offline migration. Offline migration can be requested with a new migration flag called VIR_MIGRATE_OFFLINE (which has to be combined with VIR_MIGRATE_PERSIST_DEST flag).
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>