You can use two different techniques to migrate a domain. You can save a copy of
the domain and then restore the domain on a different server, or you can migrate a
domain while it is running, causing minimal service interruption.
We will use the following ways to migrate a domain:
Save and restore a domain
Live migration
Migration Requirements
The following are the setup and network requirements for migration:
Both the source host and destination host must be running Xen and the
xend daemon.
The destination host must have enough disk space, memory capacity, and
resources to run the domain after the migration.
The source host and destination host machines must have the same
architecture and virtualization extensions. For example, if the source host
is running on x86-64 architecture with extensions, then you must ensure that
the destination host does the same. This is stipulated so that you don't
run into any mismatches in the instruction sets used by the kernel and the
user libraries.
The source host and destination host machines must be on the same
layer-2 network subnet. When a domain is migrated, the migration will not
be completed successfully if the destination node is on a different subnet, as
the MAC and IP addresses of the domain are moved with it.
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Migration
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The process of migration causes the xend daemon to stop the domain
running on the source host, copy it over to the destination host, and then
restart the domain.
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