Migration+dry-run

Migration Features and Issues in the OpenSolaris 2010.05 Release

About Migration

The following prerequisites apply:

1. Both the source machine and the target host must be on the same subnet.

2. The host and the target must each have the same CPU type (AMD or Intel).

3. Both systems must be running the same release of the xVM software.

4. There must be sufficient CPU and memory resources on the target to host
the domain.

5. The target dom0 should have the same network interface as the source
dom0 network interface used by the domU. For example, if the domU to be
migrated has a VNIC that is bridged over the e1000g0 interface on the
source dom0, then the target dom0 must also have the e1000g0 interface.

Migration Dry Run

The dryrun option does basic validation of
the domain configuration before the migration is
performed. It tests items such as:

• Device availability

• Simple checks for memory usage and CPU vendor

The dry-run feature is implemented in the migrate
subcommand of virsh:

virsh migrate --live | --dryrun domain dest_uri [migrate_uri]

Migrate the domain to the host  specified  by  dest_uri.
The  optional  migrate_uri is a separate URI that
specifies a transport method between the host and  
destination.

--live
Attempt a live migration.

--dryrun

Use this option to test  whether  a  domain  can  be
migrated  successfully to a remote host. This option
also works on a non-running domain.  Note  that  the
checks  are  not necessarily complete: migration may
still fail to work properly even if a dry-run migration
passes.