HP Integrity Virtual Machines Manager 4.1 Software: User Guide

Some of the basic migration requirements include the following; for complete details, see the HP
Integrity Virtual Machines Installation, Configuration, and Administration manual:
• For online migration, the source and target hosts must be running HP Integrity VM Version
4.1 or later.
• The source and target hosts must conform to the operating system requirements, and both
must be able to provide the allocated resources to the virtual machine being migrated.
• The target host must be accessible from the source host.
• Resources used by the virtual machine must be configured symmetrically on both the source
and target host.
• You can migrate guests that use both the virtual I/O (VIO) and the accelerated virtual I/O
(AVIO) drivers for storage and network. Only whole disk SAN storage and ejected file-backed
DVDs can be migrated while the virtual machine is online. File and logical volume backing
storage are not supported for online migration of virtual machines.
• Online migration requires that both the source and target VM Host be licensed and enabled
for such migration. The licensing is included with a bundle that must be installed on each
VM Host; for more information, see the HP Integrity Virtual Machines Installation, Configuration,
and Administration manual.
• Online virtual machine migration requires that the virtual machine be enabled for online
migration (the VM Host administrator can enable a virtual machine by using the hpvmmodify
-x online_migration=enabled command).
Serviceguard requirements and recommendations
For online migration of a virtual machine configured as a Serviceguard package, package switching
for the migrating virtual machine guest package is disabled before migration begins and then
re-enabled immediately after the migration finishes. Therefore, the virtual machine software is
not protected by Serviceguard during the migration process. If a failure occurs during migration,
you must manually re-enable package failover after the migration completes and restart the
virtual machine by running it on one of the Serviceguard cluster nodes.
If temporary loss of failover protection is not tolerable, disable online migration for the virtual
machine. For example, to disable the virtual machine named sgnode, run the hpvmmodify
command on the VM Host as follows:
hpvmmodify -P sgnode -x online_migration=disabled
Do not attempt online migration of a virtual machine configured as a Serviceguard cluster node.
If a Serviceguard node is migrated while online, it might lose connection to other cluster members
and be automatically removed from the cluster. Disable online migration for all virtual machines
configured as Serviceguard cluster nodes.
NOTE: VM Manager detects whether a virtual machine is configured as a Serviceguard package;
the VM Host Virtual Machines and VM Properties General tab tabs display the package icon
( ) next to the virtual machine name.
For more information about managing virtual machines with Serviceguard support, see the HP
Integrity Virtual Machines Installation, Configuration, and Administration manual.
Capacity Advisor requirements and recommendations
If Capacity Advisor is used on the virtual machine, collect utilization information before you
migrate the virtual machine. The Capacity Advisor cannot continue to collect utilization
information for the virtual machine during the migration.
102 Working with virtual machines