HP Serviceguard Toolkit for Integrity Virtual Servers User Guide B.02.00, March 2012

6 Online VM guest package migration

Online VM Migration (OVMM) enables a running VM guest and its applications to be moved from

one VM Host to another without service interruption. SG IVS toolkit aids OVMM of

VM-as-Serviceguard-package for HP-UX guests.

NOTE: Online guest package migration is applicable only for VM.

OVMM provides minimal application downtime during planned maintenance periods on VM Hosts

and manual workload balancing between VM Hosts, while HP Serviceguard provides protection

against unplanned hardware and software failures. It also protects the guest against unplanned

VM Host hardware and software failures or failure of the VM guest itself. Throughout the migration,

all virtual machine I/O connections to storage and networks remain active.

The cmmovevpkg command performs online migration of virtual machines protected by HP

Serviceguard, with the benefit of minimizing both the planned and unplanned downtime of the

VM guest. In this case, you can migrate VM guests online with minimal interruption during planned

events, while HP Serviceguard protects the virtual machines from unplanned failures during normal

operation.

For example: # cmmovevpkg -v -P slvm1 -h xyzo2

NOTE: SG IVS toolkit does not provide protection during the actual migration process, because

it cannot monitor the VM during that period.

For more information on cmmovevpkg command, see “cmmovevpkg(1m)” manpage.

To perform an online migration of a VM-as-a-Serviceguard-package, run the cmmovevpkg command

that performs the following operations:

1. Disables Serviceguard VM guest package switching. Therefore, disables the monitoring and

failover functions. However, the VM guest continues to run on the source VM Host.

2. Migrates the VM guest to the target VM Host online using the VM migration command used

with appropriate option, automatically invoked by the cmmovevpkg command.

3. Re-enables VM guest package switching. Therefore, HP Serviceguard can monitor and failover

the VM guest.

NOTE:

• The only backing-store types permitted with Online VM migrations include “Whole disk ”and

“Shared LVM logical volumes”. If you plan to use Online VM migration with

VM-as-Serviceguard-packages, you must limit your VM guest configuration to one of these

backing-store types.

• For Integrity VM online migration support, install the “T8718AC” product.

For more information on configuration steps for SLVM and limitations of SLVM, see HP Integrity

Virtual Machines 4.3: Installation, Configuration, and Administration > Migrating VMs That are

Using Logical Volume Backing Stores.

For more information on limitations of Integrity VM on OVMM, see HP Integrity Virtual Machines

4.3: Installation, Configuration, and Administration > Restrictions and Limitations of Online VM

Migration.