HP vPars and Integrity Virtual Machines V6.1 Administrator Guide

The basic virtual machine or vPar migration environment includes a source machine and a target
machine. Both must be running vPars and Integrity VM V6.1 and must be able to run the guests.
Both machines must conform to their operating system requirements and restrictions, and both must
be able to provide the allocated resources to the guest. If the guest uses 2 GB of memory on one
machine, it must be able to use that amount on the other machine. Similarly, if the source machine
can provide a guest with four vCPUs, the target machine must also be able to provide them. To
modify the virtual devices or network on the target host, use the hpvmmodify command.
To enable migration, all resources used by the guest must be configured symmetrically on both the
source and target host. A symmetric configuration includes:
• A common local area network (LAN)
• Identical subnet and vswitch connectivity
• Common access for Storage Area Network (SAN) based storage
• Private, high-speed network connection (for Online VM Migration)
For guidelines about setting up storage for migrating virtual machines, see Section 12.3 (page 205).
If the HP Capacity Advisor is used on the virtual machine, collect utilization information before you
migrate the virtual machine. The Capacity Advisor cannot continue to collect the utilization
information for the virtual machine during the migration operation.
Figure 13 (page 196) illustrates moving a guest online from a source VSP to a target VSP.
Figure 13 Online VM Migration from Source to Target
-
Guest OS
app1 app2
SAN
Guest continues to operate
on source VSP while
migration begins
Guest continues operation
on target server after
transfer completes
Guest is briefly
suspended as final
resident memory
image transfers
Guest OS with unique:
Kernel Parameters
Patch levels
Layered software
Guest OS
app1 app2
Source VSP (Integrity VM and HP-UX)
Target VSP (Integrity VM and HP-UX)
12.1.1 Reasons for migrating an online VM
There are various reasons why you might want to migrate an online VM. Most can be summarized
into four categories:
• Vacating a VSP system
• Targeting a particular VSP
196 Migrating virtual machines and vPars