Prerequisites for upgrading PowerHA SystemMirror
You can upgrade to PowerHA® SystemMirror® Version 7.2.3 for AIX® by using rolling migration, snapshot conversion, or offline migration.
Before you upgrade to PowerHA SystemMirror, you must have a basic knowledge of the following information:
- Supported PowerHA SystemMirror versions for the upgrade operation. For more information see, Supported upgrade PowerHA SystemMirror versions.
- Minimum required technology level of the AIX operating system that is required to upgrade to the desired PowerHA SystemMirror version. For more information, see AIX operating system requirements.
- PowerHA SystemMirror Version 7.2.3 supports a non-disruptive upgrade. For more information, see the Performing a non-disruptive upgrade from PowerHA SystemMirror 7.2.0 to PowerHA SystemMirror 7.2.1, or later topic.
Notes:
- If you are migrating to PowerHA SystemMirror Version 7.2.4, and later, you might want to install the supporting software for PowerHA SystemMirror GUI server. For instructions, see Installing PowerHA SystemMirror GUI topic.
- Before you migrate from PowerHA SystemMirror Version 7.2.1 SP2, or later, to PowerHA SystemMirror Version 7.2.2 by using
installp or the SMIT interface, you must run the following command from the
command line:
export OLD_SYSNAME=phauiagent
Host name requirements
Review the following information about host name requirements when you upgrade
to PowerHA SystemMirror Version 7.2.3 for AIX:
- The host name, the Cluster Aware AIX (CAA) node name, and the name in the COMMUNICATION_PATH field of the HACMPnode Object Data Manager (ODM), must be the same.
- The host name and the PowerHA SystemMirror node name can be different.
- The host name can be changed after the cluster is deployed in an environment.
- The following statements do not apply if the host name is configured by using the
hostname command:
- The host name cannot be a service address.
- The host name cannot be an IP address that is on a network that is defined as private in PowerHA SystemMirror.
Split and merge policy requirements
If the cluster already has split and merge policies that are configured, then these policies are
converted during the upgrade process to the policies that are supported in PowerHA SystemMirror Version 7.2.3 for AIX. The following table
displays the split and merge policy combinations before you upgrade and after you upgrade to
PowerHA SystemMirror Version 7.2.3 for AIX:
| Before migration: split and merge policies | After migration: split and merge policies |
|---|---|
| None - Majority | None - Majority |
| None - Priority | None - Majority |
| None - Manual | None - Majority |
| Tie breaker - Tie breaker | Tie breaker - Tie breaker |
| Tie breaker - Priority | Tie breaker - Tie breaker |