## Hardware 

Support is available only for POWER5 processor-based technologies and later. (This support directly depends on the AIX base version. AIX 7.2 requires an IBM POWER7fi processor-based system or later). 

## 4.1.2 PowerHA SystemMirror V7.2.3 requirements 

Here are the software and hardware requirements that must be met before migrating to PowerHA SystemMirror V7.2.3. 

## Software requirements 

The software requirements are as follows: 

GLYPH<SM590000> IBM AIX 7.1 with Technology Level 4 with Service Pack 2 or later 

GLYPH<SM590000> IBM AIX 7.1 with Technology Level 5 or later 

GLYPH<SM590000> IBM AIX 7.2 with Service Pack 2 or later 

GLYPH<SM590000> IBM AIX 7.2 with Technology Level 1, Service Pack 1 or later 

GLYPH<SM590000> IBM AIX 7.2 with Technology Level 2 or later 

## Hardware 

This support directly depends on the AIX base version. For example, AIX 7.2 requires a POWER7 processor-based system or later. 

Note:  Check adapter support for the storage area network (SAN) heartbeat during the planning stage. 

## 4.1.3 Deprecated features 

Starting with PowerHA V7.2.0, the IBM Systems Director plug-in is no longer supported or available. However, PowerHA V7.2.1 does provide a new GUI that is referred to as the PowerHA SystemMirror User Interface (SMUI). For more information about this feature, see 5.1, “SMUI new features” on page 128. 

## 4.1.4 Migration options 

There are four methods of performing a migration of a PowerHA cluster. Each of them is briefly described, and in more detail for the corresponding migration scenarios that are included in this chapter. 

Offline A migration method where PowerHA is brought offline on all nodes before performing the software upgrade. During this time, the cluster resource groups (RGs) are not available. 

Rolling A migration method from one PowerHA version to another during which cluster services are stopped one node at a time. That node is upgraded and reintegrated into the cluster before the next node is upgraded. It requires little downtime, mostly for moving the RGs between nodes so that each node can be upgraded. 

