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). Here are the software and hardware requirements that must be met before migrating to  PowerHA SystemMirror V7.2.3. The software requirements are as follows: 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. 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. 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. Chapter 4. Migration  89 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. 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  4.1.2 PowerHA SystemMirror V7.2.3 requirements Software requirements Hardware 4.1.3 Deprecated features 4.1.4 Migration options