Formerly known as the PowerHA wiki below is a list of references I've put together over time and relocating it here.

Summary

IBM PowerHA SystemMirror (formerly known as HACMP – High Availability Cluster Multiprocessing) provides solutions that maintain high availability, while making the IT environment simpler and more flexibile to respond to changing needs. IBM PowerHA SystemMirror in brief:

IBM PowerHA SystemMirror editions in brief:

• PowerHA SystemMirror Standard Edition provides high availability in implementations where all cluster nodes can access the same disk storage subsystem.
• PowerHA SystemMirror Enterprise Edition provides high availability in implementations where cluster nodes are geographically dispersed.

For more information see the PowerHA overview

Latest News & Updates

PowerHA Support

• Fix Level Recommendation Tool
• Shawn’s PowerHA and AIX Version Compatibility Matrix 
• IBM’s PowerHA and AIX Version Compatibility Matrix
• HACMP Fix downloads via Fix Central (v6.1)
• PowerHA Fix Downloads (v7.2)
• Known Fixes Important for Migrations
• SMUI Install Script Broken with bad links to downloads
• Etherchannel Failure with CAA and LACP
• PowerHA vulnerability
• PowerHA lodash vulnerability

PowerHA Library

HA/DR article in Systems Magazine

Whitepapers

• PowerHA v7.1 quick config guide
• PowerHA with EMC V-Plex
• Edison Group Report on the value of deep integration of PowerHA 7.1 and AIX 
• Delete and recreate 7.1 cluster results in “1035-305” error

Base Level PowerHA Product Publications

• 7.2.x
• Pre-7.2

Redbook Publications

• PowerHA for AIX Cookbook (7.2.x)
• HA & DR Options for IBM Power Systems Redbook
• IBM VM Recovery Manager for Power Systems
• PowerHA v7.2.3 Updates
• PowerHA v7.2.1 Updates
• PowerHA v7.2 Updates
• PowerHA with Oracle and Spectrum Virtualize HyperSwap
• PowerHA Best Practices Redpaper
• PowerHA Best Practices and Migration Guide (from Veritas)
• Deploying PowerHA with HyperSwap
• IBM PowerHA SystemMirror v7.1.2 Enterprise Edition for AIX
• PowerHA for AIX Cookbook (5.5)
• Implementing HACMP 5.3 Cookbook
• HACMP 5.3 DLPAR and Virtualization Redpaper

PowerHA v7 Standard Edition Demos

• Using PowerHA 7.2.2 SMUI – Creating a Two-Node cluster
• Using PowerHA 7.2.2 SMUI – Using Zones
• Using PowerHA 7.2.2 SMUI – User and Role Management
• Using cl_ezupdate in v7.2.1.1 to perform non-disruptive upgrade
• Using cl_ezupdate in v7.2.1.1 to perform non-disruptive updates
• Installing PowerHA v7.2.1 SMUI (System Mirror User Interface)
• AIX Live Kernel update on a PowerHA v7.2 node
• PowerHA 7.2 rootvg failure detection demo
• PowerHA v7.2 Automatic Repository Replacement
• Service IP Distribution Policy of Firstalias and “Source” in 7.1.3 cluster 
• Creating and PowerHA 7.1.3 cluster HTML report 
• Defining a backup repository disk in PowerHA v7.1.2 cluster
• Creating San Heartbeat for PowerHA v7.1
• PowerHA Administration – Adding more space to an existing volume group
• PowerHA Administration – Adding a volume group into an active cluster
• User Defined Dynamic Node Priority Fallover Demo Highest
• User Defined Dynamic Node Priority Fallover – Lowest
• Using IBM Systems Director to Configure PowerHA v7.1.2 cluster
• Dynamically add a node into an active PowerHA cluster
• Delayed Fallback Timer
• Non-disruptive updates to PowerHA v7.1.2
• Dynamic Volume Expansion in an active PowerHA v7.1.3 cluster
• Cloning a PowerHA node from another

Migrating/Upgrading to PowerHA v7 Demos

• Non-Disruptive upgrade from PowerHA v7.1.3 to v7.2.1
• Snapshot migration from PowerHA v7.1.3 to v7.2.1
• Offline migration from PowerHA v7.1.3 to v7.2.1
• Rolling migration from PowerHA v7.1.3 to v7.2.1
• Snapshot migration from PowerHA v6.1 to v7.2
• Offline Migration from PowerHA 6.1 to v7.2
• Non-Disruptive Upgrading to PowerHA v7.2
• Rolling migration from PowerHA v6.1 to v7.2
• Offline Migration from PowerHA 6.1 to v7.1.3
• Rolling migration from PowerHA v6.1 to v7.1.3
• Snapshot migration from PowerHA v6.1 to v7.1.3
• Offline Migration from PowerHA SystemMirror for AIX v6.1 to v7.1.2
• Non-disruptively updating a 7.1.2 cluster
• Rolling Migration to PowerHA v7
• Snapshot Migration from PowerHA 7.1.0 to 7.1.1
• Migrating from CAAv0 to CAAv1 in PowerHAv7.1

PowerHA v7 Enterprise Edition Demos

• PowerHA w/GLVM Demo
• Fallover with XIV async replication
• Operator Managed Manual Site Fallover

PowerHA v6.1 Standard Edition Demos

• Two-node Configuration Assistant
• Cluster Test Tool
• Fallover demo w/SAP

PowerHA v6.1 Enterprise Edition Demos

• Site Fallover using San Volume Controller Global Mirror 
• Site Fallover using Hitachi TrueCopy

Misc Demos

• PowerHA 5.5 w/SAP and Oracle LPM demo