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When you say cluster the hardware...what exactly does that mean? What hardware?
When using RAC on AIX with ASM, CRS will manage all of your resources. HACMP is not required and even if you did install it, then would it manage?
CRS will manage your scan, scan vip, vip and the storage will be shared on ASM. So the question remains as to what will HACMP manage, if you wish to install it?
AIX: Top Things to DO NOW to Stabilize 11gR2 GI/RAC Cluster [ID 1427855.1]
RAC and Oracle Clusterware Best Practices and Starter Kit (AIX) [ID 811293.1]
If not using HACMP then HACMP filesets must not be installed.
you really do not want 2 cluster managers in a RAC environment. Some IBMers think they need HACMP - they really do not. I have attempted to use that environment at the insistance of the IBM/AIX admins. It was a disaster that was corrected by removing HACMP and using only the Oracle GI with ASM shared storage.