Where is Cluster Aware AIX cluster configuration data stored?

CAA uses a repository disk - a shared SAN or multipath disk visible to every node - as the authoritative store for cluster topology, node membership, and disk-based heartbeat information. Because all nodes access the same physical disk simultaneously, there is no single point of failure from network partitioning and no need for a designated master node to hold the configuration.

An NFS filesystem relies on a network service and a file server, which would introduce a single point of failure for cluster configuration access and is not the CAA storage model.

A shared system pool is a virtual resource concept in PowerVM related to processor and memory sharing between LPARs, not a storage mechanism for CAA cluster configuration data.

CAA does not designate a master node that holds a primary copy and replicates to peers; all nodes read and write directly to the same shared repository disk, avoiding master-election complexity and split-brain risk.