HA for PostgreSQL enables the Oracle Solaris Cluster software to manage PostgreSQL by providing components to perform the orderly startup, shutdown, and fault monitoring of PostgreSQL.
You can configure HA for PostgreSQL as a failover service. You cannot configure HA for PostgreSQL as a multiple-masters service or as a scalable service.
When a PostgreSQL database cluster is managed by the HA for PostgreSQL data service, the PostgreSQL instance becomes a failover PostgreSQL resource across the Oracle Solaris Cluster nodes. The failover is managed by the HA for PostgreSQL data service, which runs within the global zone, zone clusters, and HA for Solaris Zones.
For conceptual information about failover data services, multiple-masters data services, and scalable data services, see Oracle Solaris Cluster 4.3 Concepts Guide.