Review these topics to understand the cluster configuration options available in Oracle Grid Infrastructure 12c Release 2.
About Oracle Standalone Clusters
An Oracle Standalone Cluster hosts all Oracle Grid Infrastructure services and Oracle ASM locally and requires direct access to shared storage.
About Oracle Member Clusters
Oracle Member Clusters use centralized services from the Oracle Domain Services Cluster and can host databases or applications.
About Oracle Extended Clusters
An Oracle Extended Cluster consists of nodes that are located in multiple locations called sites.