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Cluster Ready Services

Oracle clusterware, also known as Cluster Ready Services (CRS), manages Oracle cluster-related functions including membership, group services, global resource management, and databases. CRS is required for every Oracle 10g RAC instance and is only applicable to Oracle 10g.

CRS has the following major components:

• A cluster interconnect that allows for cluster communications.
• A private virtual IP address for cluster communications over the interconnect.
• A public virtual IP address for client connections.
• Shared storage accessible by each node that needs to run the application.