Oracle Real Application Clusters use Oracle Clusterware as the infrastructure that puts together multiple nodes that then operate as a single server. Oracle Clusterware is a cluster management solution that is integrated with Oracle Database. In an Oracle RAC environment, Oracle Clusterware monitors all Oracle components (such as instances and listeners). If a failure occurs, Oracle Clusterware automatically attempts to restart the failed component and also redirects operations to a surviving component.
Oracle Clusterware includes two important components—the voting disk and the OCR. The voting disk is a file that manages information about node membership, and the OCR is a file that manages cluster and Oracle RAC database configuration information.
The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. If you select the option for normal redundant copies during the installation process, then Oracle Clusterware...