The OCR contains information about the cluster node list, which instances are running on which nodes, and information about Oracle Clusterware resource profiles for applications that have been modified to be managed by Oracle Clusterware.
You can add an OCR location after an upgrade or after completing the Oracle RAC installation. If you already mirror the OCR, then you do not need to add an OCR location; Oracle Clusterware automatically manages two OCRs when you configure normal redundancy for the OCR. Oracle RAC environments do not support more than two OCRs, a primary OCR and a secondary OCR.
The voting disk records node membership information. A node must be able to access more than half of the voting disks at any time.
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