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When you physically add the new system to the cluster, it must have private network connections to two independent switches used by the cluster and be connected to the same shared storage devices as the existing nodes. Refer to the Veritas Cluster Server Installation Guide.
After installing Storage Foundation 5.0 for Oracle RAC on the new system and starting VxVM, the new system can access the same shared storage devices. It is important that the shared storage devices, including coordinator disks, are exactly the same among all nodes. If the new node does not see the same disks as the existing nodes, it will be unable to join the cluster.