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The new node must have the identical operating system and patch level as the existing nodes. When you physically add the new node to the cluster, make sure the node is connected to the same shared storage devices as the existing nodes and has private network connections to two independent switches for the cluster. Refer to the Veritas Cluster Server Installation Guide.
After installing SF Oracle RAC on the new node and starting VxVM, the new node can access the same shared storage devices (including coordinator disks). If the new node does not see the same disks as the existing nodes, the new node cannot join the cluster, as indicated by a CVM error on the console.