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After installing SF Oracle RAC, a VCS cluster attribute (HacliUserLevel) is set to give root the ability to run commands on remote systems by way of the cluster interconnect. CFS takes advantage of this mechanism to enable you to perform file system operations requiring the primary node be initiated on secondary nodes and carried out on the primary node transparently.
If you reset this attribute, be aware of which node is the primary for certain file system operations and perform those tasks from that node. Unlike a non-RAC environment, you cannot run a sequence of VxVM and VxFS commands, such as resizing a volume and a file system, on the same node unless it is both the CVM master and CFS primary node.