if i have a filover service and a parallel service that work together i think i create vcs cluster for failover service and a cvm cluster to parallel service.right?

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Re: parallel

Well a fai;over group provides HA to applications running on one system at any time while a parallel service group allows applications, like a shared disk group, CFS, Oracle RAC, Sybase etc, running on more then one system "simultaneously" at a time this is why the parallel name is called.   Both failover and parallel service groups can co-exist on the same cluster, so long as the service group dependencies are configured correctly.