Setting up RAC requires a shared disk architecture. Most of the documentation provided by Oracle provides a good sequence of steps to be followed to set up RAC and then to set up TAF (Transparent Application Failover). One of the issues that most first time implementers of RAC face is that the RAC instance does not start in spite of all the settings being correct.
This issue is not due to incorrect configuration of the RAC, but can usually be traced to missing settings in the shared disk mount point. One of the most common errors in NFS based shared systems is that not all the parameters have been correctly specified when the mount point is created. The NFS mount point must have the following parameters in a RAC environment:
Ensure that these settings are in place for a successful RAC implementation.