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user7107816 wrote:??? That depends. Does each database require high availability? Your question seems to indicate a lack of understanding of what RAC provides and how it achieves that goal... High Availability.
On the shared SAN drive - there will be as many as 6 11gR2 databases. For 2 node RAC instance servers - how many instance servers would work fine - are two separate servers needed for each database?
RAC can also be used to provide additional horsepower - on the fly. I have added a new node - start to finish in < 2hrs. (new hardware+install/configure OS+addnode to RAC and have it online and operational.) No other database solution offers this flexability.