Are you thinking of implementing Oracle RAC? You might want to think again….
Prior to making this decision I would strongly recommend that you read the following whitepaper - SQL Server vs. Oracle RAC white paper to find out if you do require RAC for your solution.
See how SQL Server can help implement your solutions at 1/5th of the cost (Note: retail pricing of SQL Server and Oracle RAC), and make it easy for your DBAs to implement and manage.