as a DBA, you can't decide about the app compatibility with RAC as you don't know all about the app functionality. The application vendor should be able to confirm it.
What are the things to be tested and what are the metrices to be checked to certify an application on RAC Setup.
What are the things to be testedFirst of all you should identify the Oracle Database features which have limitations into RAC environments (like DBMS_PIPE, DBMS_ALERT, global contexts and etc.).