Why migrate to RAC

Just to get a taste of RAC I have installed 11gR1, 11gR2 RAC 2-3 times on VMware 2 virtualized environment, I am now ready for actual migrations to RAC but it is not going to be easy. None of databases in our Prod are RAC databases. All databases run on multiprocessor machines which are fairly powerful. Current setup provides some safety from server failure by maintaining a passive server in tandem though OS/hardware mirroring ( I am not quite sure how but oracle is not in picture) .
I want to convince my manager that we should make a move to RAC. What points can be brought up .
In my own opinion any application can benefit RAC if it is to support more users, more sessions (Scalability) . if more batchjobs can be run in parallel then servers can be loaded more heavily. We can use the current redundancy provided by passive servers by making them active nodes and taking benefit of their dormant capacity.
What other benefits are there ? The generic question can be what application will benefit from migration to RAC.
Regards,

Online transaction processing (OLTP) and Internet application environments are characterized by short transactions that cannot be further broken down and, therefore, no speedup can be achieved. However, by deploying greater amounts of resources, a larger volume of transactions can be supported without compromising the response.
Decision support systems (DSS) and parallel query options can attain speedup, as well as scaleup, because they essentially support large tasks without conflicting demands on resources. The parallel query capability within the Oracle database can also be leveraged to decrease overall processing time of long-running queries and to increase the number of such queries that can be run concurrently.- High Availability - because you have many servers ,upgrade Hardware you can upgrade on each node.
- Rolling Upgrade
- load balance
- scalability
- mange database service
etc
http://www.nyoug.org/Presentations/2006/September_NYC_Metro_Meeting/200609Zito_You%20Probably%20DO%20Need%20RAC.pdf
http://en.wikipedia.org/wiki/Oracle_RAC
Good Luck

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