Adding a RAC Database and Instance Using srvctl

For 11gR2. 

Command help can be generated as follows:

$ srvctl add database -h

and...

$ srvctl add instance -h

Add the database first

$ srvctl add database -d RAC -n rac01 -o $ORACLE_HOME

Now add the instances...

$ srvctl add instance -d RAC -i RAC1 -n rac01
$ srvctl add instance -d RAC -i RAC2 -n rac02