srvctl convert database -db db_unique_name -dbtype RAC
If you are relocating the database you want to convert to Oracle RAC using online database relocation, or an online database relocation has failed, then you must either quit or complete the relocation before you run the
srvctl convert database command.
After you run this command, you must create server pools for each database service, in addition to the database server pool. The values for
SERVER_NAMES for the server pools used by the database services must be set to the node that you converted from an Oracle RAC One Node to an Oracle RAC node. You can use the CRSCTL utility or Oracle Enterprise Manager to create and configure the server pools.
Converting an administrator-managed Oracle RAC One Node database to an Oracle RAC database configures all database services so that the single-instance database is the preferred instance for that service. After you convert the database, you can add instances to your database by using the
srvctl add instance command.
Converting a policy-managed Oracle RAC One Node database to an Oracle RAC database sets all database services to UNIFORM cardinality. It also results in reusing the server pool in which the database currently runs. The conversion reconfigures the database to run on all nodes in the server pool. The command does not start any additional instances but running the
srvctl start database command starts the database on all nodes in the server pool.
"srvctl convert database" for more information about this command