Oracle always recommends to keep the controlfile in multiple diskgroups.  For standalone database multiplexing controlfile is straight forward, But for RAC ,we need to follow below steps.

 

1. Check the controlfile location:

 

Currently there is only one controlfile under +DATA diskgroup. We will multiplex them by to REDOA and REDOB diskgroup.

2. Modify the control_files parameters with diskgroup names,

3. Start the database in nomount stage:

4. Check the control_file parameter:

5. Stop and start the database in open mode:

6. Check the controlfile from v$controlfile;

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