Last week I was testing our backups and got this error: ORA-15204: database version 11.2.0.0.0 is incompatible with diskgroup DATA_EDT1. This surprised me because all of our databases and Oracle homes on this Exadata are at version 11.2.0.3. I was testing full restore/recovery without a control file or an spfile. The first step was to restore spfile and controlfile from autobackup to their ASM locations.
I queried V$ASM_DISKGROUP in ASM and saw that all of our diskgroups have compatibility set to 11.2.0.2.0. In order to start RMAN restore I had created a minimal pfile. I didn’t bother setting the compatible parameter. I edited the pfile and set compatible=”11.2.0.3.0″ – that fixed it and the restore/recovery worked fine.