Getting ORA-15204 on full database restore

Last week I was testing our backups and got this error: ORA-15204: database version is incompatible with diskgroup DATA_EDT1. This surprised me because all of our databases and Oracle homes on this Exadata are at version 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 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=”″ – that fixed it and the restore/recovery worked fine.