ORA-27038 on 12.1.0.2 RAC Upgrade

I am upgrading a 2-node Oracle RAC testbed from Oracle 11.2.0.4 to Oracle 12.1.0.2. This is a simple testbed and the database is virtually empty. I’m using the DBUA to perform the upgrade. Should be simple, right?

After the database is upgraded, the DBUA is trying to move the RAC configuration to the new home. Early on, I get a “file exists error”. I check the $ORACLE_BASE/cfgtoollogs/dbua/upgrade1 directory and in the PostUpgrade.log file, I get this curious error:

[oracle@nau-rac01 upgrade4]$ cat PostUpgrade.log

create spfile=’/u01/app/oracle/product/11.2.0.4/dbs/spfileresp1.ora’ FROM pfile=’/u01/app/oracle/product/12.1.0.2/dbs/initresp.ora’

*

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ERROR at line 1:

ORA-27038: created file already exists

Linux-x86_64 Error: 17: File exists

 

I’m not sure why 12.1.0.2 is trying to create a SPFILE in the old home for the upgrade. But for me, this is a simple fix. Remove file from this directory and re-run the upgrade. This isn’t an issue because this is an Oracle RAC database and the true SPFILE location is on shared disk, not in this unshared home, and is denoted in the OCR. Removing the file the DBUA was trying to create resolved my problem.