I was going to use a manual way to rename the Standby datafiles: Shutdown, mv Unix command and so on.NO No,
SAP tools and I don't know why OMF is configuredEven if the OMF is configured on Primary database, you should be able to change it on Standby database.
As you can see I have datafiles with different name and directory path in Primary and Standby instances so I'm afraid a possible switchover or failover does not work fine.And what docs are saying :
This is the reason why I want to disable OMF in both instances and rename the OMF's datafiles in my Standby instance.
Oracle recommends that when you set up Oracle Automatic Storage Management (ASM) and Oracle Managed Files (OMF) in a Data Guard configuration, set it up symmetrically on the primary and standby database. That is, if any database in the Data Guard configuration uses ASM, OMF, or both, then every database in the configuration should use ASM, OMF, or both, respectively. See the scenario in Section 13.5 for more information.http://docs.oracle.com/cd/B28359_01/server.111/b28294/standby.htm