RE: rman configuration

That's mostly correct, just backwards on one point - it's to sync the
catalog from the controlfile (the authoritative source), not the other
way around.  But you are correct that it's just a temp file not needed
for restore/recovery operations, so to the OP - no need to change it.
In fact, I don't think you can change it to tape.  Maybe you're
confusing the snapshot controlfile with controlfile autobackup?  They
are two completely different things and your controlfile autobackup goes
to two places:
 
1) On disk to $ORACLE_HOME/dbs (by default) whenver you make a change to
your database structure (add datafile, tablespace, logfile, etc.)
2) To the same channel type as an rman backup, i.e. if you run a
database or log backup to sbt_tape and have controlfile autobackup ON,
then it will automatically run a controlfile autobackup to sbt_tape
after the completion of the database/log backup.
 
Regards,
Brandon 

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