getting rid of copies of archivelogs

I have set up a database in archivelog mode with
backup as COMPRESSED BACKUPSET  archivelog all not backed up delete all input 
format '/d123/backup/arch_%d_%u_%s';
among my rman  script commands.

Now /d123/ is filling up.  I have tried all sorts of rman> delete obsolete  etc 
  without result.   Finally, I wonder, are these copied logs no longer part of 
rman?  Is it sufficient to just delete them from the file system?  Or is there 
an RMAN command that I haven't tried.

Thanks in advance for your assistance,

Claudia Zeiler
Database Administrator
EC|Wise

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