This parameter defines additional parameters that RMAN passes to an external backup library, that is,
backup_dev_type = rman_util.Syntax:
rman_parms = "<string>"Default: none
Ask the vendor of the external backup library if it requires you to set additional parameters.
rman_parms = "BLKSIZE=65536 ENV=(BACKUP_SERVER=HOSTNAME)"
See also:
RMAN Backup with an External Backup LibraryOracle documentation