RMAN: Baking up to "SBT_TAPE" : how to do it fast !!!??

  Question:

When backing up database to “SBT_TAPE”, tape library which has just one tape drive, which parameters in RMAN setup can speed up the backup most?

RMAN reports errors when put more then PARALLELISAM = 1 and when ALLOCATE more then one channel ...

 

 

Environment:

 

This is configuration of my RMAN:

 

RMAN configuration parameters for database with db_unique_name TST11 are:

CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 1 DAYS;

CONFIGURE BACKUP OPTIMIZATION ON;

CONFIGURE DEFAULT DEVICE TYPE TO 'SBT_TAPE';

CONFIGURE CONTROLFILE AUTOBACKUP ON;

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/RMAN_BACKUP/flash_recovery_area/TST11/cf_%F';