Oracle backup fails with ORA-19565: BACKUP_TAPE_IO_SLAVES not enabled when duplexing to sequential devices.
When backing up to sbt_tape (NetVault), the initialization parameter BACKUP_TAPE_IO_SLAVES need to be set to TRUE. If not, then RMAN signals the following error:
ORA-19565: BACKUP_TAPE_IO_SLAVES not enabled when duplexing to sequential devices
Run the following SQL to set the parameter value to TRUE
SQL>alter system set backup_tape_io_slaves = true deferred
Note that the Oracle instance needs to be restarted for the change to take effect.
