dd_flags 

Defines the dd options required for writing to tape.

This parameter is required if you are working with raw devices. In order to access raw devices, the ddcommand is used. See Raw Devices with BRBACKUP and BRRESTORE.

Syntax: dd_flags = <flags>

Default: "obs=16k"

If you define the default value, the data is written to tape in blocks of 16 KB, but you can also use a higher value, for example 64 KB.