fine tuning databuffers

https://support.symantec.com/en_US/article.TECH18422.html

NUMBER_DATA_BUFFERS: This media server settings affects the number of data buffers used by NetBackup to buffer data prior to sending it to the attached storage unit (tape or disk). The default value is 16.
· SIZE_DATA_BUFFERS: This media server setting affects the size of each data buffer and thus the size of the I/O bock sent to the storage device. The default value is 65536.

<install_path>\NetBackup\db\config