Amount of shared memory required by NetBackup
You can use this formula to calculate the amount of shared memory that NetBackup requires:
For tape:
Shared memory required = (number_data_buffers * size_data_buffers) * number_tape_drives * max_multiplexing_setting
For disk:
Shared memory required = (number_data_buffers * size_data_buffers)
For example, assume that the number of shared data buffers is 16, and the size of the shared data buffers is 64 kilobytes. Also assume two tape drives, and a maximum multiplexing setting of four. Following the formula, NetBackup requires 8 MB of shared memory:
(16 * 65536) * 2 * 4 = 8 MB
Be careful when changing these settings.