About shared memory (number and size of data buffers)
The NetBackup media server uses shared memory to buffer data between the network and the tape drive or disk drive. (Or it buffers data between the disk and tape if the NetBackup media server and client are the same system.) The number and size of these shared data buffers can be configured on the NetBackup media server.
The number and size of the tape and disk buffers may be changed so that NetBackup optimizes its use of shared memory. A different buffer size may result in better throughput for high-performance tape drives. These changes may also improve throughput for other types of drives.
Buffer settings are for media servers only and should not be used on a pure primary server or client.
Note:
Restores use the same buffer size that was used to back up the images being restored.