Many factors affect the performance of the server and clients, including operating systems, system hardware, network configurations, storage device types, and client file sizes and numbers. Interactions among these factors can make performance tuning complex.
You can find more performance-related information at the Tivoli® Storage Manager wiki. See https://www.ibm.com/developerworks/community/wikis/home/wiki/Tivoli Storage Manager/page/Performance and Testing.