IBM E16RMLL-I Implementation Guide - Page 528
Tivoli Storage Manager server
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Incremental backup is nearly always preferred over selective backup, because selective backup generates a new version every time, regardless of whether the specific file has changed or not. 15.2.4 Client configuration Using the powerful include and exclude options, you can specify the amount of files to be backed up to a very detailed level. Careful use of these options can reduce the daily amount of backup data significantly and thus improve both client and server performance. 15.2.5 LAN-free backup/restore Using LAN-free backups can unburden LAN traffic significantly, as well as reduce the overhead on the Tivoli Storage Manager server, since the data is directly transferred to tape. This feature is important, especially for clients whose backups are routed to tape directly (databases, for example). 15.3 Tivoli Storage Manager server In this section we discuss the most common tuning parameters for all Tivoli Storage Manager servers. 15.3.1 Server database and recovery log This section covers server options to influence the performance and behavior of the server database and the recovery log. BUFPOOLSIZE Cache storage is provided by the database buffer pool size, which allows frequently used database pages to remain cached in memory. This means faster access times and better performance, because the pages can be read and updated from memory instead of requiring I/O operations to external storage. The larger the database buffer pool, the more space there is to keep pages in memory. However, since the buffer pool is implemented in real memory, its size must be balanced against total memory requirements for the whole system and any other workloads. To measure the effectiveness of the database buffer pool, monitor the cache hit percentage. This number indicates how often a database page request could be satisfied from the cache as opposed to requiring disk access. An optimal setting for the database buffer pool is one in which the cache hit percentage is greater 498 IBM Tivoli Storage Manager Implementation Guide
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