IBM E16RMLL-I Implementation Guide - Page 535
THROUGHPUT thresholds, COLLOCATION
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Tip: If SELFTUNEbufpoolsize is set to YES, expire inventory processing will also trigger the buffer pool performance monitoring algorithm to check whether a performance improvement could be gained (based on previous server execution and available real memory). THROUGHPUT thresholds Use the THROUGHPUTTIMETHRESHOLD and THROUGHPUTDATATHRESHOLD to control how Tivoli Storage Manager handles slow performing client sessions. Slow performing sessions may pin your recovery log and result in slower overall server performance. These options allow you to specify thresholds that must be met by client sessions in order to be considered productive and avoid cancellation. The THROUGHPUTDATATHRESHOLD is specified in kilobytes per second, and specifies the throughput that a client session must reach to prevent being cancelled after the time threshold is reached. The THROUGHPUTTIMETHRESHOLD is specified in minutes, and is added to the media wait time, to determine the total client session time. It specifies the time threshold for a session after which it may be cancelled for low throughput. If the server detects that the client data transfer rate is below the specified threshold, the session is considered to be eligible for termination after the time threshold is reached. COLLOCATION The speed at which you can restore the files, among other parameters, also depends on how many tape drives are available on the server, and whether you are using collocation to keep file spaces assigned to as few volumes as possible. With tape capacities becoming larger and larger, collocation by groups of nodes is now supported. Groups of nodes can be defined, and the server can then collocate data based on these groups. Collocation by group can yield the following benefits: Reduce unused tape capacity by allowing more collocated data on individual tapes. Minimize mounts of target volumes. Minimize database scanning and reduce tape passes for sequential-to-sequential transfer. For newly defined storage pools, the default storage pool collocation setting is now group. Chapter 15. Performance considerations 505
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