SMF Help

SMF

SMF uses the system logger to create one or more logstreams for SMF records. The amount of storage needed to support SMF logstream is dependent on the rate at which records are generated in the sysplex. This boils down to how many records you want to keep in the structure at any point in time.

Writes per Second

The number of log blocks written to the log stream per second from all systems. If you are migrating from data set recording to logstream recording then you should run IFASMFDP against the SMF data set to obtain data for a fixed amount of time. The IFASMFDP report will tell you how many records of what type are in that interval. Then for each logstream, determine the total number of writes for all SMF records associated with that logstream and divide by the duration of the interval. If you are already using logstreams but need to tune your structure, you can use the IFASMFDL program and follow the same procedure against a group of logstreams that map to a structure.

Maximum Buffer Size

Specifies the maximum size in bytes of log blocks written to all log streams, corresponding to the MAXBUFSIZE parameter of the Logger policy.  The Maximum Buffer Size must be between 33024 and 65532.