Selected capacity planning information

IXGRPT1 flags the existence of events that affect the interpretation of system logger data for capacity planning. Some events apply to coupling facility based log streams only, while others apply to both coupling facility and dasd only log streams.

Coupling facility log stream only events include:

For every interval, IXGRPT1 displays the number of STRUCTURE FULL events that were detected for a coupling facility log stream. Frequent STRUCTURE FULL events can indicate a poorly sized coupling facility or that the applications writing to the coupling facility log stream have sporadic bursts of high activity. The installation should perform additional analysis.
For every interval, IXGRPT1 displays the number of STRUCTURE REBUILD events that occur. Frequent STRUCTURE REBUILD events indicate a need for further analysis.

Coupling facility and dasd only log stream events include:

For every interval, IXGRPT1 displays the number of bytes written to the coupling facility (SMF88SWB) and to the DASD log stream data set (SMF88LDB).
For every interval, IXGRPT1 displays the number of staging data set full and staging data set threshold hit conditions for the log stream.
For every interval, IXGRPT1 displays the number of DASD shift events that occur. Frequent DASD-shift events can indicate a poorly tuned system or a very high volume of system logger activity. The installation should perform additional analysis.
Note: A DASD-shift event occurs when system logger determines that a log stream must stop writing to one log data set and start writing to a different data set. A DASD-shift event generally occurs when a log data set becomes full.
For a given log stream, IXGRPT1 displays the number of systems in the sysplex which contribute to an SMF record during the interval. In some cases a system expected to contribute a record might not do so. The count of contributing systems therefore may be used as a signal for further analysis, or to exclude exception records from normal state capacity planning.