Understanding resource monitoring times

When you define your resource monitoring attributes, you must identify a monitor interval, period definition, and sample interval, where:

Monitor interval
The number of minutes during which data is to be collected and accumulated. At the end of an interval, the statistics counters are automatically reset.

Start of changeA monitor interval is associated with a CICSplex and applies to all CICS® system and CICS system groups comprising that CICSplex. To create or display the monitor intervals associated with the CICSplex, use the CICSplex definition view or the CPLEXDEF EUI view, as described in CICSPlex SM Administration.End of change

When a CICS system starts, it determines how much of the current interval has elapsed for its CICSplex and begins from there. Thus, the interval for a CICS system may be less than the defined interval. For example, if the monitor interval for a CICSplex is 60 minutes and a CICS system associated with that CICSplex starts at 09:15:00, the first monitor interval for that CICS system is 45 minutes. Subsequent intervals will be 60 minutes in length.

Period definition
The range of hours during which resource monitoring is to be active for a CICS system.

A time period definition can be associated with a monitor definition when you assign the monitor definition to a monitor group, as illustrated in Figure 54. If no time period definition is associated with the monitor group, resource monitoring is active as long as the CICS system using the monitor definitions in that monitor group is active.

When a monitor definition is not associated with a monitor group, no period definition is associated with the monitor definition. In this case, the monitor definition becomes active when you manually install it in a CICS system. It remains active as long as the CICS system is active or until you discard the definition. To display information about existing time period definitions or create new ones, use the Time period definition WUI view or PERIODEF EUI view, as described in CICSPlex SM Administration.

Sample interval
The number of seconds between the collection of sample data for a resource type; the data is reported in monitoring views as the current sample.

A sample interval is associated with a resource type via a monitor specification, as illustrated in Figure 54.

Note:
One full sample interval must elapse before information about the resources being monitored is included in a monitoring view. This ensures that enough time has elapsed for meaningful data to be collected. Depending on when a CICS system starts, more than a full interval may elapse.

Figure 55 identifies the monitor-related time periods and illustrates their relationship to each other. In this case, the period during which resource monitoring is to be active(the period definition), is between 09:00:00 and 12:00:00. Resource data is to be collected every 15 minutes (900 seconds) (the sample interval). During each monitor interval of 60 minutes, resource data is to be accumulated and reported as an average. After each 60 minute interval, the statistics counters containing the accumulated statistics are to be reset to zero.

Figure 55. Resource monitoring time periods
 The figure shows a time line illustrating the different monitoring time periods. See the description of this figure for an explanation.
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