Hitachi

JP1 Version 12 JP1/Integrated Management 2 - Manager Overview and System Design Guide


4.5.4 When the suppression of monitoring of a large number of events starts

For the suppression of monitoring of a large number of events, JP1/IM - Manager, after it started, suppresses the large number of events acquired from the event service by using the repeated-event monitoring suppression function. JP1/IM - Manager determines that events have occurred in large numbers when the conditions below are all met, and then starts the suppression of monitoring of the large number of events by using the repeated-event monitoring suppression function.

JP1/IM - Manager determines whether to start suppressing the monitoring of a large number of events when it receives, from the event service, an event that meets the event conditions in a repeated event condition.

JP1/IM - Manager determines whether to start suppressing the monitoring of a large number of events according to each repeated event condition.

You can set the threshold for determining whether a large number of events have occurred by specifying the occurrence monitoring period and the number of occurring events. Specify the threshold (occurrence monitoring period and the number of occurring events) on the Options page of the Repeated Event Condition Settings window.

The following describes when the events that meet the event conditions in repeated event condition α are determined to be targets of monitoring suppression. Assume that the occurrence monitoring period is 2 seconds and the number of occurring events is 5.

First, assume that a large number of events that meet the repeated event condition α have occurred as shown in the following figure.

Figure 4‒57: Occurrence of repeated event (1)

[Figure]

Whether an event that meets the event conditions in a repeated event condition occurred within the occurrence monitoring period is determined by the arrival time (B.ARRIVEDTIME) of the event. When the condition described below is satisfied by two events that meet the event conditions in a repeated event condition, the events are determined to have occurred within the occurrence monitoring period.

Among the events that have occurred as shown in Figure 4-57, event D is the latest event that meets the event conditions in repeated event condition α. The arrival time of event D is 3 seconds. The occurrence monitoring period is 2 seconds. Therefore, the events that meet the event conditions in repeated event condition α and for which the arrival time is in the range specified below are treated as the repeated events that have occurred within the occurrence monitoring period.

The following figure shows a graph of the number of events per occurrence monitoring period calculated as described above.

Figure 4‒58: Graph of the number of events per occurrence monitoring period (1)

[Figure]

As shown in Figure 4-58 Graph of the number of events per occurrence monitoring period (1), events B to D within the occurrence monitoring period (from second 1 to second 3) are treated as the repeated events that have occurred within the occurrence monitoring period. Therefore, the number of events per occurrence monitoring period is 3 at the time of event D.

At this point, the system is not in the status in which a large number of events have occurred because the number of events per occurrence monitoring period is less than the threshold.

Assume that the events that meet the event conditions in repeated event condition α have occurred as shown in the following figure after events had occurred as shown in Figure 4-57 Occurrence of repeated event (1).

Figure 4‒59: Occurrence of repeated events (2)

[Figure]

Here, event Q is the latest event that meets the event conditions in repeated event condition α. Events are treated in a similar way to the above case. Seven events, events K to Q, within the occurrence monitoring period (from second 6.1 to second 8.1) shown in Figure 4-60 are treated as the repeated events that have occurred within the occurrence monitoring period with reference to event Q.

The following figure shows a graph of the number of events per occurrence monitoring period obtained after all events are checked in a similar way.

Figure 4‒60: Graph of the number of events per occurrence monitoring period (2)

[Figure]

Focus attention on event H in Figure 4-60. Because five events, D to H, have occurred during 2 seconds (occurrence monitoring period) from second 3 to second 5, the number of events per occurrence monitoring period reaches the threshold at the time of event H. Accordingly, the system enters the status in which a large number of events have occurred, and the suppression of monitoring of a large number of events starts with event H.

Figure 4‒61: When monitoring of repeated events are suppressed

[Figure]

In the suppression period (second 5 and after) shown in the above figure, monitoring of the events occurring in large numbers are suppressed because JP1/IM - Manager determines that a large number of events have occurred. Monitoring of the events after event H is suppressed until the number of relevant events occurring is kept lower than the threshold for a specified period (end monitoring period).

As a larger number of occurring events is specified as a threshold value, a larger number of JP1 events are displayed in the event list of the Event Console window. For example, when 200 is specified as the number of occurring events, 200 repeated events are displayed in the event list of the Event Console window before monitoring suppression starts.

For the information that is displayed by JP1/IM - View when the suppression of monitoring of a large number of events, see 4.4.6 Event list display during the suppression of repeated-event display.