Fabric Watch Administrator's Guide v7.0.0 (53-1002153-01, April 2011)

18 Fabric Watch Administrator’s Guide
53-1002153-01
Threshold triggers
2
Figure 3 shows a sample graph of data obtained by Fabric Watch (the type of data is irrelevant to
the example). A high threshold of 2 is specified to trigger an event. A time base of minute is
defined. An event occurs only if the rate of change in the specific interval (one minute in this
example) is across the threshold boundary. It should be either higher than the high threshold limit
or lower than the low threshold limit.
As illustrated on the tenth sample, the counter value changes from 0 to 1; hence calculated rate of
change is 1 per minute. At the thirteenth sample, the rate of change is 2 per minute. The rate of
change must be at least 3 per minute to exceed the event-triggering requirement of 2, which is met
on the eighteenth sample.
FIGURE 3 Event trigger
Threshold triggers
This section describes how Fabric Watch compares a fabric element’s data value against a
threshold value to determine whether or not to trigger an event. It describes how a specified buffer
zone affects event triggering.
For Fabric Watch to monitor data values for one of the following conditions, the alarm setting must
be set to a nonzero value.