Dell Brocade 300 Fabric Watch Administrator's Guide v7.1.0 - Page 37
Fabric Watch alarm behavior
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Fabric Watch alarm behavior 2 Figure 4 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 4 Event trigger Fabric Watch alarm behavior Fabric Watch alarm behavior depends on the threshold states associated with the Above, Below and Changed thresholds. Threshold states can be INFORMATIVE, IN_RANGE, and OUT_OF_RANGE. Notifications are generated only for the following transitions: • IN_RANGE to OUT_OF_RANGE • OUT_OF_RANGE to IN_RANGE No alarm is generated for INFORMATIVE to IN_RANGE (or IN_RANGE to INFORMATIVE). Fabric Watch Administrator's Guide 17 53-1002752-01