HP StorageWorks 4/64 Brocade Fabric Watch Administrator's Guide v6.2.0 (53-100 - Page 44
the high threshold of 2.
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4 Time bases Example1: Triggering an event 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 Example 2: Not triggering an event Figure 5 uses the same data to illustrate a case in which a threshold is exceeded without triggering an event. In this case, the calculated rate of change in the data value is always less than or equal to the high threshold of 2. At the tenth sample, the rate of change is one per minute. At the fourteenth, twenty-first, and twenty-fifth sample, the rate of change remains equal to the high threshold of 2. In this case, Fabric Watch does not trigger an event even though the absolute value of the counter reaches 4, which is well above the high threshold. 22 Fabric Watch Administrator's Guide 53-1001188-01