HP StorageWorks 2/16V Brocade Fabric Watch Administrator's Guide - Supporting - Page 32

1 Configuring events 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. FIGURE 5 Example without an event EVENT SETTINGS 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 impacts event triggering. Fabric Watch monitors data values for one of the following conditions: • "Above event triggers," next • "Below event trigger" on page 17 • "Changed event trigger" on page 17 • "In-between event triggers" on page 18 For Fabric Watch to monitor these conditions, the alarm setting must be set to a nonzero value. Above event triggers Use the Above event trigger for an element that requires only high threshold monitoring. In the Above event trigger, Fabric Watch triggers an event immediately after the data value becomes greater than the high threshold. Define a buffer zone within the operational limit of an area to suppress multiple events when the counter value goes above the high threshold and fluctuates around it. The next event will not occur until the counter value falls below the buffer zone created by the high threshold. Figure 6 shows an Above event trigger with a buffer zone. The Above event trigger occurs when the counter crosses 16 Fabric Watch Administrator's Guide 53-0000438-01