HP StorageWorks 2/16V Brocade Fabric Watch Administrator's Guide - Supporting - Page 29

Configuring events 1 Buffer values Figure 1 shows an example in which each time a signal crosses the high limit, an event occurs. The arrows indicate the points at which the event criteria is met. In this case, there is a great deal of fluctuation. Even when the monitor is set to triggered, a number of messages are sent. FIGURE 1 Threshold monitoring You can use buffer values to reduce the occurrence of events due to data fluctuation. When you assign a buffer value, it is used to create a zone below the high threshold and above the low threshold. When values cross above the high threshold or below the low threshold, an event occurs. Figure 2 shows how to limit the number of event notifications using a buffer. When you specify a buffer, events cannot occur below the high threshold and above the low threshold. Event notification occurs only where the arrows indicate. The event criteria is continued to be met until the data sensed falls below the low threshold value or above the high threshold value. FIGURE 2 A buffered data region TIME BASES Time bases are time periods within Fabric Watch. This configurable field impacts the comparison of sensor-based data with user-defined threshold values. Setting time base to none If you set a time base to none, Fabric Watch compares a data value against a threshold boundary level. When the absolute value of the measuring counter exceeds the threshold boundary, an event is triggered. Fabric Watch Administrator's Guide 13 53-0000438-01