HP StorageWorks Fabric OS 5.0.0 Fabric Watch User Guide (AA-RW1TA-TE, May 2005)

37Fabric OS 5.0.0 Fabric Watch user guide
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 fluctuates above the high threshold and buffer zone. Figure 6 shows an
Above event trigger with a buffer zone.When a buffer is used, the data value must be greater
than the sum of the high threshold and the buffer value (event 1 in Figure 6). When the data
value becomes less than the high threshold again, Fabric Watch triggers a second event
(event 2) to indicate that it has returned to normal operation.
Figure 6 Above event trigger with buffer zone
Below event trigger
The Below event trigger generates an event when a data value becomes less than the low
threshold boundary.
When a buffer is defined, the data value must be below the buffer value and the low
threshold.
Changed event trigger
Use the Changed event trigger for an element that requires “rate of change” monitoring.
When Fabric Watch detects a change in the counter value between two sample periods
(defined by the time base), it triggers an event regardless of high or low threshold settings.