HP StorageWorks Fabric OS 5.X Fabric Watch Administrator Guide (AA-RVJ0B-TE, September 2005)

Fabric OS 5.x Fabric Watch administrator guide 21
Figure shows an example in which each time a signal crosses the high limit, an event occurs. The blue
arrows indicate the area where 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
Figure shows how to limit the number of event notifications using a buffer. When you specify a buffer,
events cannot occur both above the high threshold and below the low threshold. Event notification occurs
only where the arrow indicates. The event criteria is continued to be met until the data sensed falls below
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.
Figure shows a high limit of 65 degrees Celsius placed on a counter measuring temperature. During each
sample period, Fabric Watch measures the temperature is measured and compares it against the high
threshold. If the measured temperature exceeds the high threshold, it triggers an event.
Figure 3 Time base set to none