Fabric Watch Administrator's Guide v6.4.0 (53-1001770-01, June 2010)

15
Chapter
2
Fabric Watch Thresholds
In this chapter
•Threshold values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
•Time bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
•Threshold triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Threshold values
Threshold values are of the following types:
• High and low thresholds
• Buffer values
High and low thresholds
High and low threshold values are the values at which potential problems might occur. For
example, in configuring a temperature threshold, you can select the temperatures at which a
potential problem can occur because of overheating or freezing.
You can compare high and low thresholds with a data value. The units of measurement are the
same as that of the associated data.
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.
You can use buffer values to reduce the occurrence of events resulting from 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.