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

Fabric Watch concepts38
Figure shows events generated when the data value changes. Each arrow in the figure
indicates a generated event.
Figure 7 Changed threshold
Use Changed event triggers with discretion. They are most useful when a change in value is
expected to be rare. Monitoring a fabric element that is subject to frequent change generates
so many events that it can render it virtually useless. For example, this trigger type is
appropriate for FRU failures. It is not appropriate for temperature monitoring.
In-Between triggers
Fabric Watch event triggers are usually set to notify the user of a warning or failure condition,
but there is an exception. You can define the In-Between trigger to receive a notification of
fault recovery. For example, when measuring port performance, crossing the high threshold
triggers an Above threshold event, which displays a warning message. The threshold might
be crossed for a period so brief that is not a true cause for an alarm. An In-Between trigger
indicates that the port performance has returned to the acceptable range.
Use the In-Between trigger to:
• Verify a successful recovery from a faulty condition.
• Reset the counter value for the next event.
• Identify an element that is consistently operating under marginal condition.