Brocade Fabric Watch Administrator's Guide v6.1.0 (53-1000601-02, June 2008)

18 Fabric Watch Administrator’s Guide
53-1000601-02
Event Configuration
1
DRAFT: BROCADE CONFIDENTIAL
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.
Figure 7 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 event 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 event 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 event trigger indicates that the
port performance has returned to the acceptable range.
Use the In-Between event 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 conditions.