HP StorageWorks 1606 Brocade Fabric Watch Administrator's Guide v6.3.0 (53-100 - Page 45

Time bases, Time base set to none, Time base set to other than none

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Time bases 4 Time bases Time bases are time periods within Fabric Watch. This configurable field affects the comparison of sensor-based data with user-defined threshold values. Time base set 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 3 shows a high limit of 65 degrees Celsius placed on a counter measuring temperature. During each sample period, Fabric Watch measures the temperature and compares it to the high threshold. If the measured temperature exceeds the high threshold, it triggers an event. FIGURE 3 Time base set to none Time base set to other than none If you specify a time base value other than none (seconds, minute, hour, or day), Fabric Watch does not use the current data value. Instead, it calculates the difference between the current data value and the data value as it existed one time base ago. It compares this difference to the threshold boundary limit. For example, if you specify the time base minute, Fabric Watch calculates the counter value difference between two samples a minute apart. It then compares the difference (current data value - data value one minute ago) against the preset threshold boundary. When you set a time base to a value other than none, there are two main points to remember when configuring events: • Fabric Watch triggers an event only if the difference in the data value exceeds the preset threshold boundary limit. • Even if the current data value exceeds the threshold, Fabric Watch does not trigger an event if the rate of change is below the threshold limit. The following examples illustrate each point. Fabric Watch Administrator's Guide 21 53-1001342-01

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Fabric Watch Administrator’s Guide
21
53-1001342-01
Time bases
4
Time bases
Time bases are time periods within Fabric Watch. This configurable field affects the comparison of
sensor-based data with user-defined threshold values.
Time base set 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 3
shows a high limit of 65 degrees Celsius placed on a counter measuring temperature.
During each sample period, Fabric Watch measures the temperature and compares it to the high
threshold. If the measured temperature exceeds the high threshold, it triggers an event.
FIGURE 3
Time base set to none
Time base set to other than none
If you specify a time base value other than
none
(
seconds
,
minute
,
hour
, or
day
), Fabric Watch does
not use the current data value. Instead, it calculates the difference between the current data value
and the data value as it existed one time base ago. It compares this difference to the threshold
boundary limit.
For example, if you specify the time base
minute
, Fabric Watch calculates the counter value
difference between two samples a minute apart. It then compares the difference (current data
value – data value one minute ago) against the preset threshold boundary.
When you set a time base to a value other than
none
, there are two main points to remember when
configuring events:
•
Fabric Watch triggers an event only if the difference in the data value exceeds the preset
threshold boundary limit.
•
Even if the current data value exceeds the threshold, Fabric Watch does not trigger an
event if the rate of change is below the threshold limit.
The following examples illustrate each point.