4
Using the Performance View
4-27
Monitoring and Managing the Switch
Port Statistics
To select and display more detailed performance information for a
port, click the port’s bar graph. A darker background highlights the
bar graph for that port, and the lower portion of the Performance
view displays the statistics values for the port. The Statistics Values
tables contain cumulative port statistics and error statistics.
The two buttons located at the right end of the title bar on the
Statistics Values table are:
◆ Refresh — Updates the data in the statistics tables and enables
you to compare values at any given time. Note that you can also
refresh data by clicking the port’s bar graph.
◆ Clear — Clears all counters to zero. Selecting this button displays
a Clear Request Confirmation window. Confirming the request
clears the statistics in the hardware at the physical port. Note that
this also clears counters for other Product Manager users.
An entry identifying when the statistics were cleared and by
whom is saved in the Audit Log.
As a general rule, you should clear all counts after the system is
stabilized. When looking at the Performance view, keep track of
the approximate time interval when errors accumulate, to judge
the presence and severity of a problem. Also, recognize that there
is a link recovery hierarchy implemented in Fibre Channel to
handle some level of expected anomalies. In general, be
concerned only with error counts that increment very quickly.
Traffic Statistics The Traffic Statistics table show two sets of values: Receive and
Tr an s mit. The bar graphs displays the larger of the two values:
◆ Link utilization % —The percentage of the maximum link
utilization (100%) currently being used. Link utilization is
calculated over one-second intervals. (Each port can transmit or
receive data at 100 MB/s.)
◆ Frames — The number of frames that the port has received or
transmitted.
◆ Four byte words — The number of words that the port has
received or transmitted.
◆ Offline sequences — The number of offline sequence that the
port has received or transmitted.
◆ Link resets — The number of link reset protocols that the port has
received or transmitted from or to the attached port.
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