EMC Connectrix ED-64M, Руководство пользователя

Страница: 119 / 476

4
Using the Performance View
4-33
Monitoring and Managing the Director
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.
Click a category in the left frame of the statistics area to display only
statistics for that category, or click All to display values for all
categories.
There are no thresholds for these values. You can determine that a
problem exists by the rate that the value changes. BB_Credit
starvation can occur if data is sent to a device faster than the device
can process the frames. Such a suituation can back up into ISLs,
degrading performance.
Refresh/Clear 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 Port Statistics window. The user can select options to clear
statistics on a selected port only or all ports on the product.
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.