HP StorageWorks 2/140 director product manager user guide - Page 97

Monitoring and Managing the Director When a port is logged in, moving the cursor over its bar graph displays a message with the attached port's WWN. If the port is an E_Port, the message reads, E_Port and if the port is not logged in, the message displays the port's current operational state (refer to Table 2-1). Port Statistics To choose and display more detailed performance information for a port, click the port's bar graph. The bar graph for that port highlights with a darker background, and the lower portion of the Performance View panel displays the statistics values for the port's number and the WWN decoding. The Statistics Values tables contain cumulative port statistics and error statistics for transmit and receive traffic, class 2 and class 3 statistics, operational statistics, and error categories. Click a category in the left side of the statistics area to display only statistics for that category or click All to display values for all categories. For a description of the Refresh and Clear buttons, refer to "Button Functions" on page 2-41. NOTE: There are not thresholds for these values. You may determine that a problem exists by the rate that the value changes. For example, BB_Credit starvation can occur if data is sent to a device faster than it can consume the frames. This can back up into ISLs causing degraded performance. Statistics Description The Statistics Values tables contain statistics in the following groups. To refresh tables with the latest data, click Refresh on the upper right portion of the Statistics Values panel or click the port's bar graph. Clear all counters for all users using Clear. Traffic Statistics with Receive and Transmit Values This section describes the types of statistics that display when you click a port's bar graph: • Link utilization %-There is a separate value for transmit and receive link utilization. The larger of these two values displays on the bar graph. The current link utilization for the port is expressed as a percentage. Each port can transmit or receive data at 200 megabytes (MB) per second. This statistic shows the percentage of the maximum link utilization currently being used. Link utilization is calculated over one-second intervals. The maximum link utilization is 100%. • 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. director product manager user guide 2-37