HP XP Array Manager Software - Manual (Page 68)

• Peak: Indicates the peak I/O rate of the ports for the specified period. This value is shown in the
list when you select the Subsystem folder in the tree.
If you select a port in the list, click the Draw button, and select the Detail check box, the detailed
graph of the port I/O rate is drawn. The Peak value means the top of the Max. line in this graph.
• Max.: Indicates the maximum I/O rate for the specified period. This value is shown in the list
when you select a port icon or host group icon in the tree.
• Response Time: This column indicates the time for replying from the port or host bus adapter when
I/O accesses are made from the host to them. The unit is milliseconds. The average response
time in the period specified at Monitoring Term is displayed.
• Attribute: Indicates the priority of each port. Prio. indicates a prioritized port. Non-Prio. indicates
a non-prioritized port.
Viewing Transfer Rates for Ports
Performance Monitor monitors ports on the storage system and measures transfer rates (that is, the
size of data transferred in one second).
To view transfer rates:
1. Ensure that the Auto LUN window is displayed.
2. Select the Port-LUN tab ( Figure 12 on page 39).
The tree displays a Subsystem folder.
3. Select the Subsystem folder.
The Target folder, and the Initiator/External folder are displayed.
4. Select MB/s from the drop-down list on the right side of the window.
5. In Monitoring Term, do one of the following:
• To view the transfer rate in real time, you must select the Real Time option, specify the number
of recent collections of statistics which should be displayed in the graph, and then click Apply.
• To view transfer rates for a certain period of time in the last 24 hours, you must select the From
option, change the date and time in the From and To boxes, and then click Apply. Use the
arrow button and the sliders when you change the date and time in the From and To boxes.
For details on the Real Time option and the From option, see
“ Viewing Port Workload Statistics ” on page 41.
6. In the tree, select the Target folder, or the Initiator/External folder.
The list on the right displays transfer rates for the ports on the storage system. If you click the
Target folder, the tree displays a list of ports on the storage system. If you click a port icon (for
example,
and ), the host groups ( ) corresponding to that port appear.
Tips:
• If you select a port (for example, and ) in the tree, the list displays transfer rates for all
the host bus adapters connected to the selected port ( Figure 33 on page 69).
• If you select a host group ( ) in the tree, the list displays transfer rates for host bus adapters
in the host group ( Figure 33 on page 69). Note: You cannot view information about host bus
adapters if the host group is not registered in LUN Manager.
7. To display a graph to find out how the transfer rate has been changed, take the following steps;
a. In the list, select one or more ports or host bus adapters (WWNs).
b. Select the Draw button.
Caution: If the graph does not display changes in the transfer rate (for example, if the line
in the graph runs vertically), it is recommended that you change the value in the Chart Y
Axis Rate drop-down list. For example, if the largest value in the list is 200 and the value in
Chart Y Axis Rate is 100, you should select a value larger than 200 from Chart Y Axis Rate.
68 Performance Monitor Operations