When you click Go, Performance Manager and then Performance Management on the menu bar of the Storage Navigator main window, Performance Monitor starts and the Performance Management window is active. The Performance Management window includes the Port-LUN tab, which lets you view statistics about I/O rates, transfer rates, and average response time at storage system ports, host groups, LU paths, etc.
Note: Performance Monitor can obtain statistics about traffics of ports connected to open-system host groups only. The statistics about traffics of ports connected to mainframe host groups cannot be obtained.
For details on how to use this window, see Monitoring Ports and Monitoring LU Paths.
Figure 4-8 Port-LUN tab of the Performance Management Window When the Port-LUN tab is active, the Performance Management window contains the following items:
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When Monitoring Switch is Enable, Performance Monitor is monitoring the storage system (a Disable setting indicates that the system is not being monitored).•
Gathering Interval indicates that the statistics are collected at the interval displayed here. If the number of the CUs monitored is 64 or less, the value between 1 and 15 appears as a gathering interval by minutes.For example, if 1 min. is displayed, the information obtained every one minute is displayed in the list and the graph. In case 65 or more CUs are monitored, the statistics are displayed every 5, 10 or 15 minutes.
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The drop-down list on the right of Monitoring Data indicates storing period of statistics (monitoring data). The statistics displayed in the Port-LUN tab are stored only in short range. The range of monitoring data that can be displayed in the window is between 8 hours and 15 days depending on the gathering interval.For details on the types of storing period of statistics, see Understanding Statistical Storage Ranges.
For details on the relationship between collection interval and the storing period of the statistics, see Monitoring Options Window.
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Monitoring Term let you narrow the range of statistics that should be displayed in the window.The starting and ending time for collecting statistics is displayed on both sides of the slide bar. Performance Monitor stores the monitoring data between these times, and you can specify desired term within this range as the target to display in lists and graphs.
For example, if you want to view statistics within the range of 10:30 July 1 2007 to 10:30 July 2 2007, you set 2007/07/01 10:30 to the From box, set
2007/07/02 10:30 to the To box, and then click the Apply button.
To set a date and time to the From and To boxes, do either of the following:
– Move the slider to the left or to the right.
– In the text box, select the number that you want to change. Next, click the upward or downward arrow button.
When you specify dates and time in From and To boxes, Performance Monitor calculates the length (in minutes) of the specified period and displays the calculated length. When calculating the length in minutes, Performance Monitor rounds up the fraction.
Note: The From and To boxes are grayed out if the monitoring data (that is, obtained statistics) is not stored in the storage system.
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The Real Time option lets you view statistics in real-time mode, where statistics are updated at a gathering interval you specify between 1 and 15 minutes.When you select the Real Time option, use the drop-down list to select the number of recent collections of statistics which should be displayed in the graph. You can select the number of times from 5 or 90. This setting determines the range of recent statistics to be displayed in the graph. For example, suppose the gathering interval is 1 minute. In this case, if you select 90 from the drop-down list, the graph displays statistics obtained in the last 90 minutes (multiplying 1 minute by 90 times).
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In the Monitoring Data area, the drop-down list on the upper right of the list specifies the type of statistics to be displayed in the window. If you want to view I/O rates, select IOPS (I/Os per second) from the drop-down list. If you want to view transfer rates, select MB/s (megabytes persecond) from the drop-down list.
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The tree contains the Subsystem folder. Below the Subsystem folder are ports (such as and ):This icon indicates the attribute of the stored port is Target, or Initiator/External .
This port icon indicates either of the following:
A Fibre Channel port in Standard mode. LUN security is applied to this port.
If the port name is followed by its fibre address, the port is a Fibre Channel port. For example, CL1-A(EF) indicates that the CL1-A port is a Fibre Channel port.
This port icon indicates either of the following:
A Fibre Channel port in Standard mode. LUN security is not applied to this port.
A Fibre Channel port in High Speed mode. LUN security is applied to this port.
A Fibre Channel port in High Speed mode. LUN security is not applied to this port.
A Fibre Channel port in Initiator/External MIX mode. LUN security is not applied to this port.
A Fibre Channel port in Initiator/External MIX mode. LUN security is applied to this port
When you double-click a port, the host groups ( ) that correspond to that port are displayed. The host group ID appears on the left of the colon (:).
The host group name appears on the right of the colon.
When you double-click a host group, an item named LUN ( ) appears.
When you select LUN, the list on the right lists LU paths.
For details about LUN security, host groups, and LU paths, see the LUN Manager User's Guide.
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The list displays statistics (that is, I/O rates, transfer rates, or average response time). For details on the list contents, see Monitoring Ports and Monitoring LU Paths.•
The SPM button starts the Server Priority Manager program product if that program has been enabled. For details of Server Priority Manager, see Overview of Server Priority Manager and Server Priority Manager Operation.The SPM button is deactivated in real-time mode. To start Server Priority Manager, activate the From and To boxes and release Performance Monitor from real-time mode.
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If the Current Control label displays Port Control, the system iscontrolled by the upper limits and the threshold specified in the Port tab of the Server Priority Manager window.
– If the Current Control label displays WWN Control, the system is controlled by the upper limits and the threshold specified in the WWN tab of the Server Priority Manager window.
– If the Current Control label displays No Control, the system performance is not controlled by Server Priority Manager.
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The Draw button displays a line graph that illustrates changes in the I/O rate or the transfer rate. The graph can display up to eight linessimultaneously.
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The line graph illustrates changes in the I/O rate or the transfer rate. The vertical axis indicates the I/O rate or the transfer rate. The horizontal axis indicates dates and/or times.When the graph displays I/O rates or the transfer rates for a port
controlled by an upper limit or a threshold, the graph also displays a line that indicates the upper limit or the threshold.
When you draw a graph, use the Detail check box and the drop-down list to illustrate the desired information, and use the Chart Y Axis Rate drop-down list to arrange the graph convenient to work.
Figure 4-9 Chart Y Axis Rate Drop-Down List, Detail Check Box, and the Drop-Down List to Select the Item to be Displayed (Port-LUN Tab)
The Chart Y Axis Rate drop-down list lets you select the highest value of the Y-axis (the vertical axis) of the graph.
If you select the Detail check box after drawing a graph by selecting the Draw button, the graph displays detailed statistics as explained. The detailed statistics can be displayed only:
– When you select the Subsystem folder ( ) in the tree and select a port in the list.
The graph displays detailed statistics about workloads on the port selected in the list. For details on the graph, see Viewing Port Workload Statistics.
– When you select LUN ( )in the tree and select a LUN (an address of a volume) in the list.
The graph displays detailed statistics about workloads on the LU paths selected in the list. The information in the graph depends on the item selected in the drop-down list on the right of the Detail check box. For details on the graph see Viewing Workload Statistics on LU Paths.