2. MARCO TEÓRICO
2.12. Problemas nutricionales relacionados con el consumo excesivo y deficiente de
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 WWN tab, which lets you view statistics (I/O rates, transfer rates, and average response time) about traffic between host bus adapters in the hosts and ports on the storage system.
Caution: The WWN tab is unavailable if Server Priority Manager is not enabled.
Note: A WWN (Worldwide Name) is a 16-digit hexadecimal number used as the unique identifier for a host bus adapter. Host bus adapters are
contained in hosts and serve as ports for connecting the hosts and the storage system. One WWN represents one host bus adapter.
For details on how to use this window, see Monitoring Paths between Host Bus Adapters and Ports.
Figure 4-11 WWN tab of the Performance Management Window
When the WWN 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 to be 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.•
The drop-down list on the right of Monitoring Data indicates storing period of statistics (monitoring data). The statistics displayed in the WWN tab are stored only in short range, therefore, short-range is displayed in this drop-down list and you cannot change it. The range of monitoring data that can be displayed in the window is between 8 hours and 15 daysdepending 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 are displayed on both sides of the slide bar. Performance Monitor stores the monitoring data between these times, and you can specify the desired term within this range. Statistics for the specified term will be displayed in list and graph formats.
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 per second) from the drop-down list.•
The tree contains the Subsystem folder. Below the Subsystem folder are SPM groups, which are groups of multiple WWNs. When you double-click an SPM group ( ), the host bus adapters ( ) belonging to that SPM group are displayed. The WWN and the SPM name of the host bus adapter are displayed to the right of the icon. If you double-click Not Grouped in the tree, host bus adapters (WWNs) that do not belong to any SPM group are displayed.Note: If the WWN of a host bus adapter (HBA) is displayed in red in the tree, the host bus adapter is connected to two or more ports, but the traffic between the HBA and some of the ports are not monitored by Performance Monitor. When many-to-many connections are established between HBAs and ports, make sure that all the traffic between HBAs and ports is
monitored (see Monitoring All Traffic between HBAs and Ports for instructions).
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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 Paths between Host Bus Adapters and Ports.•
The SPM button starts the Server Priority Manager program product if Server Priority Manager is enabled. For details of Server Priority Manager, see Overview of Server Priority Manager and Server Priority Manager . 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.•
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 usage rates (in percentage). The horizontal axis indicates dates and/or times.When the graph displays I/O rates or the transfer rates for a host bus adapter or an SPM group controlled by an upper limit, the graph also displays a line that indicates the upper limit.
When you draw a graph, the Chart Y Axis Rate drop-down list lets you select the highest value of the Y-axis (the vertical axis) of the graph.
Figure 4-12 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)