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131 lines
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<meta name="DC.Title" content="Scenario: System monitor" />
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<meta name="abstract" content="See an example system monitor that alerts you if the CPU utilization gets too high and temporarily holds any lower priority jobs until more resources become available." />
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<title>Scenario: System monitor</title>
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<body id="rzahxmonsystemexample"><a name="rzahxmonsystemexample"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Scenario: System monitor</h1>
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<div><p>See an example system monitor that alerts you if the CPU utilization
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gets too high and temporarily holds any lower priority jobs until more resources
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become available.</p>
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<div class="section" id="rzahxmonsystemexample__situation"><a name="rzahxmonsystemexample__situation"><!-- --></a><h4 class="sectionscenariobar">Situation</h4><p>As
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a system administrator, you need to ensure that the <span class="keyword">iSeries™</span> system
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has enough resources to meet the current demands of your users and business
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requirements. For your system, CPU utilization is a particularly important
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concern. You would like the system to alert you if the CPU utilization gets
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too high and to temporarily hold any lower priority jobs until more resources
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become available.</p>
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<p>To accomplish this, you can set up a system monitor
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that sends you a message if CPU utilization exceeds 80%. Moreover, it can
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also hold all the jobs in the QBATCH job queue until CPU utilization drops
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to 60%, at which point the jobs are released, and normal operations resume.</p>
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<p><strong>Configuration
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example</strong></p>
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<p>To set up a system monitor, you need to define what metrics
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you want to track and what you want the monitor to do when the metrics reach
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specified levels. To define a system monitor that accomplishes this goal,
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complete the following steps:</p>
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<ol><li>In <span class="keyword">iSeries Navigator</span>, expand <span class="menucascade"><span class="uicontrol">Management Central </span> > <span class="uicontrol">Monitors</span></span>, right-click <span class="uicontrol">System Monitor</span>, and select <span class="uicontrol">New
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Monitor...</span></li>
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<li>On the <span class="uicontrol">General</span> page, enter a name and description
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for this monitor.</li>
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<li>Click the <span class="uicontrol">Metrics</span> tab, and enter the following
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values: <ol type="a"><li>Select the <span class="uicontrol">CPU Utilization Basic (Average)</span>, from
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the list of Available Metrics, and click <span class="uicontrol">Add</span>. CPU Utilization
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Basic (Average) is now listed under Metrics to monitor, and the bottom portion
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of the window displays the settings for this metric.</li>
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<li>For <span class="uicontrol">Collection interval</span>, specify how often you
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would like to collect this data. This will override the Collection Services
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setting. For this example, specify <span class="uicontrol">30 seconds</span>.</li>
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<li>To change the scale for the vertical axis of the monitor's graph for this
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metric, change the <span class="uicontrol">Maximum graphing value</span>. To change
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the scale for the horizontal axis of the graph for this metric, change the
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value for <span class="uicontrol">Display time</span>.</li>
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<li>Click the <span class="uicontrol">Threshold 1</span> tab for the metrics settings,
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and enter the following values to send an inquiry message if the CPU Utilization
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is greater than or equal to 80%: <ol type="i"><li>Select <span class="uicontrol">Enable threshold.</span></li>
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<li>For the threshold trigger value, specify <span class="uicontrol">>= 80</span> (greater
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than or equal to 80 percent busy).</li>
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<li>For <span class="uicontrol">Duration</span>, specify <span class="uicontrol">1</span> interval.</li>
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<li>For the <span class="uicontrol"><span class="keyword">i5/OS™</span> command</span>,
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specify the following: <pre>SNDMSG MSG('Warning,CPU...') TOUSR(*SYSOPR) MSGTYPE(*INQ)</pre>
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</li>
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<li>For the threshold reset value, specify <span class="uicontrol">< 60</span> (less
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than 60 percent busy). This will reset the monitor when CPU utilization falls
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below 60%.</li>
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</ol>
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</li>
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<li>Click the <span class="uicontrol">Threshold 2</span> tab, and enter the following
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values to hold all the jobs in the QBATCH job queue when CPU utilization stays
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above 80% for five collection intervals: <ol type="i"><li>Select <span class="uicontrol">Enable threshold</span>.</li>
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<li>For the threshold trigger value, specify <span class="uicontrol">>= 80</span> (greater
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than or equal to 80 percent busy).</li>
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<li>For <span class="uicontrol">Duration</span>, specify <span class="uicontrol">5</span> intervals.</li>
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<li>For the <span class="uicontrol"><span class="keyword">i5/OS</span> command</span>,
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specify the following: <pre>HLDJOBQ JOBQ(QBATCH)</pre>
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</li>
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<li>For the threshold reset value, specify <span class="uicontrol">< 60</span> (less
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than 60 percent busy). This will reset the monitor when CPU utilization falls
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below 60%.</li>
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<li>For <span class="uicontrol">Duration</span>, specify <span class="uicontrol">5</span> intervals.</li>
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<li>For the <span class="uicontrol"><span class="keyword">i5/OS</span> command</span>,
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specify the following: <pre>RLSJOBQ JOBQ(QBATCH)</pre>
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<p>This
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command releases the QBATCH job queue when CPU utilization stays below 60%
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for 5 collection intervals.</p>
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</li>
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</ol>
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</li>
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</ol>
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</li>
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<li>Click the <span class="uicontrol">Actions</span> tab, and select <span class="uicontrol">Log
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event</span> in both the <span class="uicontrol">Trigger</span> and <span class="uicontrol">Reset</span> columns.
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This action creates an entry in the event log when the thresholds are triggered
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and reset.</li>
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<li>Click the <span class="uicontrol">Systems and groups</span> tab to specify the
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systems and groups you want to monitor.</li>
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<li>Click <span class="uicontrol">OK</span> to save the monitor.</li>
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<li>From the list of system monitors, right-click the new monitor and select <span class="uicontrol">Start</span>.</li>
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</ol>
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<p><strong>Results</strong></p>
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<p>The new monitor displays the CPU utilization,
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with new data points being added every 30 seconds, according to the specified
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collection interval. The monitor automatically carries out the specified threshold
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actions, even if your PC is turned off, whenever CPU utilization reaches 80%.</p>
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<div class="note"><span class="notetitle">Note:</span> This
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monitor tracks only CPU utilization. However, you can include any number of
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the available metrics in the same monitor, and each metric can have its own
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threshold values and actions. You can also have several system monitors that
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run at the same time.</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahxmonexample.htm" title="Provides scenarios that show how you can use some of the different types of monitors to look at specific aspects of your system's performance.">Scenarios: iSeries Navigator monitors</a></div>
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</div>
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</div>
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</body>
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