107 lines
7.4 KiB
HTML
107 lines
7.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<meta name="DC.Title" content="Scenario: Improve system performance after an upgrade or migration" />
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<meta name="abstract" content="In this scenario, you have just upgraded or migrated your system and it now appears to be running slower than before. This scenario will help you identify and fix your performance problem." />
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<meta name="description" content="In this scenario, you have just upgraded or migrated your system and it now appears to be running slower than before. This scenario will help you identify and fix your performance problem." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Scenario: Improve system performance after an upgrade or migration</title>
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</head>
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<body id="rzahxcollectinfoexample"><a name="rzahxcollectinfoexample"><!-- --></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: Improve system performance after an upgrade or migration</h1>
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<div><p>In this scenario, you have just upgraded or migrated your system
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and it now appears to be running slower than before. This scenario will help
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you identify and fix your performance problem.</p>
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<div class="section" id="rzahxcollectinfoexample__situation"><a name="rzahxcollectinfoexample__situation"><!-- --></a><h4 class="sectionscenariobar">Situation</h4><p>You
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recently upgraded your <span class="keyword">iSeries™</span> server
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to the newest release. After completing the upgrade and resuming normal operations,
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your system performance has decreased significantly. You would like to identify
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the cause of the performance problem and restore your system to normal performance
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levels.</p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Details</h4><p>Several
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problems may result in decreased performance after upgrading the operating
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system. You can use the performance management tools included in <span class="keyword">i5/OS™</span> and Performance Tools licensed
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program (5722-PT1) to get more information about the performance problem and
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to narrow down suspected problems to a likely cause.</p>
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<ol><li>Check CPU utilization. Occasionally, a job will be unable to access some
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of its required resources after an upgrade. This may result in a single job
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consuming an unacceptable amount of the CPU resources.<ul><li>Use WRKSYSACT, WRKSYSSTS, WRKACTJOB, or <span class="keyword">iSeries Navigator</span> system
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monitors to find the total CPU utilization.</li>
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<li>If CPU utilization is high, for example, greater than 90%, check the amount
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of CPU utilized by active jobs. If a single job is consuming more than 30%
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of the CPU resources, it may be missing file calls or objects. You can then
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refer to the vendor, for vendor-supplied programs, or the job's owner or programmer
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for additional support.</li>
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</ul>
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</li>
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<li>Start a performance trace with the STRPFRTRC command, and then use the
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system and component reports to identify and correct the following possible
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problems:<ul><li>If the page fault rate for the machine pool is higher than 10 faults/second,
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give the machine pool more memory until the fault rate falls below this level.</li>
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<li>If the disk utilization is greater than 40%, look at the waiting and service
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time. If these values are acceptable, you may need to reduce workload to manage
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priorities.</li>
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<li>If the IOP utilization is greater than 60%, add an additional IOP and
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assign some disk resource to it.</li>
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<li>If the page faults in the user pool are unacceptably high, refer to the
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topic Automatically tune performance.</li>
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</ul>
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</li>
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<li>Run the job summary report and refer to the <span class="uicontrol">Seize lock conflict
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report</span>. If the number of seize or lock conflicts is high, ensure
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that the access path size is set to 1TB. If the seize or lock conflicts are
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on a user profile, and if the referenced user profile owns many objects, reduce
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the number of objects owned by that profile.</li>
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<li>Run iDoctor with the <span class="uicontrol">Task switch</span> option for five
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minutes. Then analyze the resulting trace data with the task switch monitor.
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Identify and resolve any of the following:<ul><li>Jobs waiting for CPU</li>
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<li>Jobs faulting</li>
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<li>Seize conflicts</li>
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</ul>
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</li>
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</ol>
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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="rzahxresearchparent.htm" title="There are many options available to help you identify and resolve performance problems. Learn how to use the available tools and reports that can help you find the source of the performance problem.">Research a performance problem</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahxreportperftools.htm" title="Performance Tools reports provide information on data that has been collected over time. Use these reports to get additional information about the performance and use of system resources.">Performance Tools reports</a></div>
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<div><a href="rzahxtuneautotune.htm" title="Most users should set up the system to make performance adjustment automatically. When new systems are shipped, they are configured to adjust automatically.">Automatically tune performance</a></div>
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<div><a href="rzahxidoctor.htm" title="The iDoctor for iSeries plugin consists of a variety of software tools for managing performance, for example, PEX Analyzer for detailed trace data analysis and Job Watcher for trace-level information about a job's behavior.">iDoctor for iSeries</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/strpfrtrc.htm">STRPFRTRC command</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../books/sc410607.pdf" target="_blank">iSeries Performance Capabilities Reference PDF</a></div>
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</div>
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</div>
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</body>
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</html>
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