140 lines
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140 lines
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<title>Identify and resolve common performance problems</title>
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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">Identify and resolve common performance problems</h1>
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<div><p>Many different performance problems often affect common areas of
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the <span class="keyword">iSeries™</span> server. Learn how
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to research and resolve problems in common areas, for example, backup and
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recovery.</p>
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<p>When performance problems occur on the <span class="keyword">iSeries</span> server,
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they often affect certain areas of the system first. Refer to the following
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table for some methods available for researching performance on these system
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areas. Many of these areas are available as system monitor metrics. However,
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there are several other ways to access information about them.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e32">Area</th>
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<th valign="top" id="d0e34">Description</th>
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<th valign="top" id="d0e36">Available tools</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e32 ">Processor load</td>
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<td valign="top" headers="d0e34 ">Determine if there are too many jobs on the system or if some jobs
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are using a large percentage of processor time.</td>
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<td valign="top" headers="d0e36 "><ul><li><span class="cmdname">Work with Active Jobs (WRKACTJOB)</span> command.</li>
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<li><span class="cmdname">Work with System Activity (WRKSYSACT)</span> command, which
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is part of Performance Tools licensed program.</li>
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<li>The work management function in <span class="keyword">iSeries Navigator</span>.</li>
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<li>CPU utilization metrics within the <span class="keyword">iSeries Navigator</span> system
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monitor.</li>
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<li><span class="cmdname">Work with Disk Status (WRKDSKSTS)</span> command.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">Main storage</td>
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<td valign="top" headers="d0e34 ">Investigate faulting and the wait-to-ineligible transitions.</td>
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<td valign="top" headers="d0e36 "><ul><li>Disk storage metrics within the <span class="keyword">iSeries Navigator</span> system
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monitor.</li>
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<li><span class="cmdname">Work with System Status (WRKSYSSTS)</span> command.</li>
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<li>The Memory Pools function under Work Management in <span class="keyword">iSeries Navigator</span>.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">Disk</td>
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<td valign="top" headers="d0e34 ">Determine if there are too few arms or if the arms are too slow.</td>
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<td valign="top" headers="d0e36 "><ul><li><span class="cmdname">Work with Disk Status (WRKDSKSTS)</span> command.</li>
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<li>Disk arm utilization metrics within the <span class="keyword">iSeries Navigator</span> system
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monitor.</li>
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<li>Performance Tools System and Component report.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">Communications</td>
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<td valign="top" headers="d0e34 ">Find slow lines, errors on the line, or too many users for the line.</td>
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<td valign="top" headers="d0e36 "><ul><li>Performance Tools Component Report.</li>
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<li>LAN utilization metrics within the <span class="keyword">iSeries Navigator</span> system
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monitor.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">IOPs</td>
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<td valign="top" headers="d0e34 ">Determine if any IOPs are not balanced or if there are not enough IOPs.</td>
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<td valign="top" headers="d0e36 "><ul><li>Performance Tools Component Report.</li>
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<li>IOP utilization metrics within the <span class="keyword">iSeries Navigator</span> system
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monitor.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">Software</td>
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<td valign="top" headers="d0e34 ">Investigate locks and mutual exclusions (mutexes).</td>
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<td valign="top" headers="d0e36 "><ul><li>Performance Tools Locks report.</li>
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<li>Performance Tools Trace report.</li>
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<li><span class="cmdname">Work with Object Locks (WRKOBJLCK)</span> command.</li>
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<li>In <span class="keyword">iSeries Navigator</span>, right-click
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on the suspect job under Work Management, and select <span class="menucascade"><span class="uicontrol">Details</span> > <span class="uicontrol">Locked Objects</span></span>.</li>
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<li><img src="./delta.gif" alt="Start of change" />WRKSYSACT Option 6.<img src="./deltaend.gif" alt="End of change" /></li>
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<li><img src="./delta.gif" alt="Start of change" />DSPPFRDTA. F6, Option 6.<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e32 ">Backup and recovery</td>
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<td valign="top" headers="d0e34 ">Investigate areas that affect backup and recovery and save and restore
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operations.</td>
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<td valign="top" headers="d0e36 "><ul><li><span class="keyword">iSeries</span> Performance Capabilities
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Reference (Save/Restore Performance chapter).</li>
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<li>Why does my backup take so long after I restart my server?</li>
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<li>Why do my backups take longer after I upgrade to a new release?</li>
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<li>Why do my backups take longer after I change hardware on my server?</li>
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</ul>
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</td>
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</tr>
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</tbody>
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</table>
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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="../rzaks/rzaks1.htm">Work management function in iSeries Navigator</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="rzahxmonconmetrics.htm" title="To effectively monitor system performance, you must decide which aspects of system performance you want to monitor. Management Central offers a variety of performance measurements, known as metrics, to help you pinpoint different aspects of system performance.">Monitor metrics</a></div>
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<div><a href="../rzakw/rzakwfaq.htm">Frequently asked questions</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 (Save/Restore Performance chapter)</a></div>
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</div>
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</div>
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