139 lines
8.3 KiB
HTML
139 lines
8.3 KiB
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<meta name="DC.Title" content="Performance system values: Communications configuration recovery" />
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<meta name="abstract" content="Specifies whether or not recovery attempts are made and how many attempts to take. (QCMNRCYLMT)" />
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<meta name="description" content="Specifies whether or not recovery attempts are made and how many attempts to take. (QCMNRCYLMT)" />
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<title>Performance system values: Communications configuration recovery</title>
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</head>
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<body id="rzakzqcmnrcylmt"><a name="rzakzqcmnrcylmt"><!-- --></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">Performance system values: Communications configuration recovery</h1>
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<div><p>Specifies whether or not recovery attempts are made and how many
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attempts to take. (QCMNRCYLMT)</p>
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<p><span class="uicontrol">Communications configuration recovery</span>, also known
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as <span class="uicontrol">QCMNRCYLMT</span>, is a member of the performance category
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of i5/OS™ system
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values. You can use this system value to specify whether recovery attempts
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are made and how many attempts to make. To learn more, keep reading.</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 colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
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</tr>
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</thead>
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<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
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<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
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select your system, <span class="menucascade"><span class="uicontrol"></span> > <span class="uicontrol">Configuration
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and Service</span> > <span class="uicontrol">System Values</span> > <span class="uicontrol">Performance</span> > <span class="uicontrol">Communications</span></span></td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
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<td valign="top" headers="d0e53 d0e31 ">None</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
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<td valign="top" headers="d0e58 d0e31 ">Do not attempt to recover</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
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<td valign="top" headers="d0e63 d0e31 ">The next time a communications configuration recovery object is varied
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on. A change to this system value does not affect a communications configuration
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object that is already varied on.</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
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<td valign="top" headers="d0e68 d0e31 ">No</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 class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>You may specify
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whether to attempt to recover from a communications failure or not. If you
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select to attempt to recover, you must specify the <span class="uicontrol">Number of recovery
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attempts before sending message</span> and the <span class="uicontrol">Time interval</span> in
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which the recovery attempts must occur.</p>
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<p>If the number of recovery attempts
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is exceeded within the specified time interval, an inquiry message will be
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sent. The inquiry messages go to the configured message queue, which may be
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the system operator message queue or some other message queue. Possible values
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are 0 through 99.</p>
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<p>If recovery attempts are made, but do not exceed the
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number of recovery attempts within the specified time interval, the count
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of recovery attempts is restarted when the time interval restarts.</p>
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<p>If
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your server is attached to a ROLM computerized branch exchange, the recovery
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attempts value should never be 0. Recovery attempts are necessary for the
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server to establish a connection using the ROLM CBX's inbound modem pool.</p>
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<p>You
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can specify the time period in which the recovery attempts can be done. If
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recovery attempts have not been exceeded within the time interval, the count
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of recovery attempts is also reset when the time interval is restarted. The
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message is sent to the configured message queue, which may be the system operator
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queue or a message queue specified on the configuration object. Possible values
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are 0 through 120 minutes.</p>
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<p>When using <span class="uicontrol">Communications configuration
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recovery</span>, consider the following:</p>
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<ul><li>If the number of attempts is greater than 0 and the time interval is equal
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to 0, an infinite number of recovery attempts is made; this is not recommended
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because of the system resources that may be used and because performance may
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be affected.</li>
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<li>If the connection between the iSeries and a personal computer using
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APPC fails on a local area network (LAN) and the server attempts to recover
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the connection, unnecessary work is placed on the system.<div class="note"><span class="notetitle">Note:</span> If automatic
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communications error recovery is not used, manual recovery is necessary, which
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requires operator intervention. A good compromise is to set the automatic
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recovery limits to just one retry.</div>
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<ul><li>Use a count limit of 0 and a time interval of more than 0 to turn off
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second-level error recovery. Turning off second-level recovery may cause the
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devices and controllers to go into recovery pending (RCYPND) state. A message
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indicating that an operator intervention is required is sent to QSYSOPR, or
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the configured message queue. Use manual recovery either to respond to the
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message in QSYSOPR or the configured message queue, or to vary the objects
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off and back on.<div class="note"><span class="notetitle">Note:</span> First-level error recovery is still done. On a LAN,
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the Inactivity Timer is used to determine if the remote system is still available.
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Once the inactivity time expires, first-level error recovery is driven by
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the LANFRMRTY parameter and the LANRSPTMR parameter.</div>
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</li>
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<li>Write applications that can determine if a failure has occurred, and then
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handle the errors. <ul><li>Monitor the error messages in QSYSOPR, or the configured message queue,
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when they occur and handle the condition.</li>
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<li>Monitor the status of the configuration objects by using the Retrieve
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Configuration Status (QDCRCFGS) and List Configuration Descriptions (QDCLCFGD)
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application program interfaces (APIs).</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
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learn more, go to the performance system values overview topic. If you are
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looking for a specific system value or category of system values, try using
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the i5/OS system
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value finder.</p>
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</div>
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</div>
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<div><div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakzperformanceoverview.htm" title="Use i5/OS performance system values to view and change priority, performance adjustments, and processing values for the system.">System values: Performance overview</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="rzakzfinder.htm">System value finder</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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