95 lines
5.7 KiB
HTML
95 lines
5.7 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>Considerations for communications-related system values</title>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzahjerr-comsysvalref"></a>
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<h4 id="rzahjerr-comsysvalref">Considerations for communications-related system values</h4>
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<p><span class="bold">System values</span>, such as system date and library list,
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control information for the operation of certain parts of the system. You
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can change the system value to define your working environment.</p>
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<p>The following information explains more about each of the system values
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for communications error recovery.</p>
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<ul>
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<li><span class="bold">QCMNARB</span> (communications arbiters): controls the
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number of communication arbiter system jobs that are available to process
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communications functions.
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<ul>
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<li>Do not set this value to zero unless directed by software service. If
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this system value is set to zero, the work is performed in the QSYSARB and
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QLUS system jobs as opposed to being performed by the communication arbiters.</li>
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<li>The QCMNARB system value supports the following values: *CALC, 0-99.</li>
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<li>*CALC is the default setting for this system value. The system determines
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the number of jobs based on the system's HW configuration.</li>
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<li>Consider having more than one QCMNARB job if there is an excessive amount
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of these system activities.</li>
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<li>A change to this value requires an initial program load (IPL) of the system
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for it to take affect.</li></ul></li>
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<li><span class="bold">QPASTHRSVR</span> (pass-through servers): controls how
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many pass-through server jobs are available for processing display station
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pass-through requests.
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<ul>
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<li>The default setting of this system value is calculated based on the hardware
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configuration of your system.</li>
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<li>Consider multiple pass-through server jobs in error recovery situations
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to make the system quicker.</li></ul>
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<a name="wq30"></a>
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<div class="notetitle" id="wq30">Note:</div>
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<div class="notebody">Setting the QPASTHRSVR value to 0 is not recommended.
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The QPASTHRSVR value of 0 is intended for use in migrating from the use of
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communications jobs for the 5250 target display station pass-through function
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to use the pass-through server jobs.</div></li>
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<li><span class="bold">QCMNRCYLMT</span> (communications recovery limit): controls
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the number of automatic recovery attempts to make. It also controls when an
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inquiry message is sent to the system operator when the specified number of
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recovery attempts has been reached.
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<ul>
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<li>If the CMNRCYLMT parameter value is specified as *SYSVAL for a network
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interface description, a line description, or a controller description, then
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the QCMNRCYLMT value is also used. These parameter values also contain a count
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limit and time interval.
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<p>The count limit can be 0 (no recovery attempted)
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to 99. The time interval can be 0, or a value from 1 to 120 (minutes). A count
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limit of 0, and a time interval of more than 0 effectively disables automatic
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second-level error recovery. This may cause the devices and controllers to
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go into recovery pending (RCYPND) state, and require operator intervention.
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A count limit of more than 0, and a time interval of 0 allows automatic second-level
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error recovery continuously. However, this is not recommended.</p>
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<a name="wq31"></a>
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<div class="notetitle" id="wq31">Note:</div>
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<div class="notebody">To avoid looping recovery, keep the number of retries small; you do not want
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time to expire before the number of retries are exceeded. Otherwise, you will
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end up in infinite recovery.</div></li></ul></li>
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<li><span class="bold">QDEVRCYACN</span> (device I/O recovery action): Controls
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the recovery action to take for the job when a device error is encountered
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on a reading and writing operation on the *REQUESTER device for interactive
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jobs.</li></ul>
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<ul>
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<li>For more information about iSeries™ communications, see the <a href="../books/sc415406.pdf" target="_blank">Communications Management</a> and <a href="../rzaks/rzaks.pdf" target="_blank">Work Management</a>
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<img src="wbpdf.gif" alt="Link to PDF" /> books.</li>
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<li><img src="delta.gif" alt="Start of change" />For more Information about pass-through server jobs, see the <a href="../books/sc415402.pdf" target="_blank">Remote Work Station Support</a>
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<img src="wbpdf.gif" alt="Link to PDF" /> book.<img src="deltaend.gif" alt="End of change" /></li></ul>
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