67 lines
4.0 KiB
HTML
67 lines
4.0 KiB
HTML
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<title>Considerations for network attributes that can affect APPC error recovery</title>
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzahjerr-comnetattref"></a>
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<h4 id="rzahjerr-comnetattref">Considerations for network attributes that can affect APPC error recovery</h4>
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<p><span class="bold">Network attributes</span> control information about the
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communications environment. Allow APPN virtual controller support (ALWVRTAPPN),
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and virtual controller autocreate APPC device limit (VRTAUTODEV) are network
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attributes that play a role when a communications error occurs.</p>
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<p>The following information explains more about each network attribute and
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how the attribute affects system performance during error recovery.</p>
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<ul>
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<li>Allow APPN virtual controller support (ALWVRTAPPN) controls whether APPN
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devices should be attached to real APPN controllers, or to a virtual controller.
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<ul>
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<li>The default value is *NO.</li>
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<li>Use virtual APPN controllers to limit the number of devices that go into
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error recovery when a failure occurs.</li>
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<li>May be used to eliminate multiple device descriptions that can get created
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when multiple routes through the APPN network exist.</li></ul></li>
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<li>Virtual controller autocreate APPC device limit (VRTAUTODEV) indicates
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the maximum number of automatically created APPC devices for each virtual
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controller when the following is true:
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<ul>
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<li>The Allow APPN Virtual Controller (ALWVRTAPPN) network attribute is *YES.</li>
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<li>The Allow HPR Transport Tower (ALWHPRTWR) network attribute is *YES.</li></ul>
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<p> The VRTAUTODEV network attribute specifies the upper limit for the
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number of automatically created APPC devices on virtual controllers. The more
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APPC devices created, the longer it takes the system to do error recovery
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processing on the controller. The default value on this network attribute
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is 100. For every 100 new APPN locations that your system communicates, a
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new virtual APPN controller is created.</p>
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<a name="wq32"></a>
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<div class="notetitle" id="wq32">Note:</div>
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<div class="notebody">Manually created devices
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may still be created if the VRTAUTODEV parameter value is less than the limit
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of 254.</div></li></ul>
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<p>For more information about these system values, see the following books:</p>
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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></ul>
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