53 lines
3.3 KiB
HTML
53 lines
3.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Adjust LANs for optimum communications performance</title>
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<a name="rzajtper-lanprofacts"></a>
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<h4 id="rzajtper-lanprofacts">Adjust LANs for optimum communications performance</h4>
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<p>Local area networks (LAN) affect the communications performance on the iSeries™ server. Improvements to LAN input/output (IOPs) in the areas of increased
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central processing unit (CPU) time, IOP capacity, and support of IOP assist
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make them more efficient. This efficiency allows advanced program-to-program
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communications (APPC) to send request units to the IOP, passing the cost of
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processing frames to the IOP.</p>
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<p>The following information can help you understand the protocol considerations
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for local area networks.</p>
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<ul>
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<li>A Data Link Control (DLC) can achieve a significantly higher data rate
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than other supported line types. This is due to the desirable combination
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of having a high media speed along with large frame sizes.</li>
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<li>When several sessions use a line or LAN concurrently, the aggregate data
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rate might be higher than when only one session is used.</li>
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<li>To achieve good performance in a multi-user interactive LAN environment,
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you should manage the number of active users so that LAN media use does not
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exceed 50%. (A 25% utilization is recommended for Ethernet environments because
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of media collisions that causes the program to loop). Operating at higher
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utilization might decrease response time because of excess queueing time for
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the line. In a large transfer environment in which a small number of users
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contend for the line, a higher line use might still offer acceptable performance.</li></ul>
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<p>For more information about iSeries server configuration, see the <a href="../books/c4154010.pdf" target="_blank">Communications Configuration</a>
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<img src="wbpdf.gif" alt="Link to PDF" /> book.</p>
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