53 lines
3.3 KiB
HTML
53 lines
3.3 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Adjust LANs for optimum communications performance</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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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="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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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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