59 lines
3.6 KiB
HTML
59 lines
3.6 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 WAN protocols for optimum iSeries server 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-wanprofacts"></a>
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<h4 id="rzajtper-wanprofacts">Adjust WAN protocols for optimum iSeries server performance</h4>
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<p>Wide area network (WAN) protocols affect the communications performance
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on the iSeries™ server. Let us use X.25 for our example. For each X.25 communications
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controller, the iSeries server has some processing limitations for the
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line, the line speed, and the total number of virtual circuits that can be
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used. Performance degradation can be reduced by observing these limitations.</p>
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<p>To optimize the iSeries system performance for wide area networks, perform
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these tasks:</p>
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<ul>
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<li>Reduce the total number of frames by using larger frames.</li>
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<li>To take advantage of these large frame sizes, change the MAXFRAME parameter
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on the line description (LIND) to reflect the maximum value. For X.25, increase
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the DFTPKTSIZE and MAXFRAME parameters to their maximum value.</li>
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<li>Configure a WAN line as full-duplex to provide you with a higher throughput
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for applications that can take advantage of this mode. This can also provide
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higher throughput for multiple users.</li>
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<li>Increase frame relay to capacity.</li></ul>
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<p>The data rate for a given protocol might increase as frame size increases.
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Under these circumstances, the central processing unit (CPU) and the input/output
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processor (IOP) do not do as much processing. Fewer and larger frames also
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make more efficient use of the communications line (higher effective data
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rate) because of fewer overhead bytes and line turn-arounds.</p>
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<p>Frame relay has equivalent performance over RS449, X.21, and V.35 assuming
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equal line speeds and conditions. Frame relay performance (CPU time) is similar
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to or slightly better than Synchronous Data Link Control. For properly tuned
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large transfer applications, the CPU and IOP have no problem using the line
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speed to capacity.</p>
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<p>For information about configuring iSeries system communications, 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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