65 lines
4.1 KiB
HTML
65 lines
4.1 KiB
HTML
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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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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<title>WAN configuration considerations for IOPs</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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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-wanspdfacts"></a>
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<h4 id="rzajtper-wanspdfacts">WAN configuration considerations for IOPs</h4>
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<p>When configuring a communications controller, you should consider both
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subsystem storage and aggregate line speed. Subsystem storage is the amount
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of storage available on the communications controller. Aggregate line speed
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is the sum of individual lines speeds that are attached to the communications
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controller.</p>
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<p>The following information can help you understand network configuration
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considerations for input/output processors (IOPs).</p>
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<ul>
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<li>For interactive environments, you should not exceed 60% use on the communications
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IOP. Exceeding this threshold in a large transfer environment or with a small
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number of concurrent users might still offer acceptable performance. Use the iSeries™ system performance tools to get the utilization.</li>
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<li>You can attach multiple IOPs to an iSeries system. The maximum number of IOPs
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that can be attached is determined by the iSeries server model. It is important to distribute
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the work load across several IOPs if the performance capabilities of a single
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IOP are exceeded.</li>
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<li>Even though an IOP can support certain configurations, a given iSeries server model
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might not have enough system resource (for example, CPU processing capacity)
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to support the work load over the lines.</li>
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<li>The use of larger frames generally improves large transfer performance
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in terms of capacity for the communications IOP and in terms of system response
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time. The amount of time that the IOP spends processing a larger frame is
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only slightly more than the amount needed to process a smaller frame. If you
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use larger frames to transfer a single system message or block of data, the
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total number of frames required to complete the transfer are decreased.</li>
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<li>The values for IOP use in synchronous data link control (SDLC) environments
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do not necessarily increase consistently with the number of workstations or
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with the workload. An IOP can spend more time polling when the application
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is not using the line. It is possible to see a relatively high IOP use at
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low throughput levels.</li></ul>
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<ul>
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<li>For information on 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.</li>
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<li>For more information on performance tools, see the <a href="../books/sc415340.pdf" target="_blank">Performance Tools for iSeries</a>
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<img src="wbpdf.gif" alt="Link to PDF" /> book.</li></ul>
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</html>
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