75 lines
4.8 KiB
HTML
75 lines
4.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Select bus-level or IOP-level partitioning" />
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<meta name="abstract" content="Depending on your needs, there can be advantages to partitioning your I/O resources in different ways." />
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<meta name="description" content="Depending on your needs, there can be advantages to partitioning your I/O resources in different ways." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Select bus-level or IOP-level partitioning</title>
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</head>
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<body id="rzaitchoosebusiop"><a name="rzaitchoosebusiop"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Select bus-level or IOP-level partitioning</h1>
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<div><p>Depending on your needs, there can be advantages to partitioning
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your I/O resources in different ways.</p>
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<div class="section"><h4 class="sectiontitle">Bus-level partitioning</h4><p>With bus-level I/O partitioning,
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you dedicate an I/O bus and all resources on the bus to the same partition.
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A partition using the bus-level configuration, all I/O (included the alternate
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IPL device, console, and electronic customer support device) is dedicated
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and no resources are dynamically switched into or out of the partition. On
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a server that has partitions at the bus level, all buses are owned dedicated
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by their respected partitions and no devices are switched.</p>
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<p>Bus-level
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logical partitions allow for:</p>
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<ul><li>Better problem isolation and therefore higher availability.</li>
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<li>Better performance.</li>
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<li>Simplified hardware management.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">IOP-level partitioning</h4><p>When you partition a bus
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at the IOP level, you share the bus and divide up the I/O resources by IOP.
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This type of logical partitions allows for:</p>
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<ul><li>Greater flexibility with partition I/O subsystems.</li>
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<li>Potential cost reduction by eliminating some expansion units that you
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may need to support additional buses.</li>
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<li>Optimization of hardware resources to avoid server limits such as 19 buses
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per server (only on AS/400e™ models).</li>
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<li>The ability to dynamically switch an IOP from one logical partition to
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another without the need to restart the server.</li>
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<li>Simplified configuration planning since hardware movement is not necessary.</li>
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</ul>
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<p>Additionally, it is possible to configure a partition to utilize both
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dedicated buses and dedicated IOPs on shared buses.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaitunderstandhardware.htm" title="Determine if your hardware resources meet the minimum requirements needed to partition your server. Evaluate each iSeries model to determine how your hardware will function once you partition your server.">Hardware requirements for logical partitions</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaitdynamic.htm" title="A powerful advantage of logical partitions is ability to dynamically switch an IOP from one partition to another.">Dynamically switching IOPs between partitions</a></div>
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<div><a href="rzaitchooseded.htm" title="Use this information to determine if dedicated or switchable IOP are right for your partitioned environment.">Choose dedicated or switchable IOP and devices for logical partitions</a></div>
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</div>
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</div>
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</body>
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</html>
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