66 lines
4.5 KiB
HTML
66 lines
4.5 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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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="Physical planning requirements" />
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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>Physical planning requirements</title>
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</head>
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<body id="rzalyphysicalplanning"><a name="rzalyphysicalplanning"><!-- --></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">Physical planning requirements</h1>
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<div><p>Depending on how you plan to use independent disk pools, you must satisfy
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the following physical planning requirements:</p>
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<div class="section"><h4 class="sectiontitle">Multisystem clustered environment (for switchable independent
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disk pools)</h4><p>High-speed link (HSL) cables must be used to attach
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the expansion units to the servers in the cluster. </p>
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<p>The expansion unit
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must be physically adjacent in the HSL loop to the alternate system or expansion
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unit owned by the alternative system. You can include a maximum of two servers
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(cluster nodes) on each HSL loop, though each server can be connected to multiple
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HSL loops. You can include a maximum of four expansion units on each HSL loop,
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though a maximum of three expansion units can be included on each loop segment.
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On an HSL loop containing two servers, two segments exist, separated by the
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two servers. All expansion units on one loop segment must be contained in
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the same device cluster resource group (CRG).</p>
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<div class="p"><img src="./delta.gif" alt="Start of change" />In order
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for an expansion unit to become switchable it must physically be the farthest
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away from the owning server on the loop segment. <div class="note"><span class="notetitle">Note:</span> An error will occur
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if you try to make an expansion unit switchable if there is another expansion
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unit farther away the owning server that has not become switchable.</div>
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<div class="fignone"><span class="figcap">Figure 1. These expansion units are all private and are not switchable.</span><br /><img src="./delta.gif" alt="Start of change" /><img src="rzaly500.gif" alt="This is an
example of units that are not switchable." /><img src="./deltaend.gif" alt="End of change" /><br /></div>
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<div class="fignone"><span class="figcap">Figure 2. The expansion unit farthest away from the owning
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server on the loop segment has been made switchable.</span><br /><img src="./delta.gif" alt="Start of change" /><img src="rzaly509.gif" alt="This is an
example of one expansion unit that has been made switchable. The other units
are still private." /><img src="./deltaend.gif" alt="End of change" /><br /></div>
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<img src="./deltaend.gif" alt="End of change" /></div>
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<p>The switchable expansion unit must be SPCN-cabled to the system unit that
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will initially serve as the primary node for the switchable hardware group
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(device CRG). The primary node might be a primary or secondary logical partition
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within the system unit. If using logical partitions, the system buses in the
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intended expansion unit must be owned and dedicated by the partition involved
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in the cluster.</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="rzalyplan.htm">Plan for independent disk pools</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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