72 lines
4.0 KiB
HTML
72 lines
4.0 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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<head>
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<meta name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Determine the disk units that are needed" />
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<meta name="DC.Relation" scheme="URI" content="rzalymirrorplan.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalyplnaspcap.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalyplntotcap.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2002, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="hdrmirror2" />
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<meta name="DC.Language" content="en-us" />
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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>Determine the disk units that are needed</title>
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</head>
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<body id="hdrmirror2"><a name="hdrmirror2"><!-- --></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">Determine the disk units that are needed</h1>
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<div><p>A mirrored disk pool requires twice as much storage as a disk pool that
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is not mirrored because the system keeps two copies of all the data in the
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disk pool. Also, mirrored protection requires an even number of disk units
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of the same capacity so that disk units can be made into mirrored pairs. On
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an existing system, it is not necessary to add the same types of disk units
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already attached to provide the required additional storage capacity. Any
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new disk units may be added as long as sufficient total storage capacity and
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an even number of storage units of each size are present. The system assigns
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mirrored pairs and automatically move the data as necessary. If a disk pool
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does not contain sufficient storage capacity, or if storage units cannot be
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paired, mirror protection cannot be started for that disk pool.</p>
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<p>The process of determining the disk units that are needed for mirrored
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protection is similar for existing or new systems. You and your IBM<sup>®</sup> marketing
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representative should do the following: </p>
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<ol><li>Plan for storage capacity.</li>
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<li>Plan a target percent of storage used for the disk pool (how full the
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disk pool can be).</li>
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<li>Plan the number and type of disk units needed to provide the storage that
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is required. For an existing disk pool, you can plan a different type and
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model of disk unit to provide the required storage. You must ensure an even
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number of each type of disk unit and model.</li>
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<li>Plan for disk pools. </li>
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<li>Plan total storage capacity. </li>
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</ol>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzalyplnaspcap.htm">Plan for storage capacity</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyplnspare.htm">Plan for spare disk units</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyplntotcap.htm">Plan for total storage capacity</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalymirrorplan.htm">Plan for mirrored protection</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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