63 lines
3.5 KiB
HTML
63 lines
3.5 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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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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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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<meta name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Determine the hardware that is needed for mirroring" />
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<meta name="DC.Relation" scheme="URI" content="rzalymirrorplan.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalymirror4a.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalymirror4b.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="hdrmirror4" />
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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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<!-- 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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<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 hardware that is needed for mirroring</title>
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</head>
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<body id="hdrmirror4"><a name="hdrmirror4"><!-- --></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 hardware that is needed for mirroring</h1>
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<div><p>In order to communicate with the rest of the system, disk units are attached
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to I/O adapters, which are attached to I/O processors, which are attached
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to buses. The number of each of these types of disk-related hardware that
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are available on the system directly affects the level of protection that
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is possible.</p>
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<p>To provide the best protection and performance, each level of hardware
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should be balanced under the next level of hardware. That is, the disk units
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of each device type and model should be evenly distributed under their I/O
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adapters. The same number of I/O adapters should be under each I/O processor
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for that disk type. The I/O processors should be balanced among the available
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buses.</p>
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<p>To plan what disk-related hardware is needed for your mirrored
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system, you must plan the total number and type of disk units (old and new),
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that are needed on the system, as well as the level of protection for the
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system. It is not always possible to plan for and configure a system so that
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all mirrored pairs meet the planned level of protection. However, it is possible
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to plan a configuration in which a large percentage of the disk units on the
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system achieve the required level of protection.</p>
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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="rzalymirror4a.htm">Plan the minimum hardware needed to function</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalymirror4b.htm">Plan additional hardware to achieve the level of protection</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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