72 lines
4.3 KiB
HTML
72 lines
4.3 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="Mirrored protection" />
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<meta name="DC.Relation" scheme="URI" content="rzalygeobenefits.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalydpp.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalypoolthreshold.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.Identifier" content="hdrmirror" />
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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>Mirrored protection</title>
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</head>
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<body id="hdrmirror"><a name="hdrmirror"><!-- --></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">Mirrored protection</h1>
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<div><p>Mirrored protection is a software availability function that protects data
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from being lost because of failure or because of damage to a disk-related
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component. Data is protected because the system keeps two copies of data on
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two separate disk units. When a disk-related component fails, the system may
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continue to operate without interruption by using the mirrored copy of the
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data until the failed component is repaired.</p>
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<p><img src="./delta.gif" alt="Start of change" />When you start mirrored protection or add disk units to a
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disk pool that has mirrored protection, the system creates mirrored pairs
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using disk units that have similar capacities. The overall goal is to protect
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as many disk-related components as possible. To provide maximum hardware redundancy
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and protection, the system attempts to pair disk units that are attached to
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I/O buses, I/O adapter, I/O processors, buses, and expansion units. <img src="./deltaend.gif" alt="End of change" /></p>
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<p>If a disk failure occurs, mirrored protection is intended to prevent data
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from being lost. Mirrored protection is a software function that uses duplicates
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of disk-related hardware components to keep your system available if one of
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the components fails. It can be used on any model of iSeries™ servers and is a part of the
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Licensed Internal Code.</p>
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<p>Remote mirroring support allows you to have one mirrored unit within a
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mirrored pair at the local site, and the second mirrored unit at a remote
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site. For some systems, standard disk unit mirroring will remain the best
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choice; for others, remote disk unit mirroring provides important additional
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capabilities. You must evaluate the uses and needs of your system, consider
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the advantages and disadvantages of each type of mirroring support, and decide
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which is best for you.</p>
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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="rzalydpconcepts.htm">Disk protection</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="rzalydpp.htm">Device parity protection</a></div>
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<div><a href="rzalyexamplegeomirror.htm">Example: Independent disk pools with geographic mirroring</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzalygeobenefits.htm">Benefits of geographic mirroring</a></div>
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<div><a href="rzalypoolthreshold.htm">Set the threshold of a disk pool</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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