56 lines
2.9 KiB
HTML
56 lines
2.9 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="Benefits of device parity protection" />
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<meta name="DC.Relation" scheme="URI" content="rzalydpp.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="hdrdeviceparityben" />
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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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<!-- 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>Benefits of device parity protection</title>
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</head>
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<body id="hdrdeviceparityben"><a name="hdrdeviceparityben"><!-- --></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">Benefits of device parity protection</h1>
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<div><div class="section"><h4 class="sectiontitle">RAID 5</h4></div>
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<ul><li>Lost data is automatically reconstructed by the IOA after a disk failure.</li>
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<li>The system continues to run after a single disk failure.</li>
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<li>A failed disk unit can be replaced without stopping the system.</li>
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<li>Device parity protection reduces the potential number of
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objects that could be damaged when a disk fails.</li>
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<li>Only one disk unit of capacity stores parity data in a parity
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set.</li>
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</ul>
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<div class="section"><h4 class="sectiontitle">RAID 6</h4></div>
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<ul><li>Lost data is automatically reconstructed by the IOA after
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a disk failure.</li>
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<li>The system continues to run after two disks fail.</li>
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<li>Two failed disk units can be replaced without stopping the
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system.</li>
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<li>Device parity protection reduces the potential number of
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objects that could be damaged when a disk fails.</li>
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<li>Two disk units of capacity are dedicated to storing parity
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data in a parity set. </li>
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</ul>
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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="rzalydpp.htm">Device parity 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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