55 lines
3.5 KiB
HTML
55 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 name="Robots" content="index,follow" />
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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="concept" />
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<meta name="DC.Title" content="Plan for switchable independent disk pools and cross-site mirroring (XSM)" />
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<meta name="abstract" content="A single copy of the data is maintained on switchable hardware; either an expansion unit (tower) or an IOP in a logical partition environment." />
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<meta name="description" content="A single copy of the data is maintained on switchable hardware; either an expansion unit (tower) or an IOP in a logical partition environment." />
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<meta name="DC.Relation" scheme="URI" content="rzaigplandataresilience.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rzaly/rzalyplan.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaigplanswitcheddisks" />
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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>Plan for switchable independent disk pools and cross-site mirroring
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(XSM)</title>
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</head>
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<body id="rzaigplanswitcheddisks"><a name="rzaigplanswitcheddisks"><!-- --></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">Plan for switchable independent disk pools and cross-site mirroring
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(XSM)</h1>
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<div><p>A single copy of the data is maintained on switchable hardware;
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either an expansion unit (tower) or an IOP in a logical partition environment.</p>
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<p>When an outage occurs on the primary node, access to the data on the switchable
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hardware switches to a designated backup node. Additionally, independent disk
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pools can be used in a cross-site mirroring (XSM) environment. This allows
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a mirror copy of the independent disk pool to be maintained on a system that
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is (optionally) geographically distant from the originating site for availability
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or protection purposes.</p>
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<p>Careful planning is required if you plan to take advantage of switchable
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resources residing on switchable independent disk pools or cross-site mirroring
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(XSM).</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="rzaigplandataresilience.htm" title="Data resilience is achieved when data is always available to an user or application. You can achieve data resilience through the use of logical replication or switchable independent disk pools.">Plan for data resilience</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="../rzaly/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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