71 lines
4.0 KiB
HTML
71 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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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="Example: Independent disk pools with geographic mirroring" />
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<meta name="DC.Relation" scheme="URI" content="rzaigscenarios.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rzalyexamplegeomirror" />
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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>Example: Independent disk pools with geographic mirroring</title>
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</head>
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<body id="rzalyexamplegeomirror"><a name="rzalyexamplegeomirror"><!-- --></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">Example: Independent disk pools with geographic mirroring</h1>
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<div><div class="fignone"><p>The following example shows one way that geographic mirroring can be configured.
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Node A and Node B are located in New York City. Node C and Node D are located
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in Boston. All four nodes are configured in the same recovery domain. The
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production copy can be switched between nodes A and B. The mirror copy can
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be switched between nodes C and D. Because all of the nodes are in the same
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recovery domain, the source system in New York can also exchange roles with
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the target system in Boston, allowing Boston to host the production copy.</p>
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<img src="rzaly507.gif" alt="Geographic mirroring for an independent disk pool between New York City and Boston" /><div class="p">This company has defined the following roles for the nodes in the recovery
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domain:
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e25">Node</th>
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<th valign="top" id="d0e27">Role</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e25 ">Node A</td>
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<td valign="top" headers="d0e27 ">Primary</td>
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</tr>
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<tr><td valign="top" headers="d0e25 ">Node B</td>
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<td valign="top" headers="d0e27 ">Backup 1</td>
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</tr>
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<tr><td valign="top" headers="d0e25 ">Node C</td>
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<td valign="top" headers="d0e27 ">Backup 2</td>
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</tr>
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<tr><td valign="top" headers="d0e25 ">Node D</td>
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<td valign="top" headers="d0e27 ">Backup 3</td>
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</tr>
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</tbody>
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</table>
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</div>
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In the event of a natural disaster in New York, Node C in Boston becomes
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the primary node by upgrading its mirror copy to a production copy. Node C
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becomes the source system for geographic mirroring, although geographic mirroring
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will be suspended because there is no target node because of the natural disaster
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in New York. When the New York site recovers, Node A becomes a backup node
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and its previous production copy becomes the mirror copy.</div>
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</div>
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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="rzaigscenarios.htm" title="Use these examples of typical cluster implementations to understand when, why, and how using clusters can be beneficial.">Examples: Cluster configurations</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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