116 lines
6.2 KiB
HTML
116 lines
6.2 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: Rejoin" />
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<meta name="abstract" content="This topic describes the actions that can occur when a node rejoins a cluster." />
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<meta name="description" content="This topic describes the actions that can occur when a node rejoins a cluster." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsrejoin.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="rzaigconceptsrejoinexample" />
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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>Example: Rejoin</title>
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</head>
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<body id="rzaigconceptsrejoinexample"><a name="rzaigconceptsrejoinexample"><!-- --></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: Rejoin</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />This topic describes the actions
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that can occur when a node rejoins a cluster.<img src="./deltaend.gif" alt="End of change" /></span></p>
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<p>The following diagram describes the actions taken whenever a node rejoins
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the cluster. In addition, the state of the rejoining nodes will be changed
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from <var class="varname">inactive</var> to <var class="varname">active</var> in the membership
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status field in the recovery domain of the CRG. The exit program is called
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on all nodes in the CRG's recovery domain and is passed an action code of
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Rejoin.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Rejoin operation</caption><thead align="left"><tr><th colspan="4" align="center" valign="top" id="d0e31">Rejoin operation</th>
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</tr>
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</thead>
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<tbody><tr><td colspan="2" align="center" valign="top" headers="d0e31 ">Rejoining node</td>
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<td colspan="2" align="center" valign="top" headers="d0e31 ">Cluster nodes</td>
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</tr>
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<tr><td valign="top" headers="d0e31 ">Contains copy of CRG</td>
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<td valign="top" headers="d0e31 ">Does not contain copy of CRG</td>
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<td valign="top" headers="d0e31 ">Contain copy of CRG</td>
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<td valign="top" headers="d0e31 ">Do not contain copy of CRG</td>
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</tr>
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<tr><td align="center" valign="top" headers="d0e31 ">(1)</td>
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<td align="center" valign="top" headers="d0e31 ">(2)</td>
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<td align="center" valign="top" headers="d0e31 ">(3)</td>
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<td align="center" valign="top" headers="d0e31 ">(4)</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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<p>Using the diagram above, the following situations are possible:</p>
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<ol><li>1 and 3</li>
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<li>1 and 4</li>
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<li>2 and 3</li>
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<li>2 and 4</li>
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</ol>
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<p>If a node in the cluster has a copy of the CRG, the general rule for rejoin
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is that the CRG is copied from an active node in the cluster to the rejoining
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node.</p>
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<dl><dt class="dlterm">Rejoin Situation 1</dt>
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<dd>A copy of the CRG object from a node in the cluster is sent to the joining
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node. The result is: <ul><li>The CRG object is updated on the joining node with the data sent from
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the cluster.</li>
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<li>The CRG object may be deleted from the joining node. This can occur if
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the joining node was removed from the CRG's recovery domain while the joining
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node was out of the cluster.</li>
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</ul>
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</dd>
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<dt class="dlterm">Rejoin Situation 2</dt>
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<dd>A copy of the CRG object from the joining node is sent to all cluster
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nodes. The result is: <ul><li>No change if none of the cluster nodes are in the CRG's recovery domain.</li>
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<li>The CRG object may be created on one or more of the cluster nodes. This
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can occur in the following scenario: <ul><li>Nodes A, B, C, and D make up a cluster.</li>
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<li>All four nodes are in the recovery domain of the CRG.</li>
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<li>While node A is out of the cluster, the CRG is modified to remove B from
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the recovery domain.</li>
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<li>Nodes C and D fail.</li>
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<li>The cluster is only node B which does not have a copy of the CRG.</li>
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<li>Node A rejoins the cluster.</li>
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<li>Node A has the CRG (although it is down level by now) and Node B does
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not. The CRG is created on node B. When nodes C and D rejoin the cluster,
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the copy of the CRG in the cluster updates node C and D and the previous change
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to remove node B from the recovery domain is lost.</li>
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</ul>
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</li>
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</ul>
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</dd>
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<dt class="dlterm">Rejoin Situation 3</dt>
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<dd>A copy of the CRG object from a node in the cluster is sent to the joining
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node. The result is: <ul><li>No change if the joining node is not in the CRG's recovery domain.</li>
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<li>The CRG object may be created on the joining node. This can occur if the
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CRG was deleted on the joining node while cluster resource services is not
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active on the node.</li>
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</ul>
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</dd>
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<dt class="dlterm">Rejoin Situation 4</dt>
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<dd>Some internal information from one of the nodes in the cluster may be
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used to update information about the joining node but nothing occurs that is
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visible to you.</dd>
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</dl>
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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> <img src="./delta.gif" alt="Start of change" /><a href="rzaigconceptsrejoin.htm" title="Rejoin means to become an active member of a cluster after having been a nonparticipating member.">Rejoin</a><img src="./deltaend.gif" alt="End of change" /></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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