85 lines
6.6 KiB
HTML
85 lines
6.6 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="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="Cluster events" />
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<meta name="abstract" content="Within a cluster several types events, actions, and services can occur." />
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<meta name="description" content="Within a cluster several types events, actions, and services can occur." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconcepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsfailover.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsswitchover.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsrejoin.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsmerge.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsreplication.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsheartbeatmonitor.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsreliablemessagefunction.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigmanagechangecrsssettings.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptpartition.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="rzaigconceptsevents" />
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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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<!-- 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>Cluster events</title>
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</head>
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<body id="rzaigconceptsevents"><a name="rzaigconceptsevents"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Cluster events</h1>
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<div><p>Within a cluster several types events, actions, and services can
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occur.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsfailover.htm">Failover</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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<dfn class="term">Failover</dfn> occurs when a server in a cluster
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automatically switches over to one or more backup servers in the event of
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a system failure.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsswitchover.htm">Switchover</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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<dfn class="term">Switchover</dfn> happens when you manually
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switch access to a resource from one server to another.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsrejoin.htm">Rejoin</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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<dfn class="term">Rejoin</dfn> means to become an active member of a cluster
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after having been a nonparticipating member.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsmerge.htm">Merge</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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A <dfn class="term">merge</dfn> operation is similar to a rejoin operation
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except that it occurs when nodes that are partitioned begin communicating
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again.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsreplication.htm">Replication</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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<dfn class="term">Replication</dfn><span class="uicontrol"></span> makes a copy of
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something in real time. It means copying objects from one node in a cluster
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to one or more other nodes in the cluster.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsheartbeatmonitor.htm">Heartbeat monitoring</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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<dfn class="term">Heartbeat monitoring</dfn> is a cluster resource services
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function that ensures that each node is active by sending a signal from every
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node in the cluster to every other node in the cluster to convey that they
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are still active.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptsreliablemessagefunction.htm">Reliable message function</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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The <dfn class="term">reliable message function</dfn> of cluster
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resource services keeps track of each node in a cluster and ensures that all
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nodes have consistent information about the state of cluster resources.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigmanagechangecrsssettings.htm">Change cluster resource services settings</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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The default values affecting message timeout and retry are set to account for most typical installations. However, it is possible to change these values to more closely match your communications environment.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzaigconceptpartition.htm">Cluster partition</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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A <dfn class="term">cluster partition</dfn> is a subset of the active cluster
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nodes that results from a communications failure. Members of a partition maintain
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connectivity with each other.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigconcepts.htm" title="Get a complete understanding of how clusters work. Read about the benefits of clusters and how they can be important to you, as well as information on important clustering concepts and how they fit together.">Cluster concepts</a></div>
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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html>
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