83 lines
5.7 KiB
HTML
83 lines
5.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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 name="DC.Type" content="task" />
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<meta name="DC.Title" content="Resilient resources" />
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<meta name="abstract" content="Resilient resources are system resources, such as data, devices and applications, that are highly available if you have used clustering on your systems." />
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<meta name="description" content="Resilient resources are system resources, such as data, devices and applications, that are highly available if you have used clustering on your systems." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptselements.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsresilientapplications.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsresilientdata.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsresilientdevices.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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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>Resilient resources</title>
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</head>
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<body id="rzaigconceptsresilientresources"><a name="rzaigconceptsresilientresources"><!-- --></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">Resilient resources</h1>
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<div><p><dfn class="term">Resilient resources</dfn> are system resources, such as
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data, devices and applications, that are highly available if you have used
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clustering on your systems.</p>
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<div class="section"><p>If a cluster node that is the primary access point for a particular
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set of resilient resources in the cluster should incur an outage, another
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cluster node that is defined as the backup for that set of resources now becomes
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the access point.</p>
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<p>The types of system resources that can be resilient
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are:</p>
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</div>
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<ol><li><span>Data being replicated between nodes.</span></li>
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<li><span>Applications using an IP address, which can be switched from one
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node to another.</span></li>
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<li><span>Hardware devices which can be switched from one node to another.</span></li>
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<li><img src="./delta.gif" alt="Start of change" /><span>Peer resources that are supported by a cluster administrative
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domain.</span><img src="./deltaend.gif" alt="End of change" /></li>
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</ol>
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<div class="section"><p>The definition of the relationship between the nodes that are associated
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with a set of resilient resources is found in the <dfn class="term">cluster resource group
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(CRG)</dfn> object. Cluster resource groups are replicated and coordinated
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across the nodes in the cluster through cluster resource services.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzaigconceptsresilientapplications.htm">Resilient applications</a></strong><br />
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A <dfn class="term">resilient application</dfn> is an application
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that can be restarted on a different cluster node without requiring you to
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reconfigure the clients.</li>
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<li class="ulchildlink"><strong><a href="rzaigconceptsresilientdata.htm">Resilient data</a></strong><br />
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<dfn class="term">Resilient data </dfn> is data that is replicated
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(copied) on more than one node in a cluster.</li>
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<li class="ulchildlink"><strong><a href="rzaigconceptsresilientdevices.htm">Resilient devices</a></strong><br />
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<dfn class="term">Resilient devices</dfn> are physical resources, represented
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by a configuration object, such as a device description, that are accessible
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from more than one node in a cluster.</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="rzaigconceptselements.htm" title="An iSeries cluster is a collection of one or more systems or partitions that work together as a single system. Use this information to understand the elements and their relationship to each other.">The elements of a cluster</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="rzaigconceptscrg.htm" title="A cluster resource group (CRG) is an i5/OS system object that is a set or grouping of cluster resources that are used to manage events that occur in a clustered environment. The cluster resource group describes a recovery domain and supplies the name of the cluster resource group exit program which gets called when certain cluster events occur.">Cluster resource group</a></div>
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<div><a href="rzaigconceptsclusteradmindmn.htm" title="A cluster administrative domain is used to manage resources that need to be maintained consistently across the nodes in a clustered environment.">Cluster administrative domain</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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