67 lines
5.7 KiB
HTML
67 lines
5.7 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="How a cluster works" />
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<meta name="abstract" content="The cluster infrastructure provided as a part of i5/OS, called cluster resource services, provides resiliency for your critical resources. These resources can include data, applications, devices, and other resources accessed by multiple clients." />
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<title>How a cluster works</title>
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<body id="rzaigconceptshowclusterworks"><a name="rzaigconceptshowclusterworks"><!-- --></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">How a cluster works</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />The cluster infrastructure provided as a part
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of <span class="keyword">i5/OS™</span>, called cluster
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resource services, provides resiliency for your critical resources. These
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resources can include data, applications, devices, and other resources accessed
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by multiple clients. <img src="./deltaend.gif" alt="End of change" /></span></p>
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<p><img src="./delta.gif" alt="Start of change" />If a system outage or a site loss occurs, the functions
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that are provided on a system within a cluster can be accessed through other
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systems that have been defined in the cluster. There are two models in which
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this data can be accessed: primary-backup model and peer model. For more details
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on cluster resource groups (CRGs) that you can create based on these models,
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see <a href="rzaigconceptscrg.htm">Cluster resource group</a>. <img src="./deltaend.gif" alt="End of change" /></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="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 class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaigconceptsfailover.htm" title="Failover occurs when a server in a cluster automatically switches over to one or more backup servers in the event of a system failure.">Failover</a></div>
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<div><a href="rzaigconceptsreplication.htm" title="Replication makes a copy of something in real time. It means copying objects from one node in a cluster to one or more other nodes in the cluster.">Replication</a></div>
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<div><a href="rzaigconceptsresilientdevices.htm" title="Resilient devices are physical resources, represented by a configuration object, such as a device description, that are accessible from more than one node in a cluster.">Resilient devices</a></div>
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<div><a href="rzaigconceptsresilientdata.htm" title="Resilient data is data that is replicated (copied) on more than one node in a cluster.">Resilient data</a></div>
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<div><a href="rzaigconceptsrejoin.htm" title="Rejoin means to become an active member of a cluster after having been a nonparticipating member.">Rejoin</a></div>
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<div><a href="rzaigconceptsreplicationvsswitchable.htm" title="This topic provides an overview of different data resilience technologies that can be used with clusters to enhance high availability.">Comparison of logical replication, switched disks, and cross-site mirroring</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaigconceptsswitchover.htm" title="Switchover happens when you manually switch access to a resource from one server to another.">Switchover</a></div>
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</div>
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</div>
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</body>
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