65 lines
5.0 KiB
HTML
65 lines
5.0 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Cluster partition" />
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<meta name="abstract" content="A cluster partition is a subset of the active cluster nodes that results from a communications failure. Members of a partition maintain connectivity with each other." />
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<meta name="description" content="A cluster partition is a subset of the active cluster nodes that results from a communications failure. Members of a partition maintain connectivity with each other." />
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<meta name="DC.Relation" scheme="URI" content="rzaigtroubleshootpartitionerrors.htm" />
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<title>Cluster partition</title>
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</head>
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<body id="rzaigconceptpartition"><a name="rzaigconceptpartition"><!-- --></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">Cluster partition</h1>
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<div><p>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.</p>
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<p>A cluster partition occurs in a cluster whenever communication is lost
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between one or more nodes in the cluster and a failure of the lost nodes cannot
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be confirmed. When a cluster partition condition is detected, cluster resource
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services limits the types of actions that you can perform on the nodes in
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the cluster partition. Restricting function during a partition is done so
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cluster resource services will be able to merge the partitions once the problem
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that caused it has been fixed.</p>
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<p><img src="./delta.gif" alt="Start of change" />Certain CRG operations are restricted when
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a cluster is partitioned. For details on which operations are restricted for
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each type of partition, see <a href="../apis/clust3a1TOC.htm">Cluster Resource Group APIs</a>.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />If a cluster administrative domain is partitioned, changes
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will continue to be synchronized among the active nodes in each partition.
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When the nodes are merged back together again, the cluster administrative
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domain will propagate all changes made in every partition so that the resources
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are consistent within the active domain.<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> <img src="./delta.gif" alt="Start of change" /><a href="rzaigconceptsevents.htm" title="Within a cluster several types events, actions, and services can occur.">Cluster events</a><img src="./deltaend.gif" alt="End of change" /></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="rzaigplanavoidclusterpartition.htm" title="The typical network-related cluster partition can best be avoided by configuring redundant communications paths between all nodes in the cluster.">Avoid a cluster partition</a></div>
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<div><a href="rzaigtroubleshootpartitionerrors.htm" title="Certain cluster conditions are easily corrected. If a cluster partition has occurred, you can learn how to recover. This topic also tells you how to avoid a cluster partition and gives you an example of how to merge partitions back together.">Partition errors</a></div>
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<div><a href="rzaigplanhardware.htm" title="Any iSeries model that is capable of running i5/OS V4R4M0 or later is compatible for using clustering.">Hardware requirements for clusters</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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