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109 lines
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<meta name="DC.Title" content="Cluster version" />
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<title>Cluster version</title>
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<body id="rzaigplanclusterversions"><a name="rzaigplanclusterversions"><!-- --></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 version</h1>
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<div><p>A <dfn class="term">cluster version</dfn> represents the level of function
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available on the cluster.</p>
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<p>Versioning is a technique that allows the cluster to contain systems at
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multiple release levels and fully interoperate by determining the communications
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protocol level to be used. If you are using a cluster that will contain systems
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of varying release levels, see Multiple-release clusters.</p>
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<p>There are actually two cluster versions:</p>
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<dl><dt class="dlterm">Potential cluster version</dt>
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<dd>Represents the most advanced level of cluster function available for a
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given node. This is the version at which the node is capable of communicating
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with the other cluster nodes.</dd>
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<dt class="dlterm">Current cluster version</dt>
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<dd>Represents the version currently being used for all cluster operations.
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This is the version of communications between the nodes in the cluster.</dd>
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</dl>
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<p>The potential cluster version is incremented on every operating system
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release which has significant new clustering functionality not available in
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earlier cluster versions. If the current cluster version is less than the
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potential cluster version, then that function cannot be used since some nodes
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cannot recognize or process the request. To take advantage of such new function,
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every system in the cluster needs to be at the same potential cluster version
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and the current cluster version must also be set to that level.</p>
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<p>When a node attempts to join a cluster, its potential cluster version is
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compared against the current cluster version. If the value of the potential
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cluster version is not the same as current (N) or not equal to the next version
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level (N+1), then the node is not allowed to join the cluster. Note that the
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current cluster version is initially set by the first node defined in the
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cluster using the value specified on the create cluster API or command. </p>
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<p><img src="./delta.gif" alt="Start of change" />For example if you want V5R3 nodes to exist with V5R4 nodes
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you can do one of the following:<img src="./deltaend.gif" alt="End of change" /></p>
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<ul><li><img src="./delta.gif" alt="Start of change" />Create the cluster on a V5R3 system and add in the V5R4
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node.<img src="./deltaend.gif" alt="End of change" /></li>
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<li><img src="./delta.gif" alt="Start of change" />Create the cluster on a V5R4 system specifying to allow
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previous nodes to be added to the cluster, then add V5R3 systems to the cluster.<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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<p>In a multiple-release cluster, cluster protocols will always be run at
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the lowest node release level, the current cluster version. This is defined
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when the cluster is first created. N can either be set to the potential node
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version running on the node that originated the create cluster request or
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one cluster version previous to the originators potential node version. Nodes
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in the cluster can differ by at most one cluster version level.</p>
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<p> Once all systems in the cluster have been upgraded to the next release,
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the cluster version can be upgraded so that new functions are available. This
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can be accomplished by adjusting the cluster version. </p>
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<div class="attention"><span class="attentiontitle">Attention:</span> If the new version of the operating system is not equal
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or one version higher to the current cluster version, then the cluster node
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will fail when it is restarted. To recover from this situation, the node must
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be deleted and recreated with the correct version. </div>
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<div class="attention"><span class="attentiontitle">Attention:</span> <img src="./delta.gif" alt="Start of change" />When you are using switchable independent
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disk pools in your cluster, there are restrictions in performing switchover
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between releases. You need to switch a previous release independent disk pool
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to a system running the current release of i5/OS™ and make it available. After it is
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made available on the system running the current release of i5/OS,
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its internal contents are changed and it cannot be made available to the previous
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release system again. <img src="./deltaend.gif" alt="End of change" /></div>
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<p>Read more on <a href="../apis/clust1a6.htm">cluster
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versions</a> in the Cluster APIs documentation, including information about
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restrictions and how cluster versions correspond to <span class="keyword">i5/OS</span> releases.</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="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="rzaigplanmixedrelease.htm" title="If creating a cluster that will include nodes at multiple cluster versions, then certain steps are required when you create the cluster.">Multiple-release clusters</a></div>
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<div><a href="rzaigtroubleshootcommonproblems.htm" title="Lists some of the most common problems that can occur in a cluster, as well as ways to avoid and recover from them.">Common cluster problems</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="rzaigconfigcreatecluster.htm" title="To create and configure a cluster, you need to include at least one node in the cluster and you must have access to at least one of the nodes that will be in the cluster.">Create a cluster</a></div>
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<div><a href="rzaigmanageadjustclusterversion.htm" title="The cluster version defines the level at which all the nodes in the cluster are actively communicating with each other.">Adjust the cluster version of a cluster</a></div>
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</div>
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</div>
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