86 lines
6.3 KiB
HTML
86 lines
6.3 KiB
HTML
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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Cluster applications" />
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<meta name="abstract" content="Application resilience is one of the key elements in a clustered environment. If you are planning to write and use highly available applications in your cluster you should be aware that these applications have specific availability specifications." />
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<meta name="description" content="Application resilience is one of the key elements in a clustered environment. If you are planning to write and use highly available applications in your cluster you should be aware that these applications have specific availability specifications." />
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<meta name="DC.Relation" scheme="URI" content="rzaigapplicationsclusterproven.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigapplicationswritehighlyavailable.htm" />
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<title>Cluster applications</title>
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</head>
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<body id="rzaigapplications"><a name="rzaigapplications"><!-- --></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 applications</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />Application resilience is one of the key elements
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in a clustered environment. If you are planning to write and use highly
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available applications in your cluster you should be aware that these applications
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have specific availability specifications. <img src="./deltaend.gif" alt="End of change" /></span></p>
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<div class="section"><p>By taking advantage of resilient applications in your cluster,
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an application can be restarted on a different cluster node without requiring
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you to reconfigure the clients. In addition, the data that is associated with
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the application will be available after switchover or failover. This means
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that the application user can experience minimal, or even seamless, interruption
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while the application and its data switch from the primary node to the backup
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node. The user does not need to know that the application and data have moved
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on the back end.</p>
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<p><img src="./delta.gif" alt="Start of change" />In order to achieve application resiliency
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in your cluster, applications that meet certain availability specifications
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must be used. Certain characteristics must be present in the application in
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order for it to be switchable, and therefore always available to the users
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of the application in the cluster. See <a href="http://www-03.ibm.com/servers/eserver/iseries/ha/" target="_blank">High Availability and Clusters </a> for details on these
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application traits. Because these requirements exist, you have the following
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options for using a switchable application in your cluster:<img src="./deltaend.gif" alt="End of change" /></p>
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</div>
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<ol><li class="stepexpand"><span><span class="uicontrol">Purchase a cluster-enabled software application</span></span> <p>Software products that are cluster-enabled meet certain high-availability
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requirements.</p>
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</li>
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<li class="stepexpand"><span><span class="uicontrol">Write or change your own application to make it highly
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available</span> </span> <p>Independent software vendors and application
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programmers can customize applications to allow them to be switchable in an iSeries™ clustered
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environment.</p>
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</li>
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</ol>
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<div class="section"><p>Once you have a resilient application, it must be managed within
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your cluster.</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="rzaigapplicationsclusterproven.htm">i5/OS architecture for cluster-enabled applications</a></strong><br />
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Additional end-user value is provided by any application that is highly available, recognizing applications that continue to be available in the event of an outage, planned or unplanned.</li>
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<li class="ulchildlink"><strong><a href="rzaigapplicationswritehighlyavailable.htm">Writing a highly available cluster application</a></strong><br />
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A highly available application is one that can be resilient to a system outage in a clustered environment.</li>
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<li class="ulchildlink"><strong><a href="rzaigapplicationscrg.htm">Application CRG considerations</a></strong><br />
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An application cluster resource group manages application resiliency.</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 class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaigconceptsresilientapplications.htm" title="A resilient application is an application that can be restarted on a different cluster node without requiring you to reconfigure the clients.">Resilient applications</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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