77 lines
4.9 KiB
HTML
77 lines
4.9 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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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="concept" />
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<meta name="DC.Title" content="i5/OS architecture for cluster-enabled applications" />
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<meta name="abstract" content="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." />
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<meta name="description" content="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." />
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<meta name="DC.Relation" scheme="URI" content="rzaigapplications.htm" />
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<meta name="DC.Relation" scheme="URI" content="http://www-1.ibm.com/servers/eserver/iseries/ha/" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaigapplicationsclusterproven" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>i5/OS architecture
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for cluster-enabled applications</title>
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</head>
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<body id="rzaigapplicationsclusterproven"><a name="rzaigapplicationsclusterproven"><!-- --></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"><span class="keyword">i5/OS</span> architecture
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for cluster-enabled applications</h1>
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<div><p>Additional end-user value is provided by any application that is
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highly available, recognizing applications that continue to be available in
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the event of an outage, planned or unplanned.</p>
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<p><span class="keyword">i5/OS™</span> has provided an
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application resilience architecture that supports various degrees of highly
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available application. At the high end of this spectrum applications will
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be enhanced with integrated functions that demonstrate highly available characteristics
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and automation of the highly available environment, controlled by cluster
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management utilities.</p>
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<p>These applications have the following characteristics:</p>
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<ul><li>The application can switch over to a backup cluster node when the primary
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node becomes unavailable.</li>
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<li>The application defines the resilient environment in the Resilient Definition
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and Status Data Area to enable automatic configuration and activation of the
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application by a cluster management application.</li>
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<li>The application provides application resilience by means of an application
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CRG exit program to handle cluster related events, taking advantage of the
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capabilities of the <span class="keyword">i5/OS</span> cluster
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resource services.</li>
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<li>The application provides an application restart function that repositions
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the user to an application menu screen or beyond.</li>
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</ul>
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<p>Applications that demonstrate more stringent availability and restart characteristics
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have the following characteristics:</p>
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<ul><li>The application provides enhanced application resilience through more
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robust handling of cluster events (action codes) by the application CRG exit
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program.</li>
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<li>The application provides a greater level of application restart support.
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For host-centric applications, the user will be repositioned to a transaction
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boundary by commitment control or checkpoint functions. For client-centric
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applications, the user will experience a seamless failover with minimal service
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interruption.</li>
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</ul>
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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="rzaigapplications.htm" title="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.">Cluster applications</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="http://www-1.ibm.com/servers/eserver/iseries/ha/">iSeries High Availability and 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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