76 lines
5.8 KiB
HTML
76 lines
5.8 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Availability for multiple systems: Clusters" />
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<meta name="abstract" content="For multiple system environments, you can use clusters as a strategy to maintain a high or continuous availability for your systems and applications." />
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<meta name="description" content="For multiple system environments, you can use clusters as a strategy to maintain a high or continuous availability for your systems and applications." />
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<meta name="DC.Relation" scheme="URI" content="rzalwoverview.htm" />
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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="rzalwclusters" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Availability for multiple systems: Clusters</title>
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</head>
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<body id="rzalwclusters"><a name="rzalwclusters"><!-- --></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">Availability for multiple systems: Clusters</h1>
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<div><p>For multiple system environments, you can use clusters as a strategy
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to maintain a high or continuous availability for your systems and applications.</p>
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<p> A <dfn class="term">cluster</dfn> is a collection or group of multiple systems that
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work together as a single server. If your business needs high or continuous
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availability, clustering is the solution that you should consider.</p>
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<p>Systems in a cluster work cooperatively to provide a single computing solution.
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You can have up to 128 systems in a cluster. This allows you to efficiently
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group your systems together to set up an environment that provides availability
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that approaches 100 percent for your critical applications and data. This
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helps ensure that your essential systems and applications are always available.
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Clusters also provide simplified systems management and increased scalability
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to seamlessly add new components as your business grows.</p>
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<p>You have to weigh the cost of this solution against the cost of downtime
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on your system to decide whether to implement clusters in your business. </p>
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<p>If you do choose to use clusters in your environment, you will have the
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added benefit of improving application availability. The level of application
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availability will depend on how well the application integrates with cluster
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resource services. For more information on these applications, see <a href="#rzalwclusters__application">Highly available programs</a>.</p>
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<p>To learn more about clusters, including how it works and how to implement
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clusters in your business, see <a href="../rzaig/rzaigicclust.htm">Clusters</a>.
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For more information on clusters in the context of other high availability
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solutions, see <a href="http://www.ibm.com/servers/eserver/iseries/ha/" target="_blank">High availability and clusters</a> <img src="www.gif" alt="Link outside Information Center" />.</p>
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<div class="section" id="rzalwclusters__application"><a name="rzalwclusters__application"><!-- --></a><h4 class="sectiontitle"> Highly available programs </h4><p>Highly
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available applications provide users continued access to data and application
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functions despite planned or unplanned outages. i5/OS™ has provided an application resilience
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architecture that supports various degrees of highly available application.
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Applications at the high end of the availability spectrum are enhanced with
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integrated functions and provide automation of the environment. These functions
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are controlled by cluster management utilities. For more information on these
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topics, see <a href="../rzaig/rzaigapplications.htm">Cluster
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applications</a>.</p>
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</div>
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<div class="section"><img src="./delta.gif" alt="Start of change" /><h4 class="sectiontitle">iSeries™ cluster middleware</h4>iSeries cluster
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middleware is a group of competitive third party products which provide cluster
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management and data replication functions and services. These products make
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full use of the Cluster Resource Services functions of i5/OS and adhere to
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the iSeries cluster architecture. For a list of cluster middleware and a description
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of the criteria these programs must meet, see <a href="http://www-1.ibm.com/servers/eserver/iseries/ha/haclustermiddleware.htm" target="_blank">High Availability and Clusters</a>.<img src="www.gif" alt="Link outside Information Center" /><img src="./deltaend.gif" alt="End of change" /></div>
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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="rzalwoverview.htm" title="In today's fast-paced Internet environment, it is crucial that your data and applications be available to you when you need them. If your customers cannot access your Web site because your system is down, they may go to your competitors instead.">Availability roadmap</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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