96 lines
5.6 KiB
HTML
96 lines
5.6 KiB
HTML
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<title>Benefits of independent disk pools</title>
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</head>
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<body id="rzalybenefits"><a name="rzalybenefits"><!-- --></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">Benefits of independent disk pools</h1>
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<div><p>There are two environments in which the use of independent disk pools can
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be beneficial: a multiple-system clustered environment and a single-system
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environment. </p>
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<div class="section"><h4 class="sectiontitle">Multiple-system clustered environment</h4>In a multiple-system
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clustered environment, where the servers are members of an iSeries™ cluster
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and an independent disk pool is associated with a switchable device in that
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cluster, independent disk pools can be switched between systems without having
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to perform an initial program load (IPL). The independent disk pool can be
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switched because the independent disk pool is self-contained. This can be
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a significant advantage because it allows for continuous availability of
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data, the primary benefit of independent disk pools. <div class="p">Switchable independent
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disk pools can help you do the following: <ul><li>Keep data available to an application even in the event of a single system
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outage, either scheduled or unscheduled.</li>
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<li>Eliminate the process of replicating data from one system to another.</li>
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<li>In some situations, isolate disk unit failures within the independent
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disk pool. </li>
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<li>Achieve high availability and scalability.</li>
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</ul>
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</div>
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<p>A multiple-system environment also gives you the opportunity
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to perform <a href="rzalygeographicmirror.htm">geographic mirroring</a>. Geographic mirroring allows you
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to maintain two identical copies of an independent disk pool at two sites
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that are geographically separated. By having a second copy of critical data
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at a remote location, you ensure greater protection and availability; for
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example, in the case of a natural disaster. If you configure the independent
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disk pools to be switchable, you increase your options to have more backup
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nodes to allow for failover and switchover of independent disk pools between
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systems at the same site, in addition to switchover and failover to a system
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at another site. </p>
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</div>
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<div class="section"><h4 class="sectiontitle">Single-system environment</h4>In a single-system environment,
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where an independent disk pool is privately connected to a single server,
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independent disk pool or independent disk pool groups can be made unavailable,
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independent of other disk pools because the data in the independent disk
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pool or independent disk pool group is self-contained. The independent disk
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pool or independent disk pool group can also be made available, while the
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system is active, without having to perform an IPL. Using independent disk
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pools this way can be useful, for example, if you have large amounts of data
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that are not needed for normal day-to-day processing. The independent disk
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pool containing this data can be left offline until it is needed. When large
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amounts of storage are normally kept offline, you can shorten processing
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time for operations such as IPL and reclaim storage. <div class="p">Single-system independent
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disk pools can help you do the following:<ul><li>Isolate low-use data with the ability to bring the independent disk pool
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online only when it is needed.</li>
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<li>Reduce system start time.</li>
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<li>Manage save and restore by independent disk pool.</li>
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<li>Reclaim storage by independent disk pool.</li>
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<li>Divide data between multiple databases.</li>
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<li>Isolate data associated with specific applications or associated with
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specific groups of users.</li>
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<li>Consolidate data on small systems to independent disk pools
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on a larger system. For example, in the case of multiple branch offices.</li>
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<li>Perform application maintenance that does not affect the entire system.</li>
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</ul>
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</div>
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</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="rzalyconcepts.htm">Independent disk pools</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzalyaspsben.htm">Disk pool benefits</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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