58 lines
4.1 KiB
HTML
58 lines
4.1 KiB
HTML
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<meta name="DC.Title" content="Auxiliary storage pools" />
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<meta name="abstract" content="An auxiliary storage pool (ASP) is one or more physical disk units assigned to the same storage area. ASPs allow you to isolate certain types of objects on specified physical disk units." />
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<meta name="DC.subject" content="database recovery, auxiliary storage pool (ASP), recovery, ASP (auxiliary storage pool), disk failure, auxiliary storage pool (ASP)" />
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<meta name="keywords" content="database recovery, auxiliary storage pool (ASP), recovery, ASP (auxiliary storage pool), disk failure, auxiliary storage pool (ASP)" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Auxiliary storage pools</title>
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</head>
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<body id="rbal1auxstore"><a name="rbal1auxstore"><!-- --></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">Auxiliary storage pools</h1>
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<div><p>An auxiliary storage pool (ASP) is one or more physical disk units
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assigned to the same storage area. ASPs allow you to isolate certain types
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of objects on specified physical disk units.</p>
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<div class="section"><p>The server ASP isolates server programs and the temporary objects
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that are created as a result of processing by server programs. User ASPs can
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be used to isolate some objects such as libraries, SQL objects, journals,
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journal receivers, applications, and data. The <span class="keyword">iSeries™ server</span> supports
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up to 32 basic user ASPs, and 223 independent user ASPs. Isolating libraries
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or objects in a user ASP protects them from disk failures in other ASPs and
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reduces recovery time.</p>
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</div>
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<div class="section"><p>In addition to reduced recovery time and isolation of objects,
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placing objects in an ASP can improve performance. If a journal receiver is
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isolated in a user ASP, the disks associated with that ASP are dedicated to
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that receiver. In an environment that requires many read and
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write operations to the database files, this can reduce arm contention on
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the disks in that ASP, and can improve journaling performance.</p>
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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="rbal1datarecov.htm" title="Recovery is not possible for recently entered data if a disk failure occurs and all objects are not saved on tape or disk immediately before the failure. After previously saved objects are restored, the server is operational, but the database is not current.">Data recovery after disk failures for distributed relational databases</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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