64 lines
3.5 KiB
HTML
64 lines
3.5 KiB
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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<meta name="DC.Title" content="Determine the extra hardware needed for performance" />
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<title>Determine the extra hardware needed for performance</title>
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</head>
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<body id="hdrmirror5"><a name="hdrmirror5"><!-- --></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">Determine the extra hardware needed for performance</h1>
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<div><p>Mirrored protection normally requires additional disk units and input/output
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processors. However, in some cases, you might need additional hardware to
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achieve the level of performance that you want.</p>
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<p>Use the following information to decide how much extra hardware you might
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need:</p>
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<div class="section"><h4 class="sectiontitle">Processing unit requirements</h4><p>Mirrored protection
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causes a minor increase in central processing unit usage (approximately 1%
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to 2%).</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Main storage requirements</h4><p>If you have mirrored protection,
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you need to increase the size of your machine pool. Mirrored protection requires
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storage in the machine pool for general purposes and for each mirrored pair.
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You should expect to increase your machine pool by approximately 12 KB for
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each 1 GB of mirrored disk storage (12 KB for 1 GB disk units, 24 KB for 2
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GB disk units, and so forth).</p>
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<p>During synchronization, mirrored protection
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uses an additional 512 KB of memory for each mirrored pair that is being synchronized.
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The system uses the pool with the most storage.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">I/O processor requirements</h4><p>To maintain equivalent
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performance after starting mirrored protection, your system should have the
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same ratio of disk units to I/O processors as it did before. To add I/O processors,
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you might need to upgrade your system for additional buses.</p>
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<p>Because
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of the limit on buses and I/O processors, you might not be able to maintain
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the same ratio of disk units to I/O processors. In this case, system performance
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might be less.</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="rzalymirrorplan.htm">Plan for mirrored protection</a></div>
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</div>
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</div>
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</body>
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