58 lines
3.5 KiB
HTML
58 lines
3.5 KiB
HTML
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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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<meta name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Dynamic device allocation" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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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>Dynamic device allocation</title>
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</head>
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<body id="parallelsettingup"><a name="parallelsettingup"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Dynamic device allocation</h1>
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<div><p>Dynamic device allocation allows you to allocate tape devices as they are
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needed. </p>
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<p>There are three ways to allocate your tape devices.</p>
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<ul><li>All tape devices needed for the save operation are allocated in the beginning.</li>
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<li>Only one tape device is allocated at the beginning of a save operation.
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The maximum number of devices are allocated when data is ready to be written.</li>
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<li>The number of devices specified for the minimum parallel device resources
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field is allocated at the beginning of a save operation. Additional devices are
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allocated when data is ready to be written.</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> Use the <a href="../apis/qsrcrtmd.htm">Create Media
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Definition</a> API to specify your preferred value.</div>
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<div class="section"><img src="./delta.gif" alt="Start of change" /><h4 class="sectiontitle">Dynamic tape allocation restrictions</h4><ul><li>Initially all of the save operations will continue to allocate at least
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one device. Any operation that does not use a media definition will allocate
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its device at the beginning of the operation.</li>
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<li>Devices will not be dynamically deallocated.</li>
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<li>The dynamically allocated devices will be limited to these points in time<ul><li>After a save-while-active checkpoint.</li>
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<li>When the initial library data is ready to be written to an available device.</li>
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</ul>
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</li>
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</ul>
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<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="rzaiurzaiuparandcon.htm" title="Use these save methods to decrease your save window by saving to multiple devices.">Save to multiple devices to reduce your save window</a></div>
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