58 lines
3.5 KiB
HTML
58 lines
3.5 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 name="Robots" content="index,follow" />
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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="topic" />
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<meta name="DC.Title" content="Dynamic device allocation" />
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<meta name="DC.Relation" scheme="URI" content="rzaiurzaiuparandcon.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="parallelsettingup" />
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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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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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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>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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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html>
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