95 lines
5.7 KiB
HTML
95 lines
5.7 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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<meta name="DC.Title" content="Save to multiple devices to reduce your save window" />
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<meta name="abstract" content="Use these save methods to decrease your save window by saving to multiple devices." />
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<meta name="description" content="Use these save methods to decrease your save window by saving to multiple devices." />
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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>Save to multiple devices to reduce your save window</title>
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</head>
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<body id="rzaiuparandcon"><a name="rzaiuparandcon"><!-- --></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">Save to multiple devices to reduce your save window</h1>
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<div><p>Use these save methods to decrease your save window by saving to
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multiple devices.</p>
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<div class="section"><h4 class="sectiontitle">Set up saves to multiple devices</h4><p>You can reduce
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your save window by using multiple devices. When you save to multiple devices
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you can use one of two techniques. You can issue a single save operation as
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one job, or you can issue multiple save operations as several jobs.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Single save operation</h4><p>Save (or restore) operations
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identify a media file by the device (DEV), sequence number (SEQNBR), volume
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identifiers (VOL), and file label (LABEL) parameters. These parameters only
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allow one media file to be identified. However, a parallel save (or restore)
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operation uses more than one media file. You can solve this problem by using
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a media definition. </p>
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<p><img src="./delta.gif" alt="Start of change" />A media definition (*MEDDFN) allows
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you to identify more than one media file. A media definition defines the devices,
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sequence numbers, and volume identifiers that the parallel save operation
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will use. <img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />A media definition also allows
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you to specify whether to save the data in parallel or serial format and whether
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to use dynamic device allocation.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />You create a media definition
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by using the Create Media Definition (QsrCreateMediaDefinition (ILE) or QSRCRTMD
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(OPM)) API.<img src="./deltaend.gif" alt="End of change" /></p>
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</div>
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<div class="section"><h4 class="sectiontitle">Multiple save operation</h4><p>When you issue multiple
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save operations to save different sets of data to different media devices,
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you perform <em>concurrent</em> saves. The following scenarios provide some
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examples of situations when you may want to perform concurrent saves within
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the Integrated File System. </p>
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<ul><li>Save the complete Integrated File System structure and all user libraries
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concurrently: <pre>SAV DEV('/QSYS.LIB/TAP01.DEVD') OBJ(('/*') ('/QSYS.LIB' *OMIT) ('/QDLS' *OMIT))
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SAVLIB LIB(*ALLUSR) DEV(TAP02)</pre>
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</li>
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<li>Save separate unmounted user-defined file systems concurrently: <pre>SAV DEV('/QSYS.LIB/TAP01.DEVD') OBJ(('/dev/udfs-directory/udfs-01.udfs')
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SAV DEV('/QSYS.LIB/TAP02.DEVD') OBJ(('/dev/udfs-directory/udfs-02.udfs')</pre>
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</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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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzaiusavinglibraries.htm">Saving libraries to multiple devices for a single save operation</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzaiusavingifs.htm">Saving the Integrated File System using multiple devices for a single save operation</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzaiuparallelsettingup.htm">Dynamic device allocation</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzaiurzaiu363.htm">Restrictions for saving to multiple devices</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiuswaconsid.htm">Considerations and restrictions for the save-while-active function</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="rzaiurzaiu363.htm">Restrictions for saving to multiple devices</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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