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4.3 KiB
HTML
68 lines
4.3 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="DC.Type" content="concept" />
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<meta name="DC.Title" content="Tape data files" />
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<meta name="abstract" content="Learn about the different formats used for tape data files and how they should be used." />
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<meta name="description" content="Learn about the different formats used for tape data files and how they should be used." />
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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="multf" />
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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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<title>Tape data files</title>
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</head>
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<body id="multf"><a name="multf"><!-- --></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">Tape data files</h1>
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<div><p><span>Learn about the different formats used
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for tape data files and how they should be used.</span></p>
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<p>A tape data file contains output records produced by an application program.
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These files are used to store data on tape media. The tape data files are
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stored and accessed on tape by a tape device file.</p>
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<p>The different data files that exist are:</p>
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<ul><li>Single volume – A file that is contained on one volume of tape.</li>
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<li>Multivolume – A file that is contained on more than one volume of tape.</li>
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<li>Multifile volumes – Volumes of tape that contain more than one data file.</li>
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</ul>
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<p>If you use multivolume-tape data files, then follow these conventions:</p>
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<ul><li>The labels on each volume must be consistent. You cannot have standard
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labeled tapes and unlabeled tapes in the same tape group.</li>
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<li>Write all volumes and density in the same character code (EBCDIC or ASCII).</li>
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<li>Each tape in the group must have the same record format, block length,
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and record length.</li>
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<li>If you specify more than one tape device, then place the volumes on the
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devices in the sequence that is specified in the tape device file. Refer to
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the following reference: <a href="#multf__rbahh502.eps">Figure 1</a>. For example: <ul><li>The data file consists of four volumes, such as VOL01, VOL02, VOL03, and
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VOL04.</li>
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<li>The tape devices specified, in order, are TAPE01, TAPE02, and TAPE03.</li>
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</ul>
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<p>Then place the volumes on a tape device as follows: VOL01 on TAPE01,
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VOL02 on TAPE02, VOL03 on TAPE03, and VOL04 on TAPE01.</p>
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<div class="fignone" id="multf__rbahh502.eps"><a name="multf__rbahh502.eps"><!-- --></a><span class="figcap">Figure 1. Multivolume-tape-data-file-sequence using three tape devices</span><br /><img src="rbahh502.gif" alt="This graphic is described
above in the example list." /><br /></div>
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<p>If you use volumes, in reverse order, by reading backwards, then
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VOL04 is on TAPE01, VOL03 on TAPE02, VOL02 on TAPE03, and VOL01 on TAPE01.</p>
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<div class="fignone" id="multf__rbahh501.eps"><a name="multf__rbahh501.eps"><!-- --></a><span class="figcap">Figure 2. Sequence in reverse order</span><br /><img src="rbahh501.gif" alt="This graphic is also described
in the text above it." /><br /></div>
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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 class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="concept.htm" title="Find out how tape files operate on your server.">Concepts</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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