53 lines
2.8 KiB
HTML
53 lines
2.8 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Read and write considerations" />
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<meta name="abstract" content="Learn the read and write considerations for tape." />
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<meta name="description" content="Learn the read and write considerations for tape." />
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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>Read and write considerations</title>
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</head>
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<body id="rwcon"><a name="rwcon"><!-- --></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">Read and write considerations</h1>
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<div><p>Learn the read and write considerations for tape.</p>
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<ul><li>Specify record lengths in your program when writing
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variable-length records (*D, *DB, *V, *VB, *VS, *VBS, or *U specified on the
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RCDBLKFMT parameter on the CRTTAPF command). <div class="p">If the maximum record length
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on tape is shorter than the output record length (because of overrides or
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existing file labels): <ul><li>The system truncates the records to the maximum length that is allowed.</li>
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<li>The system sends a diagnostic message when you open a device file to indicate
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that output records may be truncated.</li>
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</ul>
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</div>
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</li>
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<li>If the program specifies a record length that differs from the actual
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length of the data, the system pads or truncates the data to match the program
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specification.</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="inoutpro.htm" title="Learn the basics for I/O procedures on tape.">Input/output processing for tape</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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