69 lines
4.5 KiB
HTML
69 lines
4.5 KiB
HTML
<?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.Title" content="Example: Record format *V" />
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<meta name="abstract" content="This is an example of record format *V, which consists of a graphic with an explanation." />
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<meta name="description" content="This is an example of record format *V, which consists of a graphic with an explanation." />
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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>Example: Record format *V</title>
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</head>
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<body id="rbfv"><a name="rbfv"><!-- --></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">Example: Record format *V</h1>
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<div><p><span>This is an example of record format *V,
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which consists of a graphic with an explanation.</span></p>
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<div class="section"><p>Variable-length, deblocked, unspanned (*V).</p>
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</div>
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<div class="example"> <div class="fignone" id="rbfv__rbahh509.eps"><a name="rbfv__rbahh509.eps"><!-- --></a><span class="figcap">Figure 1. Variable-length, deblocked, unspanned
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(*V)</span><br /><img src="rbahh509.gif" alt="This graphic displays two
blocks and a record. The two blocks are named Block 1 and Block 2, while the
record is named Record A. Block 1 is comprised of XX YY and a Record A. Block
2 is comprised of XX YY and a Record B. Record A is comprised of VV WW and
Record A data. Record A and Block 1 both point toward each other." /><br /></div>
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</div>
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<div class="section"><p><var class="varname">XX</var> and <var class="varname">YY</var> make
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up the BDW. <var class="varname">XX</var> is the length of the record plus the length
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of the BDW (4 bytes). <var class="varname">YY</var> represents currently reserved
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fields and must be 00. <var class="varname">XX</var> should be the actual length of
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the data block that is written.</p>
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</div>
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<div class="section"><p>Record A has its own mapping by including
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the RDW. <var class="varname">VV</var> and <var class="varname">WW</var> make up the RDW. <var class="varname">VV</var> is
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the length of the record plus the length of the RDW (4 bytes). <var class="varname">WW</var> are
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currently reserved fields and must be 00. <var class="varname">VV</var> should be
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the actual block length (the value in <var class="varname">XX</var>) minus 4 bytes
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(size of BDW). <span class="keyword">i5/OS™</span> will
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pad blocks to make the 18-byte block limit. This occurs if the record data
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is less than 10 bytes (10 bytes plus 8 bytes of header information is the
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18-byte block limit). <span class="keyword">i5/OS</span> will
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pad the block with a byte of X'80' followed by bytes of X'00'.</p>
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</div>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> Record-format *V tapes created by <span class="keyword">i5/OS</span> that
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contain record data that is less than 10 bytes are not directly compatible
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with OS/390<sup>®</sup> and z/OS<sup>®</sup>.
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To process these tapes with OS/390 and z/OS, you need to code RECFM=VS or RECFM=VBS
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on the DD statement even though the records are not spanned. This allows OS/390 and z/OS to
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read the tapes without error.</div>
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</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="formd.htm" title="Here are some examples of different record formats.">Record formats</a></div>
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</div>
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</div>
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</body>
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</html> |