117 lines
6.9 KiB
HTML
117 lines
6.9 KiB
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<meta name="DC.Title" content="VOL parameter" />
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<meta name="abstract" content="The volume (VOL) parameter specifies the volume identifiers of the volumes used in a tape or optical operation." />
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<title>VOL parameter</title>
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<body id="rbam6volexpand"><a name="rbam6volexpand"><!-- --></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">VOL parameter</h1>
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<div><p>The volume (VOL) parameter specifies the volume identifiers of
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the volumes used in a tape or optical operation. </p>
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<div class="section"><p>A tape volume consists of a tape cartridge or reel. An optical
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volume consists of a single side of an optical cartridge or a single CD-ROM.
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Optical cartridges are dual-sided and each side is a separate volume.</p>
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<p>The
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volume identifier is the identifier stored on each tape or optical disk (in
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the volume label area) that it identifies. An inquiry message is sent to
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the system operator if a volume identifier is missing or out of order.</p>
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<p>Tape
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volumes must be on the tape units in the same order as their identifiers are
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specified in the VOL parameter and as the device names are specified in the
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DEV parameter of the tape device file commands. However, if the tapes are
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read backward (a function supported in COBOL), the volumes must be in reverse
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order to that specified in the VOL parameter. Nevertheless, the device names
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are still specified in forward order in the DEV parameter.</p>
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<p> In general,
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the rule for specifying tape volume identifiers is that as many as 6 characters,
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containing any combination of letters and digits, can be used. Special characters
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can be used if the identifier is enclosed in apostrophes. However, if the
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tape is used on a system other than an iSeries™ system, the requirements for
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specifying identifiers on that system must be considered. </p>
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<p>Optical volume
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identifiers can be up to 32 characters long and can contain any combination
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of digits and upper case letters. Each optical volume identifier must be unique.
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No two optical volumes with the same identifier can be present on the system
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at the same time.</p>
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<p> For labeled tapes, the following rules apply: </p>
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<ul><li>Characters: A maximum of 6 characters, or fewer, can be specified for
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each volume identifier. Alphabetic and numeric characters can be used in any
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order.</li>
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<li>Uniqueness: More than one volume can have the same identifier. You may
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have a file using the same identifier for several volumes; in this case, the
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system keeps track of the order internally with a sequence number written
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on the volumes. However, volume identifiers should be unique whenever possible.</li>
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<li>Order: When multiple volumes (with different identifiers) are used in
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a single operation, they must be in the same order as the volume identifiers
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specified in the VOL parameter.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Multivolume files</h4><p>If multiple volumes (tapes) are
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used in an operation and all have the same volume identifier, that identifier
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must be specified in the VOL parameter once for each volume used. For example,
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if three tapes named QGPL are used in a save operation, VOL(QGPL QGPL QGPL)
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must be specified.</p>
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<p>When a multivolume file on <em>tape</em> is processed
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and multiple tape units are used, the tape volumes must be placed in the tape
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devices in the same order as they are specified in the VOL parameter. For
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example, if five volumes and three tape units are used, they are mounted as
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follows: VOL1 on unit 1, VOL2 on unit 2, VOL3 on unit 3, VOL4 on unit 1, and
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VOL5 on unit 2.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Values allowed</h4><dl><dt class="dlterm">*MOUNTED</dt>
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<dd>The volume currently placed in the device is used.</dd>
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<dt class="dlterm">*NONE</dt>
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<dd> No volume identifier is specified.</dd>
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<dt class="dlterm">*SAME</dt>
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<dd> Previously specified volume identification does not change.</dd>
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<dt class="dlterm">*SAVVOL</dt>
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<dd>The system, using the save/restore history information, determines which
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tape volumes contain the most recently saved version. If the device specified
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in the DEV parameter of the restore command does not match the device of the
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most recently saved version of the object, an error message is returned to
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the user, and the function is ended. If the wrong volume is mounted in the
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unit specified by the command, a message is returned to the system operator
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that identifies the first volume that must be placed in the device before
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the restore operation can begin.</dd>
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<dt class="dlterm"><var class="varname">volume-identifier</var></dt>
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<dd>Specify the identifiers of one or more volumes in the order in which they
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are put on the device and used. Each tape volume identifier contains a maximum
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of 6 alphanumeric characters. Each optical volume identifier contains a maximum
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of 32 characters. A blank is used as a separator character when listing multiple
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identifiers.</dd>
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</dl>
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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="rbam6expand.htm" title="This section contains the expanded descriptions of some of the parameters commonly used in the CL commands.">Commonly used parameters</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="../rzau8/kickoff.htm">Optical programming</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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