134 lines
6.7 KiB
HTML
134 lines
6.7 KiB
HTML
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<meta name="abstract" content="Use the QTARJMA and QTACJMA APIs to retrieve and to change the tape library attributes for a specific job." />
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<title>Control tape library resources with APIs</title>
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<body id="rzam4chgmlbwithapi"><a name="rzam4chgmlbwithapi"><!-- --></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">Control tape library resources with APIs</h1>
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<div><p>Use the QTARJMA and QTACJMA APIs to retrieve and to change the
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tape library attributes for a specific job.</p>
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<div class="section"><p>For more information about the fields for the APIs, see:</p>
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<ul><li>Retrieve Job Media Library Attributes (QTARJMA) API</li>
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<li>Change Job Media Library Attributes (QTACJMA) API</li>
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</ul>
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<p>Special attention to authority requirements is required when retrieving
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and changing the resource allocation attributes. The following provides examples
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of using both APIs.</p>
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</div>
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<ol><li class="stepexpand"><span>An application using the QTARJMA API retrieves information about
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the tape library attributes for the current job where the user running the
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job does not have *JOBCTL special authority. </span> <p><strong>Current library
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attributes</strong></p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e41">MLB name</th>
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<th valign="top" id="d0e43">RSCALCPTY</th>
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<th valign="top" id="d0e45">INLMNTWAIT</th>
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<th valign="top" id="d0e47">EOVMNTWAIT</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e41 ">*DEFAULT</td>
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<td valign="top" headers="d0e43 ">*DEV</td>
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<td valign="top" headers="d0e45 ">*DEV</td>
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<td valign="top" headers="d0e47 ">*DEV</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li>
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<li class="stepexpand"><span>The application then uses the QTACJMA API to change the initial
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mount wait time (INLMNTWAIT) and the end of volume mount wait time (EOVMNTWAIT).</span> <p><strong>The application changes the library attributes</strong></p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e75">MLB name</th>
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<th valign="top" id="d0e77">RSCALCPTY</th>
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<th valign="top" id="d0e79">INLMNTWAIT</th>
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<th valign="top" id="d0e81">EOVMNTWAIT</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e75 ">*DEFAULT</td>
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<td valign="top" headers="d0e77 ">*DEV</td>
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<td valign="top" headers="d0e79 ">*IMMED</td>
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<td valign="top" headers="d0e81 ">*NOMAX</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li>
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<li class="stepexpand"><span>A system administrator with *JOBCTL special authority uses the
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CHGJOBMLBA command to change the resource allocation priority (RSCALCPTY),
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initial mount wait time, and the end of volume mount wait time.</span> <p><strong>System
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administrator changes attributes</strong></p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e109">MLB name</th>
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<th valign="top" id="d0e111">RSCALCPTY</th>
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<th valign="top" id="d0e113">INLMNTWAIT</th>
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<th valign="top" id="d0e115">EOVMNTWAIT</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e109 ">*DEFAULT</td>
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<td valign="top" headers="d0e111 ">50</td>
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<td valign="top" headers="d0e113 ">*IMMED</td>
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<td valign="top" headers="d0e115 ">500</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li>
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<li class="stepexpand"><span>The application tries to use the QTACJMA API to restore the tape
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library attributes it retrieved earlier by using the QTACJMA API *REPLACE
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option. However, this function fails with an error message of CPF67B4 because
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the user does not have *JOBCTL special authority. None of the attributes are
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changed.</span> <p><strong>Original application fails to restore attributes</strong></p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e143">MLB name</th>
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<th valign="top" id="d0e145">RSCALCPTY</th>
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<th valign="top" id="d0e147">INLMNTWAIT</th>
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<th valign="top" id="d0e149">EOVMNTWAIT</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e143 ">*DEFAULT</td>
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<td valign="top" headers="d0e145 ">50</td>
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<td valign="top" headers="d0e147 ">*IMMED</td>
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<td valign="top" headers="d0e149 ">500</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li>
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</ol>
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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="rzam4mla.htm" title="Depending on your business environment you might want to control the use of tape resources to allow important jobs to finish quickly. i5/OS provides several features for this.">Control tape library resources using tape library attributes</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/qtarjma.htm">Retrieve Job Media Library Attributes (QTARJMA)</a></div>
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<div><a href="../apis/qtacjma.htm">Change Job Media Library Attributes (QTACJMA)</a></div>
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</div>
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</div>
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</body>
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