95 lines
6.1 KiB
HTML
95 lines
6.1 KiB
HTML
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<meta name="DC.Title" content="Control tape library resources using tape library attributes" />
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<meta name="abstract" content="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." />
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<title>Control tape library resources using tape library attributes</title>
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</head>
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<body id="rzam4mla"><a name="rzam4mla"><!-- --></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 using tape library attributes</h1>
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<div><p>Depending on your business environment you might want to control
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the use of tape resources to allow important jobs to finish quickly. i5/OS™ provides
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several features for this.</p>
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<p>You can use the Change Job Media Library Attributes (CHGJOBMLBA) command
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to change the priority of tape resource requests for a particular job, and
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the Work with MLB Resource Queue (WRKMLBRSCQ) command to work with the tape
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resource manager queue.</p>
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<div class="section"><h4 class="sectiontitle">Change tape library job attributes</h4><p>The CHGJOBMLBA
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command allows you to change the resource allocation attributes for your own
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job or another user's job if you have *JOBCTL special authority. You can use
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the resource allocation priority to change the priority of requests to use
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a tape resource within a tape library. You can assign a higher priority to
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certain jobs to allow them to get a tape resource as soon as one becomes available.
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You can assign a lower priority to jobs that can wait until all other higher
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priority jobs finish using the tape resources. Typically, very short-running
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tape operations such as the dynamic retrieval of an object that was saved
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storage free should be assigned a high resource allocation priority. Long-running
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jobs that are not required to finish quickly, such as Duplicate Tape (DUPTAP)
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or Display Tape (DSPTAP), can be assigned a lower resource allocation priority.</p>
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<p>You
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can also add *MLBA to either the Work with Job (WRKJOB) or Display Job (DSPJOB)
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command in order to view or adjust your tape library attributes.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Change access to a tape resource within a library</h4><p>The
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WRKMLBRSCQ command allows you to manipulate the requests to use a tape resource
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within a tape media library. The WRKMLBRSCQ command shows the resources that
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are currently processing a request, have a category mounted, or the requests
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that are waiting to be assigned a tape resource. You can change the resource
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allocation attributes for requests that are waiting to use a tape resource
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by using option 2 (Change Request MLB Attributes) on the Work with MLB Resource
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Queue (WRKMLBRSCQ) display. The attributes for the next request can be changed
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by using the CHGJOBMLBA command to change the resource allocation attributes
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for the job that is currently using the tape resource. You can do this by
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using option 5 (Work with job) on the Work with MLB Resource Queue (WRKMLBRSCQ)
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display, and then selecting option 21 (Work with media library attributes).</p>
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<p>There
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are times when a request will show a priority of 0. These requests are for
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when a tape resource is being used by the system for a tape operation. An
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example is when a tape command using ENDOPT(*UNLOAD) is completed and the
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system is still unloading the cartridge.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Change tape library attributes with APIs</h4><p>You can
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use the Retrieve Job Media Library Attributes (QTARJMA) and Change Job Media
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Library Attributes (QTACJMA) APIs to control tape library attributes programmatically.
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For a more detailed description and an example, see Control tape library attributes
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with APIs.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzam4chgmlbwithapi.htm">Control tape library resources with APIs</a></strong><br />
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Use the QTARJMA and QTACJMA APIs to retrieve and to change the tape library attributes for a specific job.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzam4usetapelib.htm" title="This topic provides usage and management information for tape libraries.">Use tape libraries</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="../rbam6/rbam6clmain.htm">Control language (CL)</a></div>
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</div>
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</div>
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</body>
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