99 lines
6.0 KiB
HTML
99 lines
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HTML
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<meta name="DC.Title" content="Saving the Integrated File System using multiple devices for a single save operation" />
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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>Saving the Integrated File System using multiple devices for a single
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save operation</title>
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</head>
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<body id="rzaiusavingifs"><a name="rzaiusavingifs"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Saving the Integrated File System using multiple devices for a single
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save operation</h1>
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<div><p>A traditional save to a single device produces one tape file on the tape
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media. </p>
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<div class="p">You can perform a save operation while using more than one media devices
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simultaneously. Integrated File System data saved by a single SAV command
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using multiple devices will be in a <em>parallel</em> save format. The data
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is spread across the media devices. If you use Backup, Recovery and Media
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Services (BRMS), the save format is also parallel.<div class="note"><span class="notetitle">Note:</span> Using a media definition
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to save your Integrated File System data to a single device specified in a
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*MEDDFN is the same as specifying that device on the SAV command. It is
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not beneficial to use a *MEDDFN when saving to a single device. The data
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is saved in serial format.</div>
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</div>
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<div class="tablenoborder"><a name="rzaiusavingifs__serialvsparallel"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzaiusavingifs__serialvsparallel" frame="border" border="1" rules="all"><caption>Table 1. Integrated File System parallel saves</caption><thead align="left"><tr><th valign="top" width="33.33333333333333%" id="d0e28">Save scenario</th>
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<th valign="top" width="33.33333333333333%" id="d0e30">Using SAV command </th>
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<th valign="top" width="33.33333333333333%" id="d0e32">Using BRMS</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="33.33333333333333%" headers="d0e28 ">Save integrated file systems to multiple devices</td>
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<td valign="top" width="33.33333333333333%" headers="d0e30 ">Parallel </td>
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<td valign="top" width="33.33333333333333%" headers="d0e32 ">Parallel</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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<p><img src="./delta.gif" alt="Start of change" />This table shows the correlation between the Integrated File
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System being saved and the name of the media files being produced.<img src="./deltaend.gif" alt="End of change" /></p>
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<div class="tablenoborder"><img src="./delta.gif" alt="Start of change" /><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 2. Integrated File System saved</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e54">Data saved </th>
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<th valign="bottom" id="d0e56">Number of devices </th>
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<th valign="bottom" id="d0e58">Format </th>
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<th valign="bottom" id="d0e60">Tape media files produced</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e54 ">Integrated File System data </td>
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<td valign="top" headers="d0e56 ">1 </td>
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<td valign="top" headers="d0e58 ">Serial</td>
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<td valign="top" headers="d0e60 ">SAVdatetime</td>
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</tr>
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<tr><td valign="top" headers="d0e54 ">Integrated File System data</td>
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<td valign="top" headers="d0e56 ">2 </td>
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<td valign="top" headers="d0e58 ">Parallel </td>
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<td valign="top" headers="d0e60 ">Device 1: SAVdatetime Device 2: SAVdatetime</td>
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</tr>
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</tbody>
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</table>
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<img src="./deltaend.gif" alt="End of change" /></div>
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<p>Once you create a media definition, a convenient way to save the entire
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Integrated File System to multiple devices is to specify SAV DEV (’/QSYS.LIB/Y.LIB/X.meddfn’)
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OBJ ((’/*’) (’/QSYS.LIB’ *OMIT) (’/QDLS’ *OMIT). </p>
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<p>Backup Recovery Media Services/400 (BRMS) provides an easy to use interface
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that allows you to perform parallel save operations without creating a media
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definition. You specify which tape devices to use in parallel, and BRMS builds
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and manages the media definition for you.</p>
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<ol><li><div class="note"><span class="notetitle">Note:</span> Performing a parallel save with large objects may improve performance.
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However, if saving small objects, the performance may decrease.</div>
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</li>
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<li><div class="note"><span class="notetitle">Note:</span> Restoring individual objects from a parallel save may take a substantial
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amount of time.</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="rzaiurzaiuparandcon.htm" title="Use these save methods to decrease your save window by saving to multiple devices.">Save to multiple devices to reduce your save window</a></div>
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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html> |