137 lines
7.9 KiB
HTML
137 lines
7.9 KiB
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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<meta name="DC.Title" content="Saving libraries to multiple devices for a single save operation" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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 libraries to multiple devices for a single save operation</title>
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</head>
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<body id="rzaiusavinglibraries"><a name="rzaiusavinglibraries"><!-- --></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">Saving libraries to multiple devices for a single save operation</h1>
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<div><p> A traditional save to a single device produces one or more tape files
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on the tape media. A media file is produced for each saved library. When data
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is saved to multiple devices in a single operation, the data can be saved
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in parallel format. The data in each media file is spread across each device.
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Each device may contain pieces of each saved object. When saving multiple
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libraries to multiple devices in a single operation, the data can also be
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saved in serial format. The data for each media file is entirely written to
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one device. Each device contains entire libraries.</p>
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<p>You can perform a save operation while using more than one media device
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simultaneously. If you save a single library, the data that is produced on
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the save media will have a <em>parallel</em> save format. The data is spread
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across the media devices. If you use Backup, Recovery and Media Services
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(BRMS), the save format is also parallel.</p>
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<p> If you save multiple libraries to more than one media device, the server
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saves each library to a single device in <em>serial</em> format. If you use
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BRMS to save multiple libraries to more than one media device, the format
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could be a mixture of parallel and serial formats. </p>
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<div class="p">The following shows when the server will use a parallel or serial save.<div class="note"><span class="notetitle">Note:</span> <img src="./delta.gif" alt="Start of change" />This table shows the default format. However, you now have the
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capability to specify the media definition and how the devices will be allocated.<img src="./deltaend.gif" alt="End of change" /></div>
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</div>
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<div class="tablenoborder"><a name="rzaiusavinglibraries__serialvsparallel"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzaiusavinglibraries__serialvsparallel" frame="border" border="1" rules="all"><caption>Table 1. Library parallel and serial saves</caption><thead align="left"><tr><th valign="top" width="33.33333333333333%" id="d0e35">Save scenario</th>
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<th valign="top" width="33.33333333333333%" id="d0e37">Using SAVLIB, SAVOBJ command <sup>2</sup></th>
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<th valign="top" width="33.33333333333333%" id="d0e41">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="d0e35 ">Save one library to multiple devices</td>
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<td valign="top" width="33.33333333333333%" headers="d0e37 ">Parallel</td>
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<td valign="top" width="33.33333333333333%" headers="d0e41 ">Parallel</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e35 ">Save multiple libraries to multiple devices</td>
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<td valign="top" width="33.33333333333333%" headers="d0e37 ">Serial<sup>1</sup></td>
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<td valign="top" width="33.33333333333333%" headers="d0e41 ">Could be a mixture of parallel and serial<sup>1</sup></td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e35 d0e37 d0e41 "> <dl><dt class="dlterm">1</dt>
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<dd>You can save these libraries in parallel format by creating data area
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QTEMP/QSRPARFMT. This capability does not apply if LIB(*ALLUSR), LIB(*IBM),
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or LIB(*NONSYS) is specified on the SAVLIB command.<div class="note"><span class="notetitle">Note:</span> This function is
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now available through the Create Media Definition (QSRCRTMD) API.</div>
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</dd>
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<dt class="dlterm">2</dt>
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<dd>To save to multiple devices using the SAVxxx commands, you must use a
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media definition (*MEDDFN).</dd>
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</dl>
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</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 libraries being
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saved and some possible results of the media files that are 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. Libraries saved</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e91">Data saved </th>
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<th valign="bottom" id="d0e93">Number of devices </th>
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<th valign="bottom" id="d0e95">Format </th>
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<th valign="bottom" id="d0e97">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="d0e91 ">Library A</td>
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<td valign="top" headers="d0e93 ">1</td>
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<td valign="top" headers="d0e95 ">Serial </td>
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<td valign="top" headers="d0e97 ">A </td>
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</tr>
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<tr><td valign="top" headers="d0e91 ">Library A </td>
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<td valign="top" headers="d0e93 ">2</td>
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<td valign="top" headers="d0e95 ">Parallel </td>
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<td valign="top" headers="d0e97 "><p>Device 1: A <br />
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Device 2: A </p>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e91 ">Libraries A, B, C, D </td>
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<td valign="top" headers="d0e93 ">1 </td>
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<td valign="top" headers="d0e95 ">Serial </td>
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<td valign="top" headers="d0e97 ">A, B, C, D </td>
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</tr>
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<tr><td valign="top" headers="d0e91 ">Libraries A, B, C, D</td>
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<td valign="top" headers="d0e93 ">2 </td>
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<td valign="top" headers="d0e95 ">Parallel </td>
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<td valign="top" headers="d0e97 "><p>Device 1: A, B, C, D <br />
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Device 2: A, B, C, D</p>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e91 ">Libraries A, B, C, D</td>
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<td valign="top" headers="d0e93 ">2</td>
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<td valign="top" headers="d0e95 ">Serial</td>
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<td valign="top" headers="d0e97 "><p>Device 1: A,C<br />
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Device 2: B, D</p>
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</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 all of your
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user libraries to multiple devices is to specify SAVLIB LIB(*ALLUSR) DEV(*MEDDFN).
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If you happen to have a particularly large library that you do not want to
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save in serial format, you could omit that library and save it individually
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in parallel format.</p>
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<p>Backup Recovery Media Services (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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</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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</body>
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</html>
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