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123 lines
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<meta name="DC.Title" content="Concepts for virtual storage" />
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<meta name="abstract" content="This topic provides general information about virtual storage, including descriptions and instructions for use." />
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<title>Concepts for virtual storage</title>
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<body id="rzam4virtualconcepts"><a name="rzam4virtualconcepts"><!-- --></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">Concepts for virtual storage</h1>
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<div><p>This topic provides general information about virtual storage,
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including descriptions and instructions for use.</p>
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<p>When you use virtual storage, you create virtual tape, CD, or DVD images
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that exist on your server disk units. The objects that virtual storage uses
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are as follows:</p>
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<div class="section"><h4 class="sectiontitle">Virtual storage device</h4><p>A <span class="uicontrol">virtual storage
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device</span> is a device description that supports virtual storage,
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like an actual tape or optical device description supports actual storage.
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One to 35 virtual storage tape device descriptions and one to 35 virtual storage
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optical device descriptions can be active at a time on the server.</p>
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<p>You
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create a virtual tape device by selecting the RSRCNAME(*VRT) or TYPE(63B0)
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parameters on the Create Device Description (Tape) or (CRTDEVTAP) command.</p>
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<p>You
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create a virtual optical device by selecting the RSRCNAME(*VRT) or TYPE(632B)
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parameters in Create Device Description (Optical) or (CRTDEVOPT) command.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Image catalog</h4><p>An <span class="uicontrol">image catalog</span> is
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an object that can contain up to 256 image catalog entries. Each catalog is
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associated with one user-specified integrated file system directory. The system-recognized
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identifier for the object type is *IMGCLG. Image catalogs can have the following
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statuses:</p>
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<dl><dt class="dlterm">Ready</dt>
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<dd> All of the loaded and mounted image catalog entries are available for
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use by the virtual storage device. The image catalog can be made
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ready by using the LODIMGCLG (Load Image Catalog) command with the parameter
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OPTION(*LOAD).</dd>
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<dt class="dlterm">Not Ready</dt>
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<dd>None of the image catalog entries in the image catalog are available for
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use by the virtual storage device.</dd>
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</dl>
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<p>You can view or change image catalogs by using the Work
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with Image Catalogs (WRKIMGCLG) command.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Write protection</h4><p><span class="uicontrol">Write protection</span> refers
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to whether you have enabled the write protection switch for an image catalog
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entry. The status for write protection are as follows:</p>
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<dl><dt class="dlterm">Y</dt>
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<dd>Write protection is set for the image catalog entry. You cannot write
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to the virtual image associated with the image catalog entry.</dd>
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<dt class="dlterm">N</dt>
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<dd>Write protection is not set for the image catalog entry. You can write
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to the virtual image associated with the image catalog entry.</dd>
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</dl>
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<div class="p"><span class="uicontrol">For optical use only</span> <div class="note"><span class="notetitle">Note:</span> If the
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access for an optical image catalog entry is *READWRITE, you set the write
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protection switch to Y or N. If the access for the optical image catalog
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entry is *READONLY, the write protection switch is always set to Y.</div>
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</div>
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<p>You
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can view or change image catalog entries by using the Work with Image Catalog
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Entries (WRKIMGCLGE) command. The WRKIMGCLGE command indicates if the image
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catalog is in a Ready state or a Not ready state, and you can use this command
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to change image catalog entries whether the image catalog is in a Ready state
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or a Not ready state.</p>
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<p>You can change image catalog entries by using
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the Load/Unload/Mount IMGCLG Entry (LODIMGCLGE) command or by typing <samp class="codeph">GO
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IMGCLG</samp> at a command line.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Virtual image</h4><p>A <span class="uicontrol">virtual image</span> is
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an object that contains the data that is typically on physical media. The
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virtual image is a stream file that resides in the integrated file system.
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In a backup and recovery scenario, you can also span virtual images.</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"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzam4virtualwhatis.htm">Benefits of virtual storage</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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Virtual storage can help eliminate media errors and user intervention and can increase system availability.</li>
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<li class="ulchildlink"><img src="./delta.gif" alt="Start of change" /><strong><a href="rzam4catalogshodowing.htm">Catalog Shadowing</a></strong><img src="./deltaend.gif" alt="End of change" /><br />
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Use catalog shadowing to create a copy of an existing image catalog.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <img src="./delta.gif" alt="Start of change" /><a href="rzam4virtualstorage.htm" title="Virtual storage consists of objects that, when used together, imitate tape, CD, DVD, and write-once read-many (WORM) media on your disk units. The imitated media appear to the server to be actual media.">Virtual storage</a><img src="./deltaend.gif" alt="End of change" /></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="../cl/wrkimgclg.htm">Work with Image Catalogs (WRKIMGCLG)</a></div>
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<div><a href="../cl/wrkimgclge.htm">Work with Image Catalog Entries (WRKIMGCLGE)</a></div>
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<div><a href="../cl/lodimgclge.htm">Load/Unload/Mount IMGCLG Entry (LODIMGCLGE)</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="../books/sc415302.pdf" target="_blank">iSeries Security Reference</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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