53 lines
3.4 KiB
HTML
53 lines
3.4 KiB
HTML
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<meta name="DC.Title" content="Format of virtual tape images" />
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<meta name="abstract" content="The density (format) parameter controls the optimum block size that the volume will use so the created volume will be compatible for duplication to your physical tape device." />
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<title>Format of virtual tape images</title>
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<body id="rzam4formatsvt"><a name="rzam4formatsvt"><!-- --></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">Format of virtual tape images</h1>
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<div><p>The density (format) parameter controls the optimum block size
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that the volume will use so the created volume will be compatible for duplication
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to your physical tape device.</p>
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<ul><li>Volumes with a Density of *VRT256K will use an optimum block size of 256KB. </li>
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<li>Volumes with a Density of *VRT240K will use an optimum block size of 240KB. </li>
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<li>Volumes with a Density of *VRT64K will use an optimum block size of 64KB.
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</li>
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<li>Volumes with a Density of *VRT32K will not use an optimum block size and
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will be compatible with all devices.</li>
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</ul>
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<div class="p">You want to pick the largest compatible optimum block size to maximize
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performance. The Initialize Tape (INZTAP) command can be used to change the
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density of an existing volume. <div class="note"><span class="notetitle">Note:</span> Initialize tape (INZTAP) removes any
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existing data on the tape.</div>
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<div>
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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="rzam4virtualtape.htm" title="When you use virtual tape devices, you create virtual tape volumes that exist on your server disk units.">Virtual tape</a><img src="./deltaend.gif" alt="End of change" /></div>
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