53 lines
3.4 KiB
HTML
53 lines
3.4 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE html
|
||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html lang="en-us" xml:lang="en-us">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
|
|
<meta name="security" content="public" />
|
||
|
|
<meta name="Robots" content="index,follow" />
|
||
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
||
|
|
<meta name="DC.Type" content="concept" />
|
||
|
|
<meta name="DC.Title" content="Format of virtual tape images" />
|
||
|
|
<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." />
|
||
|
|
<meta name="description" 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." />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="rzam4virtualtape.htm" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
|
||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
|
||
|
|
<meta name="DC.Format" content="XHTML" />
|
||
|
|
<meta name="DC.Identifier" content="rzam4formatsvt" />
|
||
|
|
<meta name="DC.Language" content="en-us" />
|
||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
||
|
|
<!-- US Government Users Restricted Rights -->
|
||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
||
|
|
<title>Format of virtual tape images</title>
|
||
|
|
</head>
|
||
|
|
<body id="rzam4formatsvt"><a name="rzam4formatsvt"><!-- --></a>
|
||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
<h1 class="topictitle1">Format of virtual tape images</h1>
|
||
|
|
<div><p>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.</p>
|
||
|
|
<ul><li>Volumes with a Density of *VRT256K will use an optimum block size of 256KB. </li>
|
||
|
|
<li>Volumes with a Density of *VRT240K will use an optimum block size of 240KB. </li>
|
||
|
|
<li>Volumes with a Density of *VRT64K will use an optimum block size of 64KB.
|
||
|
|
</li>
|
||
|
|
<li>Volumes with a Density of *VRT32K will not use an optimum block size and
|
||
|
|
will be compatible with all devices.</li>
|
||
|
|
</ul>
|
||
|
|
<div class="p">You want to pick the largest compatible optimum block size to maximize
|
||
|
|
performance. The Initialize Tape (INZTAP) command can be used to change the
|
||
|
|
density of an existing volume. <div class="note"><span class="notetitle">Note:</span> Initialize tape (INZTAP) removes any
|
||
|
|
existing data on the tape.</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<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>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|