64 lines
4.3 KiB
HTML
64 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE 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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Performance considerations for directly-attached optical media libraries" />
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<meta name="abstract" content="This topic discusses performance considerations that are specific to directly-attached optical libraries." />
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<meta name="description" content="This topic discusses performance considerations that are specific to directly-attached optical libraries." />
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<meta name="DC.Relation" scheme="URI" content="rzam4expbufferioapi.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzam4perfconscpydup.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzam4schvolmmntdismnt.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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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>Performance considerations for directly-attached optical media libraries </title>
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</head>
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<body id="rzam4perfoptmedlib"><a name="rzam4perfoptmedlib"><!-- --></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">Performance considerations for directly-attached optical media libraries </h1>
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<div><p>This topic discusses performance considerations that are specific
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to directly-attached optical libraries.</p>
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<p>When a file has extended attributes, they are stored separately from the
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data. When the data is written or copied, the attributes must also be written
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or copied. If file attributes are not required, attribute copying can be suppressed
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when copying between the QOPT and QDLS files systems by using the Change Optical
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(CHGOPTA) command. Setting the copy attributes (CPYATR) value on the CHGOPTA
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command to *NO suppresses the copying of attributes between the QOPT and QDLS
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file systems.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzam4expbufferioapi.htm">Expand buffer I/O with the HFS API</a></strong><br />
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Users of the <span class="apiname">HFS</span> APIs can improve performance
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by taking advantage of the expanding buffer I/O option. Expanding the buffer
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I/O settings lets you control the amount of data that is read
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from the optical media when only parts of the entire file need to be read.</li>
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<li class="ulchildlink"><strong><a href="rzam4perfconscpydup.htm">Performance consideration for copying and duplicating optical volumes</a></strong><br />
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There are several performance considerations to be aware of when copying and duplication optical volumes.</li>
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<li class="ulchildlink"><strong><a href="rzam4schvolmmntdismnt.htm">Volume mounting and dismounting schedule timers</a></strong><br />
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This topic provides information on how the iSeries™ server manages work requests
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to the directly attached optical library devices. It is a high-level view
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and does not include all program logic. </li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzam4mgeperfoptmedlib.htm" title="This topic describes performance considerations for users of optical media libraries.">Manage performance in optical media libraries</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> |