77 lines
5.8 KiB
HTML
77 lines
5.8 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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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="High Performance Optical File System" />
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<meta name="abstract" content="High performance optical file system (HPOFS) is an IBM-developed media format architecture available to use when initializing optical media on the i5/OS." />
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<meta name="description" content="High performance optical file system (HPOFS) is an IBM-developed media format architecture available to use when initializing optical media on the i5/OS." />
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<meta name="DC.Relation" scheme="URI" content="rzam4optmedfrmat.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzam4hpofsdirstructperf.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzam4mediainterchange.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<title>High Performance Optical File System</title>
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</head>
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<body id="rzam4highperfofs"><a name="rzam4highperfofs"><!-- --></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">High Performance Optical File System</h1>
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<div><p>High performance optical file system (HPOFS) is an IBM-developed
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media format architecture available to use when initializing optical media
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on the i5/OS™.</p>
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<p>i5/OS uses
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the WORM-based version of HPOFS. This media format is designed (and required)
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for WORM media, but you can use it (and it is the default) when initializing
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erasable optical media. HPOFS is a WORM media format. You can write each sector
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of the media only once when creating and updating files and directories. This
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unique characteristic of never rewriting the same sector allows all previous
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versions of every file to remain on the media. One drawback of this is that
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media consumption continues to grow as you update and even delete files. </p>
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<p>This section contains detailed information on the i5/OS implementation of HPOFS for directly-attached
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optical media libraries. This section does not address HPOFS characteristics
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for LAN-attached optical media libraries.</p>
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<p>Detailed information on the i5/OS implementation of HPOFS for directly
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attached optical media libraries is available in the CL command support for
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media formats.</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="rzam4hpofsvoldirfile.htm">Volume, directory, and file names for HPOFS</a></strong><br />
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HPOFS volume identifiers can be a maximum of 32 characters and must contain only alphabetic characters (A through Z), numeric characters (0 through 9), a hyphen (-), or a period (.).</li>
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<li class="ulchildlink"><strong><a href="rzam4spcreclaim.htm">Space reclaim</a></strong><br />
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You can update or delete files even though HPOFS is a write-once read-many (WORM) media format.</li>
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<li class="ulchildlink"><strong><a href="rzam4hpofsproginter.htm">Programming interfaces (HPOFS)</a></strong><br />
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You can create or read files on HPOFS media by using either the Hierarchical File System (HFS) application programming interface (API) or the integrated file system application programming interface (API).</li>
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<li class="ulchildlink"><strong><a href="rzam4hpofsdirstructperf.htm">Directory structure and performance (HPOFS)</a></strong><br />
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HPOFS volumes have a dual directory structure to access files. Both a hash and hierarchical structure exist to provide a primary and secondary path to the file data. If the primary directory structure becomes damaged, the secondary path is used.</li>
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<li class="ulchildlink"><strong><a href="rzam4mediainterchange.htm">Media interchange between LAN and direct attach libraries</a></strong><br />
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This topic lists how HPOFS formatted optical media created in a LAN-attached optical library can be accessed.</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="rzam4optmedfrmat.htm" title="i5/OS provides support for several optical media types and media formats.">Optical media formats</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzam4clcomsupfmts.htm" title="This topic provides information on using i5/OS commands to save and restore data and some of the restrictions for the ISO 9660, High Performance Optical File System (HPOFS), and universal disk format (UDF) media formats.">CL command support for media formats</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>
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