153 lines
9.1 KiB
HTML
153 lines
9.1 KiB
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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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Optical storage" />
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<meta name="abstract" content="This topic provides an overview and reference guide for IBM optical support on the iSeries server with the i5/OS operating system." />
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<meta name="description" content="This topic provides an overview and reference guide for IBM optical support on the iSeries server with the i5/OS operating system." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<title>Optical storage</title>
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<body id="rzam4optical"><a name="rzam4optical"><!-- --></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">Optical storage</h1>
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<div><p>This topic provides an overview and reference guide for IBM<sup>®</sup> optical support
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on the iSeries™ server
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with the i5/OS™ operating
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system.</p>
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<div class="p">These functions that are unique to optical support:<ul><li>CD-ROM devices </li>
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<li>DVD devices Directly attached optical media library devices </li>
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<li>LAN-attached optical media library devices </li>
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<li>Virtual Optical devices</li>
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</ul>
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</div>
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<div class="p">The information contained in this topic is intended for the following audiences: <ul><li>System operators and end users iSeries server operators and end users
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can use this information as their primary reference for CD-ROM, DVD, optical
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media libraries, and virtual optical support.</li>
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<li>Service representatives can use this information to perform activities
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as directed by the appropriate optical device service guides.</li>
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</ul>
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</div>
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<p>Optical storage on the iSeries server provides an economical and efficient
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way to store and retrieve large amounts of information at a high performance
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level. Optical storage devices offer significant advantages over other high-capacity
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storages devices, such as tape and microfilm, with faster access times and
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a hierarchical-type file organization. i5/OS optical storage uses files that are
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stored in directories and files that are stored in subdirectories similar
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to UNIX<sup>®</sup> or
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PC-based file systems.</p>
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<p>The capacity, price, and performance of optical storage continually improve,
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and IBM remains
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committed to providing its customers with these improvements over time. Even
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as new devices are introduced, the basic methods of accessing optical information
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remain consistent, as these new storage devices are being added under the
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current file system interfaces that optical storage programs have used for
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years.</p>
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<div class="p">Optical Storage is any storage method that uses a laser to store and retrieve
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data from media. Examples of this media are compact disk read-only memory
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(CD-ROM), digital versatile disk read-only memory (DVD-ROM), digital versatile
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disk random access memory (DVD-RAM), write-once read-many (WORM) cartridges,
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and erasable optical cartridges. These are some considerations in the usage
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of optical storage media:
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Optical media considerations</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e72">Consideration</th>
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<th valign="bottom" id="d0e74">Reason for use</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e72 ">Durability</td>
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<td valign="top" headers="d0e74 ">Optical media can have a shelf life in excess of 50
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years</td>
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</tr>
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<tr><td valign="top" headers="d0e72 ">Archive Storage</td>
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<td valign="top" headers="d0e74 ">Write-once read-many (WORM) optical media can be used
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to archive large amounts of data. Each sector on the media is only written
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once when creating and updating files and directories. When a file is changed
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or deleted, a new version of the file gets written, but the old version still
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exists on the media. All previous versions of the file remain recorded on
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the media. This capability also exists on erasable media, but the entire
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disk may be erased and reused.</td>
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</tr>
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<tr><td valign="top" headers="d0e72 ">Transportability</td>
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<td valign="top" headers="d0e74 ">Optical media written with the Universal Disk Format
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(UDF) media format can be read with any other industry operating system platform
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that supports UDF, which is an industry standard file system. Optical Media
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written with High Performance Optical File System (HPOFS) format can be interchanged
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with other optical media libraries attached to iSeries.</td>
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</tr>
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<tr><td valign="top" headers="d0e72 ">Random access</td>
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<td valign="top" headers="d0e74 ">Optical devices are random access devices. This facilitates
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the retrieval of relevant data on demand. File access is independent of the
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order in which the data was stored. Also, multiple users can access the same
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volume at the same time.</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<p>When you use virtual optical storage, you create and use optical images
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that are stored on your disk units. These optical images are treated as if
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they were real optical disk media by the internal file system functions.
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The term virtual applies to the emulation of the optical media sectors when
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used by read and write functions. Virtual optical media appear as *DVDRAM
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media in the volume information attributes.</p>
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<div class="note"><span class="notetitle">Note:</span> IBM grants you a nonexclusive copyright license to use all programming
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code examples from which you can generate similar function tailored to your
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own specific needs.<p>SUBJECT TO ANY STATUTORY WARRANTIES
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WHICH CANNOT BE EXCLUDED, IBM, ITS PROGRAM DEVELOPERS AND SUPPLIERS MAKE NO
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WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE, AND NON-INFRINGEMENT, REGARDING THE PROGRAM OR TECHNICAL
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SUPPORT, IF ANY. </p>
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<p>UNDER NO CIRCUMSTANCES IS IBM, ITS PROGRAM
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DEVELOPERS OR SUPPLIERS LIABLE FOR ANY OF THE FOLLOWING, EVEN IF INFORMED
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OF THEIR POSSIBILITY: </p>
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<ol><li>LOSS OF, OR DAMAGE TO, DATA;</li>
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<li>DIRECT, SPECIAL, INCIDENTAL, OR INDIRECT DAMAGES, OR FOR ANY ECONOMIC
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CONSEQUENTIAL DAMAGES; OR </li>
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<li>LOST PROFITS, BUSINESS, REVENUE, GOODWILL, OR ANTICIPATED SAVINGS.</li>
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</ol>
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<p>SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION
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OF DIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, SO SOME OR ALL OF THE ABOVE
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LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU.</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"><strong><a href="rzam4supportedhardwareops.htm">Supported Hardware for Optical Storage</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzam4cd.htm">Optical devices</a></strong><br />
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Your server comes with a rack-mounted CD-ROM or DVD-ROM drive.</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="rzam4overview.htm" title="As your company produces a greater volume of information, and as the value of that information grows, the methods you use to protect and preserve it become vital corporate strategies. Storage has gone from being a feature of a server to being an entity unto itself.">Storage solutions</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="rzam4tapevsoptical.htm" title="Offline storage is data that you save on media that is separate from the server.">Comparison of offline storage</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="http://www.ibm.com/servers/storage/media/diskettes_optical/index.html" target="_blank">Tape and Optical Storage</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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