84 lines
5.7 KiB
HTML
84 lines
5.7 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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<meta name="DC.Title" content="Storage area networks" />
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<meta name="abstract" content="This topic describes what storage area networks (SANs) are and how they can be used to provide centralized storage. It discusses advantages and disadvantages and links you to more detailed information." />
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<title>Storage area networks</title>
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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">Storage area networks</h1>
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<div><p>This topic describes what storage area networks (SANs) are and
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how they can be used to provide centralized storage. It discusses advantages
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and disadvantages and links you to more detailed information.</p>
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<p>SANs are a newer development in the disk and tape attachment business.
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They consolidate the storage of multiple, storage devices into a single set
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of centrally managed resources. To do so, they employ a combination of technologies,
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including hardware, software, and networking components. They support direct,
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high-speed data transfers between servers and storage devices in the following
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ways:</p>
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<ul><li><dfn class="term">Server to storage.</dfn> This is the traditional model of interaction
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with storage devices. The advantage of a SAN in this case is that the same
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storage device may be accessed serially or concurrently by multiple servers.</li>
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<li><dfn class="term">Server to server.</dfn> A SAN may be used for high-speed, high-volume
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communications between servers.</li>
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<li><dfn class="term">Storage to storage.</dfn> This SAN data movement capability enables
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data to be moved without server intervention, thereby freeing server processor
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cycles for other activities like application processing. Examples include
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a disk device backing up its data to a tape device without server intervention
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or remote device mirroring across the SAN. This type of data transfer is not
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currently available on the iSeries™ server.</li>
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</ul>
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<p></p>
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<p>SANs provide many benefits in your iSeries network, including the following:</p>
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<ul><li><dfn class="term">Scalability.</dfn> Storage is independent of the server itself,
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so you are not limited by the number of disks you can attach directly to the
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server.</li>
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<li><dfn class="term">Improved availability of applications.</dfn> Storage is independent
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of applications and is accessible through alternative data paths.</li>
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<li><dfn class="term">Better application performance.</dfn> Storage processing is moved
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from the servers onto a separate network.</li>
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<li><dfn class="term">Centralized and consolidated storage.</dfn>Storage capacity can
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be connected to servers at a greater distance, and storage resources can be
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disconnected from individual hosts. The results can be lower overall costs
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through better use of the storage, lower management costs, increased flexibility,
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and increased control.</li>
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<li><dfn class="term">Data transfer for storage at remote sites.</dfn> You can keep a
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remote copy of data for disaster protection.</li>
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<li><dfn class="term">Simplified centralized management.</dfn>A single image of storage
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media simplifies management.</li>
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</ul>
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</div>
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<div>
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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="relinfo"><strong>Related information</strong><br />
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<div><a href="http://www.redbooks.ibm.com/abstracts/sg245470.html?Open" target="_blank">Introduction to Storage Area Networks</a></div>
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<div><a href="http://www.redbooks.ibm.com/abstracts/sg246220.html?Open" target="_blank">iSeries in Storage Area Networks A Guide to Implementing FC Disk and Tape with iSeries</a></div>
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</div>
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</div>
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</body>
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