92 lines
5.5 KiB
HTML
92 lines
5.5 KiB
HTML
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<?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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="iSeries storage management overview" />
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<meta name="abstract" content="This topic discusses iSeries storage management methods." />
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<meta name="description" content="This topic discusses iSeries storage management methods." />
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<meta name="DC.Relation" scheme="URI" content="rzau9mandrives.htm" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzau9storageoverview" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>iSeries storage
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management overview</title>
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</head>
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<body id="rzau9storageoverview"><a name="rzau9storageoverview"><!-- --></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">iSeries storage
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management overview</h1>
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<div><p>This topic discusses iSeries™ storage management methods.</p>
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<p>When Linux<sup>®</sup> is
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running on the Integrated xSeries<sup>®</sup> hardware, it uses a portion of the iSeries disk
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capacity. For this reason, the administration of a Linux server’s disk storage has both an <span class="keyword">i5/OS™</span> component and a Linux component.
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The <span class="keyword">i5/OS</span> component is
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used to create and link a chunk of storage to the Linux server. The storage management function
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of <span class="keyword">i5/OS</span> relieves the Linux server
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from the responsibility of providing physical device support. Therefore, many
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of the common disk administration tasks encountered in stand-alone PC servers
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(disk drivers, addressing, configuration and protection) are eliminated when
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you use an integrated Linux server. The Linux component of disk storage administration
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is used to perform the remainder of the disk administration tasks, including
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formatting and partitioning. These tasks are performed on an integrated Linux server
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in exactly the same way as they are on a stand-alone Linux server. </p>
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<p>The key to understanding how disk storage is allocated to integrated Linux and Windows<sup>®</sup> servers
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is an understanding of how <span class="keyword">i5/OS</span> storage
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management works on the iSeries. The heart of storage management on the iSeries is
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a technology called single-level storage. Single-level storage is a revolutionary
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storage management architecture that not only gives the iSeries outstanding
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disk I/O performance, but greatly reduces the amount of administration required. </p>
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<p>The major features of single-level storage are:</p>
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<ul><li>Single storage pool <p>The management of physical disk drives is implemented
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in the Systems Licensed Internal Code (SLIC), which is similar in concept
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to the BIOS on a PC. </p>
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<p>By default, the operating system and applications
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see only a single large pool of virtual storage (called the System Auxiliary
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Storage Pool or system ASP) rather than physical drives. Therefore, the management
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of physical storage is hidden from the user. </p>
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<p>To increase the size of
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the pool, simply add disk drives to the iSeries system and they automatically
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become part of the system ASP. Note that under some circumstances you might
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wish to create additional storage pools that are called user ASPs and independent
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ASPs.</p>
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</li>
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<li>Scattering of data<p>Instead of an object being stored on a single physical
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disk drive, single-level storage scatters objects across all physical drives,
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transparently to the user.</p>
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<p>iSeries disk management supports fully
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parallel disk I/O, which provides outstanding disk I/O performance because
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each object on the system is accessible by multiple disk arms concurrently. </p>
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<p>There
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is no need to be concerned about particular disk drives filling up, or moving
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data from one disk to another to improve performance because all data management
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is taken care of by SLIC. Therefore, iSeries does not require a Database Administrator.
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SLIC also ensures that there is no disk fragmentation.</p>
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</li>
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<li>Single address space<p>Memory and disk on iSeries form a single 64-bit address
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space.</p>
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<p>A single address space enables objects to be accessed by name
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rather than hardware address, which provides additional integrity and reliability.</p>
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</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="rzau9mandrives.htm" title="This topic describes information and advice on how to manage iSeries disk storage allocated to integrated Linux servers.">Managing Linux drives</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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