73 lines
4.3 KiB
HTML
73 lines
4.3 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="DC.Type" content="topic" />
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<meta name="DC.Title" content="Examples: Switchable independent disk pools" />
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<meta name="DC.Relation" scheme="URI" content="rzalyscenarios.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalyexampleswitchabletower.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzalyexampleswitchableioplpar.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2002, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzalyswitchableiasps" />
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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>Examples: Switchable independent disk pools </title>
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</head>
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<body id="rzalyswitchableiasps"><a name="rzalyswitchableiasps"><!-- --></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">Examples: Switchable independent disk pools </h1>
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<div><p>In a multisystem environment, an independent disk pool can be switched
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between servers in a cluster. A switchable independent disk pool is a set
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of disk units that you can switch between servers so that each server can
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access the data. Only one system can access the data at a time.</p>
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<p>Switchable independent disk pools can reside on one of two types of switchable
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hardware devices:</p>
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<dl><dt class="dlterm">External expansion unit</dt>
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<dd>The switchable device can be an external expansion unit connected to
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the clustered servers on the same high-speed link (HSL) loop.</dd>
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<dt class="dlterm"> Input/output processor (IOP) in a logical partition</dt>
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<dd>In an LPAR environment, the switchable device can be an
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IOP on the bus shared by the partitions or in an I/O pool.</dd>
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</dl>
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<p>The entity that switches is actually the expansion unit or the IOP containing
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the independent disk pool. When an expansion unit or IOP is switched, all
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of the hardware attached to the switchable entity is moved to the backup
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system.</p>
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<p>The following example configurations and scenario illustrate some typical
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switchable independent disk pools implementations: </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="rzalyexampleswitchabletower.htm">Example: Switchable expansion unit</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyexampleswitchableioplpar.htm">Example: Switchable IOP with logical partitions</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyexampleswitchabletowerlpar.htm">Example: Switchable expansion unit with logical partitions</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyexamplebranchiasps.htm">Scenario: Consolidate servers using switchable independent disk pools</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyexamplegeomirror.htm">Example: Independent disk pools with geographic mirroring</a></strong><br />
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</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="rzalyscenarios.htm">Examples: Independent disk pool configurations</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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