68 lines
4.7 KiB
HTML
68 lines
4.7 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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.language" scheme="rfc1766" 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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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-13" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>High availability concepts</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<img src="delta.gif" alt="Start of change" />
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<a name="rzahqhighavailabilityconcepts"></a>
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<h2 id="rzahqhighavailabilityconcepts">High availability concepts</h2>
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<p>iSeries™ and xSeries® integration and storage virtualization provide
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innovative options that can enable you to enhance the reliability and recoverability
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of your Windows server environment. Hosted systems can provide increased availability
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with one or more of the following technologies.</p>
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<p><span class="bold">Hot spare hardware</span></p>
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<p>Hot spare hardware provides a way to quickly recover from certain types
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of hardware failures. This can reduce the server downtime from hours or days
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to minutes. With hosted systems, there are two ways to use hot spare hardware
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to minimize downtime that is caused by hardware failures:</p>
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<ol type="1">
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<li>Hosted system hardware, including Integrated xSeries Servers, xSeries servers that are attached via an Integrated xSeries Adapter, and xSeries or IBM® BladeCenter™ servers that are attached via an
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iSCSI host bus adapter, can be hot spared. If the hardware that is used to
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run the hosted system fails, you can quickly switch the hosted system's
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disk images to compatible spare hardware and restart the hosted system. For
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more information, see <a href="rzahqhotsparebetw.htm#rzahqhotsparebetw">Hot spare between server hardware</a>.</li>
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<li>For iSCSI attached servers, the iSeries target iSCSI host bus adapters (iSCSI
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HBA) can be hot spared. If an iSCSI HBA that a hosted system is using fails,
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you can quickly switch the hosted system to use a spare iSCSI HBA and restart
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the hosted system. For more information, see <a href="rzahqhotsparebetweeniscsi.htm#rzahqhotsparebetweeniscsi">Hot spare between iSCSI local host adapters</a>.</li></ol>
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<p><span class="bold">iSCSI multi-path</span></p>
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<p>A hosted system can use redundant iSCSI data paths to access virtual disks
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hosted by i5/OS™. This is accomplished by defining a group of two or more iSCSI
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HBAs and then specifying that a given virtual disk should be accessed using
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a group, rather than a single iSCSI HBA. With this configuration, the data
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on the virtual disk can be accessed using any of the iSCSI HBAs in the group.</p>
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<p>One advantage of the multi-path configuration is that if one of the iSCSI
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HBAs in the multi-path group fails, the hosted system can continue to access
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the disks that are configured to use the multi-path group uninterrupted, using
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any of the other iSCSI HBAs that are configured in the multi-path group.
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For more information, see <a href="rzahqadvancediscsihardware.htm#rzahqadvancediscsihardware">Advanced iSCSI support</a>.</p>
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<p><span class="bold">Microsoft® Windows Cluster Service (MSCS)</span></p>
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<p>Hosted servers can use MSCS to provide real-time application failover in
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the case of hosted system hardware or software failures. User-initiated failovers
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can be used to take a server offline so that maintenance or backups can be
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performed while the application continues to run on the other server(s) in
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the cluster. For more information, see <a href="rzahqclusterintro.htm#rzahqclusterintro">Windows Cluster Service</a>.</p>
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<p></p><img src="deltaend.gif" alt="End of change" />
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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