68 lines
4.8 KiB
HTML
68 lines
4.8 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Resilient devices" />
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<meta name="abstract" content="Resilient devices are physical resources, represented by a configuration object, such as a device description, that are accessible from more than one node in a cluster." />
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<meta name="description" content="Resilient devices are physical resources, represented by a configuration object, such as a device description, that are accessible from more than one node in a cluster." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Resilient devices</title>
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</head>
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<body id="rzaigconceptsresilientdevices"><a name="rzaigconceptsresilientdevices"><!-- --></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">Resilient devices</h1>
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<div><p><dfn class="term">Resilient devices</dfn> are physical resources, represented
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by a configuration object, such as a device description, that are accessible
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from more than one node in a cluster.</p>
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<p><img src="./delta.gif" alt="Start of change" />In the event of an outage, the point of access for the resource
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is switched to the first backup node in the cluster resource group recovery
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domain. Independent disk pools, or independent ASPs are resilient devices
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that can go offline or come online without impacting the rest of system storage.
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Additionally you can use geographic mirroring which is a subfunction of cross-site
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mirroring (XSM) which is part of i5/OS™ Option 41, High Available Switchable
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Resources. Geographic mirroring is a function that keeps two identical copies
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of an independent disk pool at two sites to provide high availability and
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disaster recovery. The copy owned by the primary node is the production copy
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and the copy owned by a backup node at the other site is the mirror copy.
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User operations and applications access the independent disk pool on the primary
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node, the node that owns the production copy. <img src="./deltaend.gif" alt="End of change" /></p>
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<p>A <dfn class="term">resilient device cluster resource group</dfn> can contain a list
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of switchable devices. Each device in the list identifies a switchable independent
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disk pool. The entire collection of devices are switched to the backup node
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when an outage occurs. Optionally, the devices can also be varied on as part
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of the switchover/failover process. There are limitations related to the physical
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configuration associated with the list of switchable devices. See <a href="../rzaly/rzalyoverview.htm">Independent disk pools</a> for
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more information about how to set up the appropriate configuration for an
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independent disk pool defined to be resilient.</p>
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<p>A resilient device CRG is very similar to the other types of CRGs. One
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difference, the list of switchable devices, was mentioned above. Another difference
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is that the exit program is optional for a device CRG. If environment or data
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specific processing is needed, an exit program can be used for the CRG. See
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the <a href="../apis/clrgcrtcrg.htm"><span class="apiname">Create
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Cluster Resource Group (QcstCreateClusterResourceGroup)</span> API </a> for
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additional information about this type of CRG.</p>
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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="rzaigconceptsresilientresources.htm" title="Resilient resources are system resources, such as data, devices and applications, that are highly available if you have used clustering on your systems.">Resilient resources</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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