70 lines
4.7 KiB
HTML
70 lines
4.7 KiB
HTML
<?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="task" />
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<meta name="DC.Title" content="Switchover" />
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<meta name="abstract" content="Switchover happens when you manually switch access to a resource from one server to another." />
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<meta name="description" content="Switchover happens when you manually switch access to a resource from one server to another." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsevents.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsfailover.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptsrecoverydomain.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigmanageperformswitchover.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rzaigconceptsswitchover" />
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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>Switchover</title>
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</head>
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<body id="rzaigconceptsswitchover"><a name="rzaigconceptsswitchover"><!-- --></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">Switchover</h1>
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<div><p><dfn class="term">Switchover</dfn> happens when you manually
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switch access to a resource from one server to another.</p>
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<div class="section"><p>You usually initiate a manual switchover if you wanted to perform
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system maintenance, such as applying program temporary fixes (PTFs), installing
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a new release, or upgrading your system. Contrast this with a failover, which
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happens automatically when a outage occurs on the primary node.</p>
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<p>When
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a switchover occurs, access is switched from the cluster node currently acting
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as the primary node in the recovery domain of the cluster resource group to
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the cluster node designated as the first backup. See recovery domain for information
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on how the switchover order is determined.</p>
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<p>If you are doing an administrative
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switchover of multiple CRGs, the order you specify should consider the relationships
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between the CRGs. For example, if you have an application CRG that depends
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on data associated with a device CRG, the steps to an ordered switchover are:</p>
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</div>
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<ol><li><span>Stop the application on the old primary node (to quiesce changes
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to the data).</span></li>
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<li><span>Switch the device CRG to the new primary node.</span></li>
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<li><span>Switch the application CRG to the new primary node.</span></li>
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<li><span>Restart the application on the new primary node.</span></li>
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</ol>
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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> <img src="./delta.gif" alt="Start of change" /><a href="rzaigconceptsevents.htm" title="Within a cluster several types events, actions, and services can occur.">Cluster events</a><img src="./deltaend.gif" alt="End of change" /></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaigconceptsfailover.htm" title="Failover occurs when a server in a cluster automatically switches over to one or more backup servers in the event of a system failure.">Failover</a></div>
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<div><a href="rzaigconceptsrecoverydomain.htm" title="A recovery domain is a subset of cluster nodes that are grouped together in a cluster resource group (CRG) for a common purpose such as performing a recovery action or synchronizing events.">Recovery domain</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaigmanageperformswitchover.htm" title="Performing a manual switchover causes the current primary node to switch over to the backup node, as defined in the cluster resource group's recovery domain.">Perform a switchover</a></div>
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</div>
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</div>
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</body>
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</html> |