77 lines
5.6 KiB
HTML
77 lines
5.6 KiB
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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Device domains" />
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<meta name="abstract" content="A device domain is a subset of nodes in a cluster that share device resources. More specifically, nodes in a device domain can participate in a switching action for some collection of resilient device resources." />
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<meta name="description" content="A device domain is a subset of nodes in a cluster that share device resources. More specifically, nodes in a device domain can participate in a switching action for some collection of resilient device resources." />
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<meta name="DC.Relation" scheme="URI" content="rzaigconceptselements.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigplanoption41.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaigscenariosswitcheddiskiasp.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rzaigconceptsdevicedomain" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Device domains</title>
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</head>
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<body id="rzaigconceptsdevicedomain"><a name="rzaigconceptsdevicedomain"><!-- --></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">Device domains</h1>
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<div><p>A <dfn class="term">device domain</dfn> is a subset of nodes in a cluster
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that share device resources. More specifically, nodes in a device domain can
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participate in a switching action for some collection of resilient device
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resources.</p>
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<p>Device domains are identified and managed through a set of interfaces that
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allow you to add a node to a device domain or remove a node from a device
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domain.</p>
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<p>Device domains are used to manage certain global information necessary
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to switch a resilient device from one node to another. All nodes in the device
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domain need this information to ensure that no conflicts occur when devices
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are switched. For example, for a collection of switchable independent disk
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pools, the independent disk pool identification, disk unit assignments, and
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virtual address assignments must be unique across the entire device domain.</p>
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<br /><img src="rzaig502.gif" alt="A data CRG featuring a device domain and an external expansion unit" /><br /><p>A cluster node can belong to at most one device domain. Before a node can
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be added to the recovery domain for a device CRG, the node must be first defined
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as a member of a device domain. All nodes that will be in the recovery domain
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for a device CRG must be in the same device domain.</p>
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<p>To create and manage device domains, you must have Option 41 (<span class="keyword">i5/OS™</span> - HA Switchable Resources)
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installed and a valid license key on your system.</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="rzaigplanoption41.htm">Option 41 (HA Switchable Resources)</a></strong><br />
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To create and manage device domains, you must have
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Option 41 (<span class="keyword">i5/OS</span> - HA Switchable
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Resources) installed and a valid license key on your system.</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="rzaigconceptselements.htm" title="An iSeries cluster is a collection of one or more systems or partitions that work together as a single system. Use this information to understand the elements and their relationship to each other.">The elements of a cluster</a></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="rzaigscenariosswitcheddiskiasp.htm" title="A cluster using switched disk technology provides an alternative to having the data replicated. In a switched disk cluster, the data is actually contained in independent disk pools (also referred to as independent ASPs).">Example: A switched disk cluster using independent disk pools</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="rzaigmanageaddnodedevicedomain.htm" title="A device domain is a subset of nodes in a cluster that share device resources.">Add a node to a device domain</a></div>
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<div><a href="rzaigmanageremovenodedevicedomain.htm" title="A device domain is a subset of nodes in a cluster that share device resources.">Remove a node from a device domain</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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