93 lines
5.2 KiB
HTML
93 lines
5.2 KiB
HTML
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<title>Create a switchable hardware group</title>
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<body id="rzalycreatecrg"><a name="rzalycreatecrg"><!-- --></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">Create a switchable hardware group</h1>
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<div><p>A switchable hardware group, also known as a device cluster resource group
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(CRG), contains a list of switchable devices. Each device in the list identifies
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a switchable independent disk pool. The entire collection of devices are
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switched to the backup node when an outage, planned or unplanned, occurs.
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Optionally, the devices can also be made available (varied on) as part of
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the switchover or failover process.</p>
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<p>A switchable hardware group identifies a device domain. A device domain
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is a subset of cluster nodes that share a set of resilient devices. The device
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domain is created automatically when you use the iSeries™ Navigator wizard to create a
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cluster. If you are using cluster CL commands and APIs, you must add each
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node that you want to be switchable to the device domain. </p>
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<dl><dt class="dlterm"><strong>Using iSeries Navigator</strong> (requires <a href="../rzaig/rzaigplanoption41.htm">Option 41
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(i5/OS™ -
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HA Switchable Resources)</a>)</dt>
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<dd>The New Switchable Hardware Group wizard will take you through the steps
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to create a new switchable hardware group and add a disk pool to it for the
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cluster. <div class="p">To add a switchable hardware group, follow these steps: <ol><li>In iSeries Navigator,
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expand <strong>Management Central</strong>. </li>
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<li>Expand <strong>Clusters</strong>. </li>
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<li>Expand the cluster for which you need to add a switchable hardware group.</li>
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<li>Right-click <strong>Switchable Hardware</strong>, and select <strong>New Group.</strong> </li>
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<li>By default the New Disk Pool wizard creates a protected disk pool that
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allows you to choose how you want to protect the disk units. You can use
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device parity protection, mirrored protection, or a combination of both.
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After the disk pool is created, you are prompted to start disk unit mirroring.
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This ensures that if you make changes to your disk pool configuration, it
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will remain protected. You can also create an unprotected disk pool by unchecking
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the protection option.</li>
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</ol>
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</div>
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<div class="note"><span class="notetitle">Note:</span> Make sure that all the nodes in the recovery domain are
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started.</div>
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</dd>
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</dl>
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<div class="section"><h4 class="sectiontitle">Using Cluster CL commands and APIs</h4><p>You can also
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use the following to add a device domain entry and create a device cluster
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resource group:</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Add Device Domain Entry</h4><p>Adds a node to a device
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domain membership list so that it can participate in recovery actions for
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resilient devices. The addition of the first node to a device domain has
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the effect of creating that device domain. </p>
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<ul><li><a href="../cl/adddevdmne.htm">ADDDEVDMNE
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(Add Device Domain Entry) Command</a></li>
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<li><a href="../apis/clcntadddde.htm">Add Device
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Domain Entry (QcstAddDeviceDomainEntry) API</a> </li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Create Cluster Resource Group</h4><p>Creates a cluster
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resource group object. The cluster resource group object identifies a recovery
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domain, which is a set of nodes in the cluster that will play a role in recovery.</p>
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<ul><li><a href="../cl/crtcrg.htm">CRTCRG (Create
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Cluster Resource Group) Command</a></li>
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<li><a href="../apis/clrgcrtcrg.htm">Create
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Cluster Resource Group (QcstCreateClusterResourceGroup) API</a> </li>
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</ul>
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</div>
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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="rzalycreateswitchableiasp.htm">Create a switchable independent disk pool</a></div>
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</div>
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</div>
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</body>
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