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<h1 class="topictitle1">Create a cluster</h1>
<div><p>To create and configure a cluster, you need to include at least
one node in the cluster and you must have access to at least one of the nodes
that will be in the cluster.</p>
<div class="section"><p><img src="./delta.gif" alt="Start of change" />If only one node is specified, it must be the server
that you are currently accessing. For a complete list of requirement for creating
clusters, see the <a href="rzaigconfigchecklist.htm">Cluster configuration checklist</a>.<img src="./deltaend.gif" alt="End of change" /></p>
<p>If
you will be using switchable devices in your cluster, there are additional
requirements than that of a cluster that does not use switchable devices.
To set up a cluster environment that includes switchable devices, care must
be taken so that conflicts are avoided across the cluster. See <a href="../rzaly/rzalycreateswitchableiasp.htm">Create
a switchable independent disk pool</a> for step-by-step instructions on
how to configure a cluster to use switchable devices.</p>
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<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigconfigure.htm" title="Understand how to go about creating a cluster.">Configure clusters</a></div>
</div>
</div><div class="nested1" xml:lang="en-us" id="usingiseries"><a name="usingiseries"><!-- --></a><h2 class="topictitle2">Using iSeries Navigator</h2>
<div><div class="section"><p>This requires <a href="rzaigplanoption41.htm">Option 41 (HA Switchable Resources)</a> to be installed and
licensed.</p>
<p>iSeries™ Navigator
cluster management features a wizard that takes you through the steps to create
and start a simple cluster consisting of one or two cluster nodes. Once you
have created a one- or two-node cluster, you can add nodes to it. A cluster
created and managed in iSeries Navigator can contain as many as four nodes.
This wizard will guide you through the steps to specify servers to include
and create cluster resource groups. When you are creating a simple cluster,
the server you are creating the cluster on must be one of the nodes.</p>
<p>To
create a simple cluster using the New Cluster wizard in iSeries Navigator,
follow these steps:</p>
</div>
<ol><li><span>In iSeries Navigator,
expand <span class="uicontrol">Management Central</span>.</span></li>
<li><span>Right-click <span class="uicontrol">Clusters</span>, and select <span class="uicontrol">New
Cluster</span>.</span></li>
<li><span>Follow the wizard's instructions to create a cluster.</span></li>
</ol>
<div class="section"><p>Once you have created the cluster, be sure to:</p>
<ol><li>Add all of the nodes that you want to include in the cluster. Up to four
nodes can be added to a cluster created and managed in iSeries Navigator.</li>
<li>Add desired nodes to device domains (for use with switchable hardware
groups and independent disk pools).</li>
<li>Create and start the switchable resources (switchable device, switchable
application, and switchable data).</li>
</ol>
<p>The online help in iSeries Navigator contains step-by-step procedures
on completing these tasks.</p>
</div>
</div>
</div>
<div class="nested1" xml:lang="en-us" id="usingclcmdsapis"><a name="usingclcmdsapis"><!-- --></a><h2 class="topictitle2">Using CL commands and APIs</h2>
<div><div class="section">You can also use CL commands or APIs to create a cluster:</div>
<ol><li class="stepexpand"><span><span class="uicontrol">Create the cluster.</span></span> <ul class="simple"><li><a href="../cl/crtclu.htm"><span class="cmdname">Create Cluster (CRTCLU)</span> command</a></li>
<li><a href="../apis/clcntcrtc.htm"><span class="apiname">Create Cluster
(QcstCreateCluster)</span> API</a></li>
</ul>
</li>
<li class="stepexpand"><span><span class="uicontrol">Add nodes to your cluster from the active cluster node.</span></span> <ul class="simple"><li><a href="../cl/addclunode.htm"><span class="cmdname">Add Cluster
Node Entry (ADDCLUNODE)</span> command</a></li>
<li><a href="../apis/clcntaddcne.htm"><span class="apiname">Add Cluster
Node Entry (QcstAddClusterNodeEntry)</span> API</a></li>
</ul>
</li>
<li class="stepexpand"><img src="./delta.gif" alt="Start of change" /><span><span class="uicontrol">Start a cluster node.</span></span> <ul class="simple"><li><a href="../cl/strclunod.htm"><span class="cmdname">Start
Cluster Node (STRCLUNOD)</span> command</a></li>
<li><a href="../apis/clcntstcn.htm"><span class="apiname">Start
Cluster Node (QcstStartClusterNode)</span> API</a></li>
</ul>
<img src="./deltaend.gif" alt="End of change" /></li>
<li class="stepexpand"><span><span class="uicontrol">Define device domains.</span> If you plan to use
switchable devices, you must include the desired nodes in the device domain.</span> <ul class="simple"><li><a href="../cl/adddevdmne.htm"><span class="cmdname">Add Device Domain
Entry (ADDDEVDMNE)</span> command</a></li>
<li><a href="../apis/clcntadddde.htm"><span class="apiname">Add Device
Domain Entry (QcstAddDeviceDomainEntry)</span> API</a></li>
</ul>
</li>
<li class="stepexpand"><span><span class="uicontrol">Create cluster resource groups (CRG).</span></span> <ul class="simple"><li><a href="../cl/crtcrg.htm"><span class="cmdname">Create Cluster Resource
Group (CRTCRG)</span> command</a></li>
<li><a href="../apis/clrgcrtcrg.htm"><span class="apiname">Create Cluster
Resource Group (QcstCreateClusterResourceGroup)</span> API</a></li>
</ul>
</li>
<li class="stepexpand"><span><span class="uicontrol">Start the cluster resource groups (CRG).</span></span> <ul class="simple"><li><a href="../cl/strcrg.htm"><span class="cmdname">Start Cluster Resource
Group (STRCRG)</span> command</a></li>
<li><a href="../apis/clrgstcrg.htm"><span class="apiname">Start Cluster
Resource Group (QcstStartClusterResourceGroup)</span> API</a></li>
</ul>
</li>
</ol>
</div>
</div>
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