99 lines
6.6 KiB
HTML
99 lines
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HTML
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<meta name="DC.Title" content="Tips: Cluster partitions" />
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<meta name="abstract" content="Use these tips for cluster partitions." />
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<title>Tips: Cluster partitions</title>
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<body id="rzaigtroubleshoottipclusterpartitions"><a name="rzaigtroubleshoottipclusterpartitions"><!-- --></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">Tips: Cluster partitions</h1>
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<div><p>Use these tips for cluster partitions.</p>
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<ol><li class="stepexpand"><span>The rules for restricting operations within a partition are designed
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to make merging the partitions feasible. Without these restrictions, reconstructing
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the cluster requires extensive work.</span></li>
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<li class="stepexpand"><span>If the nodes in the primary partition have been destroyed, special
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processing may be necessary in a secondary partition. The most common scenario
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that causes this condition is the loss of the site that made up the
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primary partition. Use the example in recovering from partition errors and
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assume that Partition 1 was destroyed. In this case, the primary node for
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Cluster Resource Groups B, C, and D must be located in Partition 2. The simplest
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recovery is to use Change Cluster Node Entry to set both Node A and Node B
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to failed. See changing partitioned nodes to failed for more information about
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how to do this. Recovery can also be achieved manually. In order to do this,
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perform these operations:</span><ol type="a"><li><span>Remove Nodes A and B from the cluster in Partition 2. Partition
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2 is now the cluster.</span></li>
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<li><span>Establish any logical replication environments needed in the new cluster.
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IE. Start Cluster Resource Group API/CL command, and so on.</span></li>
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</ol>
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<p>Since nodes have been removed from the cluster definition in Partition
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2, an attempt to merge Partition 1 and Partition 2 will fail. In order to
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correct the mismatch in cluster definitions, run the <a href="../apis/clcntdltc.htm"><span class="apiname">Delete Cluster (QcstDeleteCluster)</span> API</a> on
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each node in Partition 1. Then add the nodes from Partition 1 to the cluster,
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and reestablish all the cluster resource group definitions, recovery domains,
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and logical replication. This requires a great deal of work and is also prone to errors.
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It is very important that you do this procedure only in a site loss situation.</p>
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</li>
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<li class="stepexpand"><span>Processing a start node operation is dependent on the status of
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the node that is being started: </span> <p>The node either failed or an
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End Node operation ended the node:</p>
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<ol type="a"><li><span>Cluster resource services is started on the node that is being
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added</span></li>
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<li><span>Cluster definition is copied from an active node in the cluster
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to the node that is being started.</span></li>
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<li><span>Any cluster resource group that has the node being started in
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the recovery domain is copied from an active node in the cluster to the node
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being started. No cluster resource groups are copied from the node that is
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being started to an active node in the cluster.</span></li>
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</ol>
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<p>The node is a partitioned node:</p>
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<ol type="a"><li><span>The cluster definition of an active node is compared to the
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cluster definition of the node that is being started. If the definitions are
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the same, the start will continue as a merge operation. If the definitions
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do not match, the merge will stop, and the user will need to intervene.</span></li>
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<li><span>If the merge continues, the node that is being started is set
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to an active status.</span></li>
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<li><span>Any cluster resource group that has the node being started in
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the recovery domain is copied from the primary partition of the cluster resource
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group to the secondary partition of the cluster resource group. Cluster resource
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groups may be copied from the node that is being started to nodes that are
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already active in the cluster.</span></li>
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</ol>
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</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> <a href="rzaigtroubleshootpartitionerrors.htm" title="Certain cluster conditions are easily corrected. If a cluster partition has occurred, you can learn how to recover. This topic also tells you how to avoid a cluster partition and gives you an example of how to merge partitions back together.">Partition errors</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="rzaigtroubleshootchangepartitionednodes.htm" title="Sometimes, a partitioned condition is reported when there really was a node outage. This can occur when cluster resource services loses communications with one or more nodes, but cannot detect if the nodes are still operational. When this condition occurs, a simple mechanism exists for you to indicate that the node has failed.">Change partitioned nodes to failed</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/clcntdltc.htm">Delete Cluster (QcstDeleteCluster) API</a></div>
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</div>
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</div>
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