148 lines
9.9 KiB
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148 lines
9.9 KiB
HTML
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<meta name="DC.Title" content="Determine primary and secondary cluster partitions" />
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<meta name="abstract" content="In order to determine the types of cluster resource group actions that you can take within a cluster partition, you need to know whether the partition is a primary or a secondary cluster partition. When a partition is detected, each partition is designated as a primary or secondary partition for each cluster resource group defined in the cluster." />
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<title>Determine primary and secondary cluster partitions</title>
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<body id="rzaigtroubleshootdeterminepartitions"><a name="rzaigtroubleshootdeterminepartitions"><!-- --></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">Determine primary and secondary cluster partitions</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />In order to determine the types of cluster resource
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group actions that you can take within a cluster partition, you need to know
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whether the partition is a primary or a secondary cluster partition. When
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a partition is detected, each partition is designated as a primary or secondary
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partition for each cluster resource group defined in the cluster.<img src="./deltaend.gif" alt="End of change" /></span></p>
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<p><img src="./delta.gif" alt="Start of change" />For primary-backup model, the primary partition contains
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the node that has the current node role of primary. All other partitions are
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secondary. The primary partition may not be the same for all cluster resource
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groups. <img src="./deltaend.gif" alt="End of change" /></p>
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<div class="p"><img src="./delta.gif" alt="Start of change" />A peer model has the following partition rules: <ul><li>If the recovery domain nodes are fully contained within one partition,
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it will be the primary partition. </li>
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<li>If the recovery domain nodes span a partition, there will be no primary
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partition. Both partitions will be secondary partitions. </li>
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<li>If the cluster resource group is active and there are no peer nodes in
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the given partition, the cluster resource group will be ended in that partition.</li>
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<li>Operational changes are allowed in a secondary partition as long as the
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restrictions for the operational changes are met.</li>
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<li>No configuration changes are allowed in a secondary partition. </li>
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</ul>
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<img src="./deltaend.gif" alt="End of change" /></div>
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<p>The restrictions for each Cluster Resource Group API are:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Cluster Resource Group API Partition Restrictions</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e40">Cluster Resource Group API</th>
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<th valign="top" width="25%" id="d0e42">Allowed in primary partition</th>
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<th valign="top" width="25%" id="d0e44">Allowed in secondary partitions</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Add Node to Recovery Domain</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Add CRG Device Entry</span></td>
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<td valign="top" width="25%" headers="d0e42 "> </td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Change Cluster Resource Group</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Change CRG Device Entry</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 ">X</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Create Cluster Resource Group</span></td>
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<td valign="top" width="25%" headers="d0e42 "> </td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Delete Cluster Resource Group</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 ">X</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Distribute Information</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 ">X</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">End Cluster Resource Group</span><sup>1</sup></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Initiate Switchover</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">List Cluster Resource Groups</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 ">X</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">List Cluster Resource Group Information</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 ">X</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Remove Node from Recovery Domain</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Remove CRG Device Entry</span></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e40 "><span class="apiname">Start Cluster Resource Group</span><sup>1</sup></td>
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<td valign="top" width="25%" headers="d0e42 ">X</td>
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<td valign="top" width="25%" headers="d0e44 "> </td>
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</tr>
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<tr><td colspan="3" valign="top" headers="d0e40 d0e42 d0e44 "><div class="note"><span class="notetitle">Note:</span> <ol><li>Allowed in all partitions for peer cluster resource groups, but only affects
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the partition running the API.</li>
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</ol>
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</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>By applying these restrictions, cluster resource groups can be synchronized
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when the cluster is no longer partitioned. As nodes rejoin the cluster from
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a partitioned status, the version of the cluster resource group in the primary
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partition is copied to nodes from a secondary partition.</p>
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<p><img src="./delta.gif" alt="Start of change" />When merging two secondary partitions for peer model, the
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partition which has cluster resource group with status of Active will be declared
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the winner. If both partitions have the same status for cluster resource group,
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the partition which contains the first node listed in the cluster resource
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group recovery domain will be declared the winner. The version of the cluster
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resource group in the winning partition will be copied to nodes in another
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partition.<img src="./deltaend.gif" alt="End of change" /></p>
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<p>When a partition is detected, the <span class="apiname">Add Cluster Node Entry</span>, <span class="apiname">Adjust
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Cluster Version</span>, and the <span class="apiname">Create Cluster</span> API cannot
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be run in any of the partitions. The <span class="apiname">Add Device Domain Entry</span> API
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can only be run if none of the nodes in the device domain are partitioned.
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All of the other Cluster Control APIs may be run in any partition. However,
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the action performed by the API takes affect only in the partition running
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the API.</p>
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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>
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