Dell PowerConnect W Clearpass 100 Software 3.9 Deployment Guide - Page 438
Performing Scheduled Maintenance, Updating Plugins, Destroying a Cluster, Show details, Local, Status
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A similar procedure can be used to rebuild the cluster in the event of a secondary node suffering a hardware failure. Performing Scheduled Maintenance Routine maintenance tasks such as a server reboot or shutdown may occasionally be required for a server that is part of a cluster. These tasks may be performed by ensuring that the server is the secondary node in the cluster. If the secondary node goes offline, the primary node will be unaffected and the cluster will continue to provide network services without interruption. When the secondary node comes back online, the cluster will be automatically rebuilt and replication will resume. To check the current status of a node, log into that node and click the Show details link displayed with the cluster status on the High Availability page. The node's current status is displayed under the Local Status heading. Use this procedure to make the current primary node the secondary node: 1. Log into the current secondary node of the cluster. 2. Click Cluster Maintenance, and then click the Swap Primary Server command link. 3. A progress meter is displayed while the primary node is switched. The cluster's virtual IP address will be temporarily unavailable while the swap takes place. 4. The swap is complete. The secondary node is now the new primary node for the cluster. The cluster is back in a fault-tolerant mode of operation. 5. Perform any required maintenance on the new secondary node. Updating Plugins Plugins cannot be updated while High Availability is running. Because exact synchronization of the two servers is required for High Availability Services, you must first destroy the cluster, then re-create the cluster after the plugins are updated. See Destroying a Cluster and Cluster Setup in this chapter. For information on updating plugins, see Plugin Manager in the Administrator Tasks chapter. Destroying a Cluster The Destroy Cluster command link is used to shut down a cluster and return to independent nodes. Avoid using this command when you are accessing the cluster using its virtual IP address, as the virtual IP address will no longer be available when the cluster has been destroyed. 438 | High Availability Services ClearPass Guest 3.9 | Deployment Guide