Managing the Cluster in Visual Studio .NET

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Managing the Cluster
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While a Windows failover cluster provides high availability in the event of unplanned downtime, at times you may need to bring the clustered application offline to perform troubleshooting or other infrastructure maintenance activities In addition, managing a clustered application has different aspects than managing a regular application For example, you can pause and resume clustered applications without stopping them Additionally, if you want to perform planned maintenance on one or more of the cluster nodes, you can manually initiate a failover, switching the support for the application from the primary node to one of the backup nodes
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Bringing a Clustered Service Of ine
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Bringing a clustered service or application offline stops the application No clients can connect to the application when it is stopped You may want to stop the application in order to perform cluster maintenance or to implement a complete application update To bring a clustered application offline, start Failover Cluster Management by choosing Start | Administrative Tools | Failover Cluster Management To take the clustered SQL Server offline, expand the cluster node, and then expand the Services and Applications node Next, right-click the SQL Server (MSSQLSERVER) service, and select the Take this service or application offline option, as illustrated in Figure 5-1 After selecting the Take this service or application offline option, you are presented with the warning dialog box that you can see in Figure 5-2 The Please Confirm Action dialog box warns you that if you continue, the clustered SQL Server service (MSSQLSERVER) will no longer be available To proceed and take the service offline, select the Take SQL Server (MSSQLSERVER) offline option This will stop the MSSQLSERVER service on the cluster, and no clients will be able to reconnect until the service has been brought back online
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Taking a clustered application offline
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Bringing a Clustered Service Back Online
To bring a clustered application back online, start Failover Cluster Management by choosing Start | Administrative Tools | Failover Cluster Management This will display Failover Cluster Management, as shown in Figure 5-3 Expand the cluster node and then expand the Services and Applications node The SQL Server (MSSQLSERVER) service should be displayed with a red down arrow This indicates that the service is offline To bring the SQL Server service back online, right-click the SQL Server (MSSQLSERVER) service, and then select Bring this service or application online from the context menu After the service is online, it will be displayed in Failover Cluster Management with a small, gray gear icon indicating the service is active At this point clients will be able to reconnect to the service
Pausing a Node
Pausing and resuming a node is used for node maintenance where you need to apply software updates to a node but you want the node resources groups to stay online Pausing a node allows the cluster resources to stay online, but additional resources cannot be brought online until the node is resumed In this scenario you would typically pause the node, move the resources to another node, update the node, and then resume the node
Figure 5-3
Bringing the clustered service back online
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Figure 5-4
Pausing a cluster node
To pause a clustered node, start Failover Cluster Management; choose Start | Administrative Tools | Failover Cluster Management This will display Failover Cluster Management, as shown in Figure 5-4 Expand the cluster node, then expand Nodes, and right-click the node that you want to pause From the context menu select Pause, as demonstrated in Figure 5-4 The node status displayed in the Summary pane will be changed to Paused
Resuming a Node
To resume the node, choose Start | Administrative Tools | Failover Cluster Management to start Failover Cluster Management Expand the cluster node, expand Nodes, and right-click the node that you want to resume From the context menu select Resume, as demonstrated in Figure 5-5
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