Performing a Manual Failover in VS .NET

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Performing a Manual Failover
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Performing a manual failover enables you to test your failover cluster configuration It can also enable you to take a cluster node offline to perform hardware or software maintenance on the node To perform a manual failover, start Failover Management; select Start | Administrative Tools | Failover Cluster Management Failover Cluster Management will be displayed as you can see in Figure 5-6
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Initiating a manual failover
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After Failover Cluster Management is displayed, expand the cluster node, and then open the Services and Applications node Then right-click the SQL Server (MSSQLSERVER) service, and select Move this service or application to another node from the context menu If there are multiple nodes, they will all be displayed in the submenu In this example two-node cluster, there is only one other node To initiate the failover, select the Move to node ORPORTVSQL01 node as illustrated in Figure 5-6 This will display the configuration dialog box that you can see in Figure 5-7 The Please Confirm Action dialog box warns you that you are about to perform a failover Click the Move SQL Server (MSSQLSERVER) to ORPORTVSQL01 option to start the failover When you perform the failover, any clients that are currently connected will be disconnected They can reconnect as soon as the failover has completed
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Performing a Manual Failback
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Performing a manual failback is much like performing a manual failover The only real difference is that you select the original node as the target for the failover option In Failover Cluster Management, either right-click the SQL Server (MSSQLSERVER) service, or select that service and then click the Move this service or application link (obscured in the Actions pane shown in Figure 5-8) Both options are different ways of performing the same task After you select the Move this service or application link, the Please Confirm Action dialog box shown in Figure 5-9 will be displayed
Figure 5-7
Confirming the failover
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Figure 5-8
Confirming the manual failback
The Please Confirm Action dialog box warns you that you are about to perform a failover In this case it is actually a failback to the original node Click the Move SQL Server (MSSQLSERVER) to ORPORTVSQL02 option to start the failover Since a failback is essentially a failover, as before, any clients that are currently connected will be disconnected They can reconnect as soon as the failback has completed
Figure 5-9
Performing a manual failback
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Con guring for Automatic Failback
If you can have a specific cluster node that you prefer to run the clustered SQL Server service, you can set up a preferred owner for the clustered service This will enable the clustered service to run on the preferred node In the event of a failure on the preferred node, failover clustering will failover the service to one of the backup nodes Later when the node that has been designated as the preferred one comes back online, failover clustering will automatically failback the clustered service to the preferred owner node To set up a node as the preferred owner, choose Start | Administrative Tools | Failover Cluster Management to open Failover Cluster Management, as shown in Figure 5-10 To specify a node as the preferred owner, expand the cluster, expand the Services and Applications node, right-click the SQL Server (MSSQLSERVER) service, and select Properties from the context menu This will display the cluster s properties dialog box, which you can see in Figure 5-11 To set a node as the preferred owner, open the Properties dialog box s General tab, and select the node on the Preferred Owners list that you want to act as the preferred owner of the SQL Server service In Figure 5-11 you can see that I selected node ORPORTVSQL01 to be the preferred owner of the service
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