The process of switching a service group involves taking it offline on its current system and bringing it online on another system.
To switch a service group
In the Service Groups tab of the Cluster Explorer configuration tree, right-click the service group.
Select the cluster in the Cluster Explorer configuration tree, select the Service Groups tab, and right-click the service group icon in the view panel.
Choose Switch To, and choose the appropriate system from the pop-up menu (Right-click>Switch To>system_name).