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For XenServer, you can take a server offline temporarily by using the Maintenance Mode feature in XenCenter. When you place a server into Maintenance Mode, all running VMs are automatically migrated from it to another host in the same pool. If the server is the pool master, a new master will also be selected for the pool. While a server is Maintenance Mode, you cannot create or start any VMs on it. To place a server in Maintenance Mode: In the Resources pane, select the server, then do one of the following: Right-click, then click Enter Maintenance Mode on the shortcut menu. On the Server menu, click Enter Maintenance Mode. Click Enter Maintenance Mode. The server's status in the Resources pane shows when all running VMs have been successfully migrated off the server. To take a server out of Maintenance Mode: In the Resources pane, select the server, then do one of the following: Right-click, then click Exit Maintenance Mode on the shortcut menu. On the Server menu, click Exit Maintenance Mode. Click Exit Maintenance Mode.