9-13Managing Controllers5 Click OK.Once you have changed the preferred controller, you must assign anew LUN to the array. See Changing the Array LUN on page 3-6.Reactivating the Other ControllerIn active-active mode, when there are two controllers on thestorage system but one controller is offline, the Reactivate OtherController option allows you to bring that controller back online.To reactivate the other controller:1 In the System Browser window, select the active controller.2 Click Reactivate Other Controller.Storage Manager Pro brings the other controller back online.Shutting Down the Other ControllerIn active-active mode, when two controllers are present on thestorage system, you can gracefully shut down one of thecontrollers. Use this option in preparation for power down orreplacement of the other controller. You should always use theShutdown Other Controller option in preference to just turning offthe power. A normal shutdown ensures that the write-back cachehas been flushed to the disk.To shut down one of the controllers:1 In the System Browser window, select the controller you do notwant to shut down.2 Click Shutdown Other Controller.Storage Manager Pro shuts down the controller that is not selected.Shutting Down Both ControllersIn active-active mode, when two controllers are present on thestorage system, you can simultaneously and gracefully shut downboth controllers. Use this option in preparation for a power downof both systems or replacement of both controllers.To shut down both controllers:1 In the System Browser window, select one of the controllers youwant to shut down.
