Log in to either the Dell Storage Manager or the Enterprise Manager.
Click Hardware tab, and expand the Controller from the left pane.
Right-click the Upper Controller and click Shutdown/Restart Controller.
If you wish to restart the lower controller, then right-click the Lower Controller.
In the Shutdown/Restart Controller window, select Restart the controller from the pulldown menu and click OK
Now the controller restart.
Click OK when you see "The upper (or lower) controller have been restarted successfully." message on the screen.
Click Summary tab on the Dell Storage Manager or Enterprise Manager.
If the message "The controller port of this Storage Center is currently unadjusted due to the failover." appears, click the Readjust port.
Readjustment starts.
Check the status after the readjustment completed.
In case the screen is not refreshed, click the Refresh on the screen several times.