Fail Over a Controller Using the GUI

Failover requires one controller to be in Active mode and the other controller to be in Standby mode.

A failover switches management of the array from the active controller to the standby controller.

  1. Perform one of the following steps based on your NimbleOS version.
    1. In the NimbleOS GUI for version 3.x, choose Manage → Arrays.
    2. In the NimbleOS GUI for version 4.x, choose Hardware.
  2. From the list of arrays, click the array you want to fail over.
  3. In the Array view, note which controller is Active and which is Standby.
  4. Click Make Active on the Standby controller.
  5. In the confirmation dialog box, click Yes.
During the failover operation, the standby controller first goes into Solo mode, and then into Active mode. The active controller goes into Unknown mode, then into Stale mode, and finally into Standby mode.