You might need to replace the E2800 controller if it is not functioning optimally or if it has failed.
The appliance Storage Node will not be accessible when you replace the controller. If the E2800 controller is functioning sufficiently, you can place the E5700SG controller into maintenance mode. Before changing the link configuration, you must place the E5700SG controller controller into maintenance mode. Putting a StorageGRID appliance into maintenance mode might make the appliance unavailable for remote access.
When you replace a controller, you must remove the battery from the original controller and install it in the replacement controller.