One customer OceanStor V3 OceanStor V3 Controller B shows red light, the the system status indicator lights shows red light.

One customer OceanStor V3 OceanStor V3 Controller B shows red light, the the system status indicator lights shows red light.

The correct way that engineers handle this failure is:
A . Login the management software or the CLI to check the controller is online or not, if not online, re-start the controller B on CLI, observe the start state via CLI, record the start abnormal interface and errors.
B . Login the management software or the CLI to check the controller is online or not, if not online, pull and plug the controller, observe the start state via CLI, record the start abnormal interface and errors.
C . Make serial connection to controller, COM1 port does not have the print; it can be judged as a controller failure, need to be replaced.
D . Login the management software or the CLI to check the controller is online or not, if not online, perform resetsys, re-start the current controller, observe the start state via CLI, record the start abnormal interface and errors.

Answer: A