Control Device Switching Method, Control Device, and Storage System

A control device switching method includes obtaining, by a first control device, configuration information of a logical unit number (LUN) from a second control device coupled to the first control device, where the LUN is created in a storage device and is accessed by a host through the second control device, providing, by the first control device, a first path to the host based on the configuration information, where the first path is for the host to access the LUN using the first control device, notifying, by the first control device, the second control device to set a second path to be faulty, and switching, by the first control device, a path for the host to access the LUN from the second path to the first path. The second path is for the host to access the LUN using the second control device.