Arrangements for controlling the updating of a storage device, which investigates the number of times that a lock waiting time exceeds an upper limit value to judge whether or not the number of times that the upper limit value has been exceeded exceeds a frequency threshold value; stops the reception of write requests by the file system if the result of this judgment is affirmative; and stops the copy-on-write by cutting off the logical connection between the primary storage device and the secondary storage device.