A method and a system for locking a storage area in a storage system. There is provided a method for locking a storage system in a storage system, where the storage system comprises a first controller, a second controller, a first communication area and a second communication area. The method comprises: a first lock flag associated with the storage area is written to the first communication area in response to receiving at the first controller a data access request with respect to the storage area, where the first communication area being readable and writable to the first controller and being readable to the second controller. A second lock flag associated with the storage area is read from the second communication area, where the second communication area being readable to the first controller and being readable and writable to the second controller. The storage area is locked by the first controller in response to the second lock flag indicating that the storage area is not locked by the second controller.