The embodiment of the invention provides a disk array implementing method, a data read-write method and a device. The method comprises the steps of: establishing logistic regions according to the amount of controllers in controller groups, wherein each logistic region corresponds to a controller in one controller group; recording mapping relation between the logistic regions and the controller toa controller mapping table, assigning data blocks for the logistic region in a physical magnetic disc supervised by the controller in the controller group corresponding to each logistic region according to setting a disc choosing strategy, and recording the mapping relation between the logistic regions and the data blocks to a data block mapping table. In the embodiment of the invention, through setting the data block in the physical magnetic disc supervised by the controller corresponding to each logistic region in the same controller group, the logistic region of each controller can be operated at the same time, and the variation of the mapping relation is little, thereby the extended operation can be easily completed.