STORAGE UNIT CONTROLLER AND CACHE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To solve the problem that when access requests distributed to respective controllers conflict due to exclusive control in acquiring cache blocks, waiting time is required since only one controller conducts data transfer by occupying the whole area of the cache block. SOLUTION: This cache control method manages use state of cache blocks using shared memories which can be accessed from each controller in order to perform exclusive control in which both controllers can transfer data to the same cache block unless the domains of data transfer overlap even if it is the same cache block. COPYRIGHT: (C)2007,JPO&INPIT