METHOD FOR KEEPING SEEK AFFINITY AND WRITING SENSITIVITY, METHOD FOR DESTAGING DATA OF PLURAL TRACKS AND DASD SUBSYSTEM

摘要

PURPOSE: To provide a method for accessing a system management storing device so as to keep seek affinity and writing sensitivity to be advantageous by writing plural blocks from a buffer at the position of a DASD array so that the blocks may be provided with the same redundant group affinity and stored on the same corresponding DASD cylinder. ;CONSTITUTION: An array control unit 2 is provided with a directory provided in a directory memory 10 and showing mapping from a logical data block to a physical data block, a means forming a block group with a logical affinity and calculating a redundant code concerning this group, a buffer 15 keeping a corrected data block and paths 7 and 19. Writing from the buffer 15 to a DASD array 8 is executed by writing a block from the buffer 15 to a new DASD position on the same cylinder and writing as 'update at the site' to a DASD cylinder addressed from the buffer 15.;COPYRIGHT: (C)1995,JPO