METHOD AND APPARATUS FOR CONTROLLING DASD

摘要

PURPOSE: To optimize data transfer between a CPU with high performance and a DASD array, and the possibility of the usage of the DASD. CONSTITUTION: Access to logical tracks in KN pieces of blocks is managed by using K as the number of parity blocks. The KN pieces of blocks are dispersed to the arrays of N pieces of DASD having K pieces of blocks for one physical track of one DASD, and stored. The blocks are formatted to the array using the modulars of line measure order as a scale for balancing a data transfer ratio and concurrency (the number of the DASD connected by each access), and both the large amounts of access demands and the small amounts of access demands lined in random are executed for the array.