The disk array subsystem, and distributed methods in a disk array subsystem, a control method, program

摘要

A disk array subsystem including D disk apparatuses, wherein, there is a redundancy of N (N is an integer equal to or larger than 3), the disk array subsystem includes data regions of each of the disk apparatuses and (N-1) copy regions on each of the disk apparatuses, first copies of data to be stored in the data regions of each of the disk apparatuses are to be distributedly arranged in first copy regions of each of the disk apparatuses other than a disk apparatus from which the copies of data are to be distributedly arranged, and second copies of data to be stored in each of the first copy regions of each of the disk apparatuses are to be distributedly arranged, with respect to each of the first copy regions of each of the disk apparatuses, in second copy regions of each of the disk apparatuses other than a disk apparatus from which the second copies of data are to be distributedly arranged, and any of a disk apparatus that any of original data of the second copies are to be stored in the data region.