Patent ID: 7900083

Claim:
A disk array apparatus comprising: a plurality of disks; an error table storing information indicating occurrence of an error in the plurality of disks for each kind of error which can occur; a statistical score addition table storing a number of scores according to the error which occurs in the plurality of disks and on the read and write paths to the plurality of disks; and a control unit, wherein the control unit judges, when an error occurs, whether or not information indicating the occurrence of the error is stored in the error table for the kind of the error, wherein the control unit adds, when the information is not stored, first number of scores to a disk in which the error occurs, adds second number of scores smaller than the first number of scores to a path to the disk in which the error occurs in the statistical score addition table, and store information indicating the occurrence of the error for the disk in which the error occurs in the error table for the kind of the error, wherein the control unit adds, when the information is stored, the first number of scores to the disk in which the error occurs, adds third number of scores larger than the first number of scores to the path to the disk in which the error occurs in the statistical score addition table, and store the information indicating the occurrence of the error for the disk in which the error occurs in the error table for the kind of the error, and wherein the control unit separates a path or disk of which a number of scores exceeds a predetermined threshold in the statistical score addition table from the disk array apparatus.