Disk array apparatus that avoids premature declarations of faults

摘要

A disk array apparatus includes a detection unit, delay unit, instruction issue unit, first determination unit, and assignment unit. The detection unit detects a faulty magnetic disk device delayed in response to a read instruction from a host device out of a plurality of magnetic disk devices constituting an array. The delay unit outputs a delay signal on the basis of an output from the detection unit. The instruction issue unit issues a retry instruction to the faulty magnetic disk device on the basis of the delay signal from the delay unit. The first determination unit determines in response to the retry instruction from the instruction issue unit whether the faulty magnetic disk device normally ends read processing. The assignment unit assigns a defective alternate block to the faulty magnetic disk device when the determination result of the first determination unit does not represent a normal processing end.