A disk array apparatus capable of reducing a disk drive fault rate where a
time-out failure has occurred. The disk array apparatus includes a
plurality of disk drives, and a control unit for performing data
input/output processing of the disk drives in response to a data
input/output request from a host system. The control unit includes: a
memory for storing control information for specifying a failure of at
least one of the disk drives, and failure information of the faulty disk
drive, a circuit for specifying, from the failure information, the disk
drive in which a time-out failure has occurred, and issuing an
instruction to retry a control command to the disk drive, and a circuit
for outputting a control signal to the faulty disk drive in order to hard
reset the disk drive if the disk drive does not recover from the failure.