Disk array unit

Abstract

A disk array unit connected to a host unit to give information thereto and receive information therefrom. The disk unit includes a plurality of disk units for storing information transmitted from the host unit and a management information recording device, formed by utilizing information storage areas in the disk units, for causing information relating to a logical unit for storing information from the host unit to correspond to information relating to the units. The invention further includes a control unit, when there is no access from the host unit to the logical unit for a predetermined time, for determining the disk units corresponding to the logical unit based on information recorded in the management information recording device and performing power saving of power supply for the disk units.

1 . A disk array unit connected to a host unit to give information thereto and receive information therefrom, said disk array unit comprising
 a plurality of disk units for storing information transmitted from said host unit; and   a management information recording device, formed by utilizing information storage areas in the plurality of disk units, for causing information relating to a logical unit for storing information transmitted from said host unit to correspond to information relating to the plurality of disk units; and   a control unit, when there is no access from said host unit to said logical unit for a predetermined time, for determining said plurality of disk units corresponding to said logical unit based on information recorded in said management information recording device and performing power saving of power supply for said plurality of disk units.