Patent ID: 8929018
Filing Date: 2015-01-06
Classification: G06F,G11B,Y02D

Abstract:
1. A storage system coupled to a host computer, the storage system comprising: a plurality of disk units forming a first RAID group, storing data, and being capable of being brought into at least one power saving mode; a spare disk unit which substitutes for a faulty disk unit of the plurality of disk units belonging to the first RAID group when a fault occurs in the faulty disk unit; and a controller for providing a logical unit (LU) set on the first RAID group for the host computer and controlling an access request designating the LU on the first RAID group and storing data of the access request distributed to the plurality of disk units forming the first RAID group, wherein the controller is configured to receive a command for setting a predetermined period to the first RAID group so that the plurality of disk units forming the first RAID group are brought into the at least one power saving mode if the predetermined period elapses from receiving a last access request to the first RAID group.