Patent ID: 8762638
Filing Date: 2014-06-24
Classification: G06F

Abstract:
1. A remote copy system, comprising: a first storage system; and a second storage system, which is coupled to the first storage system by way of a communication network, wherein the first storage system has: a first RAID group comprising multiple first storage devices, which constitute the basis of a first logical volume; and a first controller, which is coupled to the first RAID group, the second storage system has: a second RAID group comprising multiple second storage devices, which constitute the basis of a second logical volume; and a second controller, which is coupled to the first controller and the second RAID group, wherein the RAID configuration of the first RAID group and the RAID configuration of the second RAID group are the same, each first storage device forming the first RAID group comprises a first compression/decompression function for compressing write-target data and decompressing read-target compressed data, each second storage device forming the second RAID group comprises a second compression/decompression function for compressing write-target data and decompressing read-target compressed data, the type of the first compression/decompression function and the type of the second compression/decompression function are the same, and in a first remote copy, which is a remote copy of data from the first logical volume to the second logical volume: (A) the first controller reads compressed data from each first storage device by sending to each first storage device forming the first RAID group a read request for reading compressed data without performing decompression with respect to data inside the first logical volume; and (B) the read compressed data is transferred to the second controller via the communication network for each of the first storage devices, and the second controller writes the compressed data to an area of the second storage device corresponding to the second logical volume by sending a write request for writing the compressed data without performing compression to the second storage device, which is in the same location in RAID in the second RAID group as the location in RAID of the first storage device, and the location in RAID is a location of the storage device in the RAID group.