Patent ID: 8396835
Filing Date: 2013-03-12
Classification: G06F

Abstract:
1. A computer system, comprising: a first storage system connected to a network; and a second storage system connected to the first storage system; wherein the first storage system includes a first physical storage device configured to store data and a first controller configured to control writing and reading of data into and from the first physical storage device; wherein the second storage system includes a second physical storage device configured to store data and a second controller configured to control writing and reading of data into and from the second physical storage device, wherein the second controller is configured to manage a storage area of the second physical storage device as a plurality of logical volumes, including a third logical volume and a fourth logical volume, wherein the first controller is configured to manage a storage area of the first physical storage device as a plurality of logical volumes, including a first logical volume and a second logical volume, a first virtualized logical volume virtualized in correspondence with the third logical volume, and a second virtualized logical volume virtualized in correspondence with the fourth logical volume, wherein the first logical volume is configured to store data that are designated in an access request from a host computer connected to the network, the second logical volume is configured to store journal data related to the first volume and the journal data related to the first volume, including first differential data as a differential of data that are stored in the first logical volume at a first time and data that are stored in the first logical volume at a second time that is later than the first time; wherein the first controller is configured to copy backup data among data belonging to the first logical volume to the first virtualized logical volume, send the backup data to the second storage system, and upon subsequently receiving the backup data from the second storage system, compress the received backup data, encrypt the compressed backup data, store the encrypted backup data to the second virtualized logical volume; and send the backup data encrypted after the compression to the second storage system, and wherein, upon receiving the backup data from the first storage system, the second controller is configured to store the backup data in the third logical volume, thereafter send the backup data stored in the third logical volume to the first storage system, and upon receiving the data encrypted after the compression from the first storage system, store the received backup data in the fourth logical volume.