Patent ID: 8719220
Filing Date: 2014-05-06
Classification: G06F

Abstract:
1. A computer system for storing data, comprising: a first storage device including a first volume; a second storage device including a second volume; a third storage device including a third volume; wherein the second storage device is configured to store a data difference information to identify difference data between data stored in the second storage device and data stored in the third storage device, wherein the third storage device is configured to copy all data stored in the third volume in the third storage device to the first volume in the first storage device, wherein the second storage device is configured to copy the difference data from the second storage device to the first volume in the first storage device by identifying the difference data based on the data difference information, and wherein the first storage device is configured to store the data copied from the third volume in the third storage device to the first volume and merge the difference data copied from the second storage device to the stored data in the first volume.