Patent ID: 8725981
Filing Date: 2014-05-13
Classification: G06F

Abstract:
1. A storage system for storing data written from a computer, the storage system comprising: a memory medium that provides a physical memory area for the data; and a control device that controls data input to the memory medium and data output from the memory medium, wherein a part of the physical memory area is provided by the control device to the computer as a first logical volume, wherein another part of the physical memory area is allocated to a pool region under the management of the control device, and wherein the control device is configured to: when receiving a write request to write to the first logical volume from the computer, store write data accompanied with the write request into the first logical volume, when receiving a first-generation snapshot creation request, copy all of the data stored in the first logical volume into the pool region as data corresponding to a first-generation snapshot, and when receiving a second-generation snapshot creation request after receiving the first-generation snapshot creation request, copy a part of the data stored in the first logical volume into the pool region as data corresponding to a second-generation snapshot, the part of the data being updated during between the first-generation snapshot creation and the second-generation snapshot creation.