Patent ID: 8694749
Filing Date: 2014-04-08
Classification: G06F

Abstract:
1. A storage system, comprising: a first storage device coupled to a first computer; a second storage device coupled to the first computer and a second computer; and a third storage device coupled to the first storage device and the second storage device, wherein the first storage device comprises a first logical device, the second storage device comprises a second logical device, and the third storage device comprises a third logical device, wherein the third logical device is associated with a physical storage area storing data used by the first computer, wherein the first storage device comprises a first virtualization unit and the second storage device comprises a second virtualization unit, wherein the first virtualization unit of the first storage device associates the third logical device of the third storage device with the first logical device, and provides the third logical device to the first computer as the first logical device of the first storage device, wherein when the second storage device receives from the second computer an instruction to migrate the first logical device of the first storage device to the second storage device, the second virtualization unit of the second storage unit associates the first logical device with the second logical device, acquires attribute information set for the first logical device from the first storage device, sets the acquired attribute information to the second logical device, and provides the second logical device of the second storage device, said second logical device virtualizing the first logical device, to the first computer, wherein when an access path to the second logical device of the second storage device is set as an alternative path to an access path to the first logical device of the first storage device in the first computer, the first storage device stops receiving an input/output request from the first computer so that the input/output request is transmitted from the first computer to the second logical device of the second storage device, and wherein the second virtualization unit of the second storage device associates the third logical device of the third storage device with the second logical device, and provides the third logical device to the first computer as the second logical device of the second storage device.