Patent ID: 8312233
Filing Date: 2012-11-13
Classification: G06F

Abstract:
1. A storage system comprising: a first control unit coupled to a computer; a second control unit coupled to the first control unit and a first storage device that stores data to be used by the computer, and including a processor that processes input/output requests from the computer and a memory that stores first control information indicating a configuration of the first storage device; and a third control unit coupled to the first control unit and a second storage device that stores data to be used by the computer, and including another processor that processes input/output requests from the computer and another memory that stores second control information indicating a configuration of the second storage device, wherein the first control unit receives from the computer a first input/output request including identification information, selects one of the second control unit or the third control unit based on the identification information, and sends a second input/output request corresponding to the first input/output request to the selected one of the second control unit or the third control unit, wherein the processor, included in the second control unit, using the first control information in the memory, controls the second control unit to process input/output requests to the first storage device, wherein the another processor, included in the third control unit, using the second control information in the another memory, controls the third control unit to process input/output requests to the second storage device, wherein the storage system provides a logical volume which corresponds to the first storage device or the second storage device transparent from the computer, wherein the control information comprises: a size storing a capacity of a physical device, a device state setting information indicating a state of the physical device, a RAID configuration retaining information concerning RAID configuration, and a stripe size retaining a length of a data dividing unit (stripe) in the RAID.