Patent ID: 7574575

Claim:
A disk array device comprising: a plurality of storage devices for storing data: a storage device control unit for controlling a data write or read operation to said plurality of storage devices; a connection portion connected to said storage device control unit; a plurality of channel control portions for receiving a write or read request from an external host device, converting file-level data sent from said host device into block-level data, and transferring it to said plurality of storage devices; a cache memory temporarily saving data exchanged between said plurality of channel control portions and said storage device control unit; and a management terminal for setting a logical configuration of said plurality of storage devices, wherein said channel control portions and said storage device control unit form, based on an instruction from the management terminal, a system LU which is a storage region for storing control information in the disk array device itself, a user LU which is a storage region for writing write data sent from said host device and a backup LU which is a storage region for backing up said control information stored in said system LU, wherein said channel control portions, said storage device control unit and said management terminal provide a function to automatically define a path of said backup LU with respect to said system LU and to backup the control information stored in said system LU to said backup LU; wherein the system LU includes an OS storing LU group, a dump pick-up LU group, a command device LU group, a fault information storing LU group, and a cluster-shared information storing LU group, wherein the backup LU includes a backup LU group of the OS storing LU group, a backup LU group of the cluster-shared information storing LU group, a backup LU group of the dump pick-up LU group, a backup LU group of the command device LU group and a backup LU group of the fault storing information LU group, and wherein each of the LUs of each of the LU groups of the system LU is coupled to a respective one of the control channel portions so that each of the control channel portions is coupled to a corresponding LU of one of the LU groups, and wherein deleting any one of the LUs of one of the LU groups of the system LU deletes all of the LUs of said one of the LU groups.