Disk array device to copy data between physical block, the disk array controller and method

摘要

According to the embodiment, the disk array controller comprises a data copy unit, and a physical block replacement section. Data copying unit copies the data to the backup logical disk from the master logical disk to the master logical disk and the backup logical disk to the synchronous state. Physical block replacement unit replaces the assigned to the third physical block in place of the second physical block allocated to the first said backup logical disks in the physical block is associated assigned to the master logical disk If the data in said backup logic disks from the first physical block before being copied, assigning the third physical block to said backup logic disks.