Patent ID: 7669016
Filing Date: 2010-02-23
Classification: G06F,Y02D

Abstract:
1. A storage system coupled to a computer, comprising: an interface coupled to the computer; a plurality of disk drives; and a control unit, coupled to the interface and the plurality of disk drives, providing for the computer a plurality of virtual volumes, wherein said storage system has a first mapping in which a first one of said virtual volumes is mapped to a first logical volume and a second mapping in which said first virtual volume is mapped to a second logical volume, said first and second logical volumes are configured by the plurality of disk drives and stored with data of different contents, wherein after the interface receives a command for accessing to the first virtual volume from the computer, the control unit converts the command for accessing to the first virtual volume into a second command for accessing to the first logical volume and executes the second command for accessing to the first logical volume in the first mapping, and the control unit converts the command for accessing to the first virtual volume into a third command for accessing to the second logical volume and executes the third command for accessing to the second logical volume in the second mapping, and wherein, when said storage system receives a write command for changing from the first mapping into the second mapping from the computer to a second virtual volume, the control unit changes said storage system from the first mapping into the second mapping.