Patent ID: 7203806

Claim:
A storage system, comprising: a virtualization device coupled to an information processing device and having a first controller and at least one virtual volume; said first controller receiving a data input request, which has a first Logical Unit Number (LUN) and data and is sent from said information processing device to said at least one virtual volume, and changing said first LUN included in said data input request into a second LUN of at least one first logical volume in a first storage device based on a relationship between said at least one virtual volume and said at least one first logical volume and relaying said changed data input request to said first logical volume in said first storage device; said first storage device coupled to said virtualization device and having a second controller and a plurality of first disk drives; said second controller receiving said changed data input request from said first controller of said virtualization device and storing said data of said changed data input request in said first disk drives related to said at least one first logical volume; a second storage device having a third controller and a plurality of second disk drives; and said third controller storing data in said second disk drives related to a second logical volume; wherein said first controller receives a command, in which said first LUN and command information is sent from said information processing device to said at least one virtual volume, and changes said first LUN included in said command into said second LUN based on said relationship and relays said changed command to said at least one first logical volume, wherein said second controller receives said changed command from said virtualization device, and wherein said second controller and/or said third controller changes a pair status between said at least one first logical volume and said second logical volume based on said changed command.