Patent ID: 7167962

Claim:
A remote copy method performed among a plurality of storage sub-systems comprising: receiving a position information specifying a location of a logical volume of a first storage sub-system thereby to transmit data in a location specified by said position information from said first storage sub-system to a logical volume of a second storage sub-system; storing in said second storage sub-system said data in said location transmitted from said first storage sub-system in said logical volume of said second storage sub-system; storing transfer states on transmitting of said data in said location in said logical volume of said second storage sub-system; issuing an inquiry of transfer states to other storage sub-systems under transmitting of said data in said location in a logical volume of said other storage sub-systems; and updating, in response to a result of said inquiry of transfer states to said other storage sub-system, transfer states for transmitting of said position information to said other storage sub-systems.