Abstract: In a storage system, a first loop and a second loop are connected to a controller, and at least one of the first loop and the second loop is connected to existing storage devices (which are physical storage devices other than additional storage devices, which are physical storage devices which are additionally provided). In processing for additional provision, after having disconnected all of the existing storage devices from the first loop, the controller connects an additional storage device to the first loop. And the controller acquires, via said first loop, an address acquired by this additional storage device, and makes a first suitability decision as to whether or not this address is appropriate. And, if the result of this first suitability decision is negative, then the controller blocks up this additional storage device whose address has been acquired.

Abstract: In a storage system, a first loop and a second loop are connected to a controller, and at least one of the first loop and the second loop is connected to existing storage devices (which are physical storage devices other than additional storage devices, which are physical storage devices which are additionally provided). In processing for additional provision, after having disconnected all of the existing storage devices from the first loop, the controller connects an additional storage device to the first loop. And the controller acquires, via said first loop, an address acquired by this additional storage device, and makes a first suitability decision as to whether or not this address is appropriate. And, if the result of this first suitability decision is negative, then the controller blocks up this additional storage device whose address has been acquired.