A storage system in which a management computer and a host computer are connected to one or more storage apparatuses via a data communication line, wherein: the one or more storage apparatuses are configured to provide the management computer with at least one first volume for storing data from the management computer, and to provide the host computer with at least one second volume for storing data from the host computer, and wherein the management computer is configured: to store a first storage information including an identifier of the first volume which is recognized by an OS of the management computer; to manage a volume address for the one or more storage apparatuses to manage the first volume by referring to the first storage information; and to issue a storage control command specifying an arbitrary volume address to the one or more storage apparatuses, characterized in that the management computer is configured: to store a second storage information including an identifier of the second volume which is not recognized by an OS of the management computer; to issue an I/O request from the management computer to the storage apparatus, the I/O request including the identifier of the first volume as an address of the I/O request and including the identifier of the second volume as an access target, to determine the presence or absence of the logical volume not recognized by the OS in the management computer based on the presence or absence of a normal response from the storage apparatus to the storage control command, the normal response being defined as indicating the existence of the volume not recognized by the OS of the management computer; to identify the logical volume not recognized by the OS of the management computer in line with the volumes recognized and managed by the OS in the management computer; and to create, when receiving the normal response from the arbitrary volume address, the second storage information containing the volume with the arbitrary volume address as the second volume; and that the storage apparatus is configured, depending on the presence or absence of a normal response, to receive the I/O request by reference to the identifier of the first volume in the first storage information; and to handle the copy related I/O request by reference to the identifier of the second volume in the second storage information. the one or more storage apparatuses are configured to provide the management computer with at least one first volume for storing data from the management computer, and to provide the host computer with at least one second volume for storing data from the host computer, and wherein to store a first storage information including an identifier of the first volume which is recognized by an OS of the management computer; to manage a volume address for the one or more storage apparatuses to manage the first volume by referring to the first storage information; and to issue a storage control command specifying an arbitrary volume address to the one or more storage apparatuses, to store a second storage information including an identifier of the second volume which is not recognized by an OS of the management computer; to issue an I/O request from the management computer to the storage apparatus, the I/O request including the identifier of the first volume as an address of the I/O request and including the identifier of the second volume as an access target, to determine the presence or absence of the logical volume not recognized by the OS in the management computer based on the presence or absence of a normal response from the storage apparatus to the storage control command, the normal response being defined as indicating the existence of the volume not recognized by the OS of the management computer; to identify the logical volume not recognized by the OS of the management computer in line with the volumes recognized and managed by the OS in the management computer; and to create, when receiving the normal response from the arbitrary volume address, the second storage information containing the volume with the arbitrary volume address as the second volume; and that the storage apparatus is configured, depending on the presence or absence of a normal response, to receive the I/O request by reference to the identifier of the first volume in the first storage information; and to handle the copy related I/O request by reference to the identifier of the second volume in the second storage information.