Patent ID: 7506118

Claim:
A storage control subsystem connected to an external device, the external device constituting a host or another storage control subsystem, the storage control system comprising: a plurality of second logical volumes constituting a copy destination that correspond with a plurality of first logical volumes constituting a copy source a memory for storing online information indicating whether each second logical volume is in an online state and path information representing a path between the second logical volume in the online state and another host connected to the second logical volume; and a control unit for performing a first examination of whether one or more of the second logical volumes are in an online state based on the online information prior to data copying from one or more first logical volumes of the plurality of first logical volumes to the one or more second logical volumes of the plurality of second logical volumes, wherein when it is found that at least one of the one or more second logical volumes is in an online state as a result of the first examination, the control unit places the at least one or more second logical volume volumes in the online state in an offline state if forced cancellation of the online state is designated and, if no such forced cancellation is designated, the control unit performs a second examination as to which other host the one or more second logical volumes are connected to by using path information of the one or more second logical volumes and transmits the result of the second examination to the host.