A storage system has a host computer and a storage control device connected thereto.
The system controls duplication of data in a first logical volume to be stored
in real-time in a second logical volume different therefrom, and makes a logical
volume identifier and a data set identifier for the first volume described in the
first volume's management information and a logical volume identifier and a data
set identifier for the second volume described in the second volume's management
information match during the duplication. The system generates a control program
for setting the first volume's logical volume identifier and data set identifier
in the first volume's management information and the second volume's logical volume
identifier and data set identifier in the second volume's management information
to differ and, by executing this program, makes the second volume be recognized
by an OS as a volume independent of the first volume.
