(57) ABSTRACT A method of managing data by a storage system having? rst and second
volumes according to a command from a server computer, including receiving a data access
command from the server computer; specifying a data area that is designated in the data
access command and reading data in the data area from the? rst volume; judging Whether
the data access com mand contains a data evacuating instruction; judging Whether the data
in the data area has been evacuated to the second volume When the data read command …