A remote copy system includes a plurality of first storage systems and a
plurality of second storage systems. Each first storage system assigns a
sequential number to write data received from the host and sends the
write data with the sequential number to the second storage system. One
of the first storage systems defers the processing of the write request
received from the host and instructs each of the first storage systems to
create a marker, whereupon each of the first storage systems defers the
processing of the write request, creates a marker including a sequential
number and having a marker number, and sends the marker to the second
storage system.