Shared-bandwidth multiple target remote copy

A method for sharing bandwidth in a data processing system having a plurality of locations, wherein the plurality of locations comprises a first location and plurality of further locations, the method comprising:

• receiving a first data element of first data from the first location and other data elements of the first data from the further locations, wherein each data element of the first data is different;
• and
• receiving, after receiving the first data element of the first data from the first location, a message from the first location, wherein the message is sent from the first location separate from the first data element received from the first location, and the message comprises:
• an address of each of the locations of the plurality of locations having one of the data elements of the first data, such that the message includes all of the addresses of all of the locations of the plurality of locations receiving one of the data elements of the first data;
• wherein the first data has been split into the data elements of the first data at a disk level, such that a storage system copying a plurality of disks has split a first half of the disks into a first one of the data elements, and has split a second half of the disks into a second one of the data elements.