Patent ID: 7073090

Claim:
A remote copy system for automatically providing a remote copy of data from a host computer, said system comprising: a first data storage system including a first data storage system controller and at least one first data storage device, the first data storage system controller having a first cache memory, the first data storage system controller receiving the data from the host computer and initially storing the data in the first cache memory and subsequently writing the data into said at least one first data storage device; a second data storage system located remote from the first data storage system, the second data storage system including a second data storage system controller and at least one second data storage device, the second data storage system controller having a second cache memory; and a communication link coupling the first data storage system controller to the second data storage system controller for transferring the data from the first data storage system controller to the second data storage system controller, the second data storage system controller storing the data in the second cache memory, and writing the data into said at least one second data storage device; wherein the first data storage system controller includes a first remote link adapter coupled between the first cache memory and the communications link for transferring the data to the communications link, and the second data storage system controller includes a second remote link adapter coupled between the communications link and the second cache memory for transferring the data from the communications link to the second cache memory, whereby the first remote link adapter and the second remote link adapter automatically transfer the data to the second cache memory for writing of the data into said at least one second data storage device.