Patent ID: 6052797
Filing Date: 2000-04-18
Classification: G06F

Abstract:
A system for automatically providing remote copy data storage, said system comprising:a host computer;a first data storage system including at least a first data storage system controller and at least one data storage device, the first data storage system being coupled to the host computer for storing data to be accessed by at least the host computer; a second data storage system including at least a second data storage system controller and at least one data storage device, the second data storage system being remotely coupled to the first data storage system for copying of said data to the second data storage system controller; andwherein the first data storage system maintains a count of a number of data storage locations which are invalid on the second data storage system, and the first data storage system transmits to the second data storage system the count of the number of data storage locations which are invalid on the second data storage system.