Patent ID: 7133989

Claim:
An information handling system for providing a point in time copy of data between a source data storage system and a target data storage system, comprising: a peer-to-peer communication link interface of said target data storage system for linking said target data storage system to said source data storage system; data storage of said target data storage system for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface; a table of said target data storage system establishing information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information of said table may reference the one of said data storage systems having requested point in time copy data; and a controller of said target data storage system accessing requested point in time copy data at said target data storage system if said information of said table indicates that said requested point in time copy data is available at said target data storage system; else obtaining said requested point in time copy data from said source data storage system via said peer-to-peer communication link interface.