Patent ID: 7765370

Claim:
A computer system storing data on multiple storage systems, said computer system comprising: a primary storage system that is connected to a first computer that executes prescribed work processing and stores data used when the first computer is executing said work processing; a secondary storage system that is connected to a second computer that executes said work processing in place of said first computer and stores data used when said second computer is executing said work processing; an intermediate storage system that is connected to said primary and secondary storage systems and stores received data; wherein said computer system has a first remote copy status and a second remote copy status; wherein, in said first remote copy status, said first computer processes a first copy and a second copy, said first copy includes that said primary storage system copies the data stored therein into said intermediate storage system via synchronous copying for storage therein, said second copy includes that said intermediate storage system copies the copied data to said secondary storage system via asynchronous copying for storage therein; wherein, in said second remote copy status, said second computer processes a third copy and a fourth copy, said third copy includes that said secondary storage system copies the data stored therein into said intermediate storage system via asynchronous copying for storage therein, said fourth copy includes that said intermediate storage system copies the copied data to said primary storage system via synchronous copying for storage therein, and wherein, in said second remote copy status, said fourth copy status is suspend when said third copy status is duplex, and said third copy status is suspend when said fourth copy status is duplex.