Patent ID: 8386839

Claim:
An information system, comprising; a computer; a first storage apparatus coupled to said computer and including a first primary volume and a first secondary volume; and a second storage apparatus coupled to a said first storage apparatus and said computer and including a second primary volume and a second secondary volume, wherein said first and second storage apparatuses execute remote copy of copying data written into said first primary volume from said computer to said second primary volume, wherein, if the first storage apparatus receives a pair operation command, the first storage apparatus executes pair operation to the first primary volume and the second primary volume and sends the pair operation command to the second storage apparatus, and the second storage apparatus executes pair operation to the first secondary volume and the second secondary volume based on the pair operation command sent from the first storage apparatus, wherein said computer switches a destination of a write request of data from said first storage apparatus to said second storage apparatus in case of a failure occurring in said first storage apparatus, wherein the first storage apparatus includes a first processor and the second storage apparatus includes a second processor, wherein the first processor sends a copy pair status of the local copy to the second processor, and wherein the second processor judges whether or not the pair status is about the second storage apparatus and refers to management information about the remote copy.