Patent ID: 8090979

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 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 at least one of said first and second storage apparatuses executes local copy of copying said data written into said first or second primary volume in a self-storage apparatus to corresponding said first or second secondary volume, wherein said computer switches the destination of a write request of said 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.