Patent ID: 7802131

Claim:
An information system, comprising: a computer as a host system; a first storage apparatus coupled to said computer and including a first primary volume and a first secondary volume; 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, and 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; a third storage apparatus coupled to said first storage apparatus and including a third volume constituted of a storage area provided by a mounted Hard Disk Drive (HDD); and a fourth storage apparatus coupled to said second storage apparatus and including a fourth volume constituted of a storage area provided by a mounted HDD; wherein said first and second secondary volumes are virtual volumes mapped to said third or fourth volume, and wherein said first and second storage apparatuses respectively copy said data to be copied to said first or second secondary volume to said third or fourth volume.