Patent ID: 7219201
Filing Date: 2007-05-15
Classification: G06F

Abstract:
1. A storage system, comprising: a first storage device coupled to a first information processing device and having a first controller and a plurality of first disk drives, a first portion of said first disk drives being related to a first logical volume and a second portion of said first disk drives being related to a second logical volume; said first controller having a first information indicating that said first logical volume functions as a primary logical volume and a second information indicating that said second logical volume functions as a logical volume being used to transfer data; said first controller receiving data, which are sent from said first information processing device and are targeted to said first logical volume, and storing data corresponding to said data sent from said first information processing device in said first portion of said first disk drives and storing data corresponding to said data sent from said first information processing device in said second portion of said first disk drives and transferring data corresponding to said data stored in said second portion of said first disk drives to a second storage device; said second storage device coupled to a second information processing device and said first storage device and having a second controller and a plurality of second disk drives, a third portion of said second disk drives being related to a third logical volume and a fourth portion of said second disk drives being related to a fourth logical volume; said second controller having a third information indicating that said third logical volume functions as a logical volume being used to receive data and a fourth information indicating that said fourth logical volume functions as a secondary logical volume forming a pair relationship with said primary logical volume; and said second controller receiving said data transferred from said first controller and storing data corresponding to said data transferred from said first controller in said third portion of said second storage device and storing data corresponding to said data stored in said third portion of said second disk drives in said fourth portion of said second storage device; wherein said first storage device and said second storage device change said first information, said second information, said third information and said fourth information based on at least one command sent from said second information processing device so that said second information processing device sends data targeted to said fourth logical volume, if said first information processing device has a failure wherein said changed first information indicates that said first logical volume now functions as said secondary logical volume, wherein said changed second information indicates that said second logical volume now functions as said logical volume being used to receive data, wherein said changed third information indicates that said third logical volume now functions as said logical volume being used to transfer data, and wherein said changed fourth information indicates that said fourth logical volume now functions as said primary logical volume.