Patent ID: 7315960
Filing Date: 2008-01-01
Classification: G06F

Abstract:
1. A system comprising: a computer; a primary storage system; a secondary storage system; and a standby storage system, wherein said computer, said primary storage system, said secondary storage system and said standby storage system are connected to each other by a network, wherein said primary storage system performs a remote copy by performing a write in response to a write request from said computer via said network, and transferring a write command to said secondary storage system via said network, wherein said computer sends the write request to said primary storage system, checks whether the write request has terminated in said primary storage system, and judges whether an error has occurred in said primary storage system or said secondary storage system if the write request has not terminated, wherein, if the error has occurred in said primary storage system, then said computer changes said standby storage system into a new secondary storage system, changes said secondary storage system into a new primary storage system and re-sends the write request to said new primary storage system, and wherein, if the error has occurred in said secondary storage system, then said computer changes said standby storage system into a new secondary storage system and re-sends the write request to said primary storage system.