Patent ID: 7114046
Filing Date: 2006-09-26
Classification: G06F

Abstract:
1. A storage system comprising: a first storage unit for storing data from a first server; a second storage unit for storing the data stored in said first storage unit; a storage controller being coupled with said first storage unit, said second storage unit, said first server, and a second server, and being used to control said first storage unit and said second storage unit, wherein when an instruction for splitting between said first and second storage units is received from said first server, said storage controller reports an end of the splitting to said first server before completing of copying from said first storage unit to said second storage unit, receives an instruction for backup from said second server during the copying from said first storage unit to said second storage unit, and then transfers data to a backup device from said second storage unit after copy of data from said first storage unit to said second storage unit ends based on controlling by said storage controller, wherein if an instruction for backup is issued from said second server after the splitting, then said storage controller checks whether differential data in said first storage unit remains to be backed-up, and wherein if differential data in said first storage unit remains to be backed-up, then said storage controller reflects the differential data in said second storage unit and transfers backed-up data from said second storage unit to said backup device.