Patent ID: 7328320
Filing Date: 2008-02-05
Classification: G06F,Y10S

Abstract:
1. A computer system comprising: a computer having a display to display information of a plurality of backup times, an inputting device by which a user selects a backup time of the plurality of backup times, wherein each of the backup time corresponding to a specific address; a disk array system coupled to the computer and having an interface controller receiving data from the computer, a cache memory temporarily storing data and a disk controller managing data for at least one volume related to a plurality of disk drives, the disk array system managing an address to which the computer can access; wherein the disk array system causes snapshot corresponding to the selected backup time accessible with the specific address to which the computer can access; wherein if the snapshot corresponding to the selected backup time is associated with the specific address to which the computer cannot access, then the disk array system making the snapshot accessible with an address to which the computer can access; wherein the disk array system updates the backup time showing an acquisition time of a snapshot at a time of acquiring the snapshot; and wherein the snapshot relates to differential data between initial backup data and actual backup data at the selected backup time, thereby the acqiuisition time of the snapshot is different than the selected backup time corresponding to the specific address that can be accessed initially by the computer.