Patent ID: 11886300
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. A backup method for a data replication system comprising a first storage having a first volume for reading and writing data by an external device, and a first data protection area for storing backup images of multiple generations of the first volume and that cannot be accessed by external devices the method comprising the steps of:
coupling a second storage being coupled to the first storage and a host performing data verification; and
coupling a third storage to the first storage,
wherein the first storage creates a second volume for providing a backup image of a particular generation of the multiple generations of the first volume stored in the first data protection area,
wherein the second storage creates a third volume for storing data comprising the backup image of the particular generation of the first volume provided by the second volume,
wherein the third storage:
creates a fourth volume for storing data comprising the backup image of the Particular generation of the first volume;
creates a second virtual volume forming a pair that copies the data comprising the backup image of the particular generation to the fourth volume;
makes the second volume accessible via the second virtual volume by mapping the second virtual volume as an external source and the second volume as an external destination;
reads data of backup image in the second volume through the second virtual volume by copying data from the second virtual volume to the fourth volume; and
stores the data comprising the backup image of the particular generation in the fourth volume.