US 11,886,300 B2
Data duplication system and backup method
Shunsuke Nishiyama, Tokyo (JP); Kenichi Oyamada, Tokyo (JP); Hiroki Mera, Tokyo (JP); and Goro Kazama, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Aug. 11, 2022, as Appl. No. 17/886,394.
Claims priority of application No. 2021-199786 (JP), filed on Dec. 9, 2021.
Prior Publication US 2023/0185673 A1, Jun. 15, 2023
Int. Cl. G06F 12/00 (2006.01); G06F 11/14 (2006.01)
CPC G06F 11/1458 (2013.01) [G06F 11/1451 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A data duplication 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; and
a second storage being coupled to the first storage,
wherein the first storage creates a second volume for providing backup image of a particular generation of the multiple generations of the first volume stored in the first data protection area, and
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;
creates a first virtual volume forming a pair that copies the data of the backup image of the particular generation to the third volume;
makes the second volume accessible via the first virtual volume by mapping the first virtual volume as an external source and the second volume as an external destination;
reads a backup image of the second volume through the first virtual volume by copying data from the first virtual volume to the third volume; and
stores the data comprising the backup image of the particular generation of the first volume in said third volume by writing to said third volume.