US 11,704,337 B2
Storage system and data replication method in storage system
Takaki Matsushita, Tokyo (JP); Yusuke Yamaga, Tokyo (JP); and Akira Deguchi, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 25, 2021, as Appl. No. 17/212,250.
Application 17/212,250 is a continuation of application No. 17/025,197, filed on Sep. 18, 2020, granted, now 10,963,485.
Claims priority of application No. 2020-130440 (JP), filed on Jul. 31, 2020.
Prior Publication US 2022/0035833 A1, Feb. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 16/27 (2019.01); G06F 3/06 (2006.01)
CPC G06F 16/27 (2019.01) [G06F 3/065 (2013.01); G06F 3/0647 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A storage system, comprising:
a plurality of controllers and capable of creating a snapshot, which is a replication of a logical volume,
wherein the logical volume or the snapshot to be handled by a controller of the plurality of controllers is assigned to the controller,
wherein a log structured area which stores data of the logical volume or the snapshot, and a meta information area which stores meta information of the data appended to the log structured area, are assigned to the controller,
wherein the controller comprises a data control unit which appends the data of the logical volume to the log structured area, and a data management unit which stores the meta information of the data appended to the log structured area by the data control unit in the meta information area,
wherein the meta information is composed of meta information of a first tier and meta information of a second tier which correlate location information of the data in the logical volume and location information of the data in the log structured area,
wherein the meta information of the first tier is information which correlates the location information of the data in the logical volume and a storage location of the meta information of the second tier related to that data, and the meta information of the second tier is information which manages the location information of the data in the log structured area,
wherein the logical volume, or the log structured area and the logical volume storing the data of the snapshot, or the meta information area storing the meta information of the data of the snapshot, is assigned to a plurality of data storage volumes, and
wherein the meta information of the first tier and the meta information of the second tier are respectively distributed and arranged in the plurality of data storage volumes.