US 11,675,523 B2
Remote copy of compressed journal data and corresponding metadata
Akira Deguchi, Tokyo (JP); Nobuhiro Yokoi, Tokyo (JP); and Hiroka Ihara, Tokyo (JP)
Assigned to Hitachi, Ltd., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Sep. 10, 2021, as Appl. No. 17/471,575.
Claims priority of application No. JP2021-031882 (JP), filed on Mar. 1, 2021.
Prior Publication US 2022/0276785 A1, Sep. 1, 2022
Int. Cl. G06F 3/06 (2006.01)
CPC G06F 3/065 (2013.01) [G06F 3/061 (2013.01); G06F 3/0683 (2013.01)] 17 Claims
OG exemplary drawing
 
17. A remote copy method performed by a primary storage system having a primary volume and a secondary storage system including a secondary volume configuring a volume pair with the primary volume, the method comprising:
associating journal data with metadata that includes a write order of the journal data, the journal data being a copy of data written in the primary volume;
performing, by the primary storage system, collective compression of data that i) is at least a part of a plurality of pieces of the journal data in a plurality of journals and ii) is larger than a size of one journal data,
wherein i) collectively compressed data which is the data that has been collectively compressed and ii) a plurality of pieces of metadata corresponding to the collectively compressed data are transfer targets from the primary storage system to the secondary storage system; and
acquiring, by the secondary storage system, a second plurality of pieces of journal data by decompressing one or more pieces of the collectively compressed data received from the primary storage system, and writing the second plurality of pieces of journal data to the secondary volume according to the write order represented by each of the plurality of pieces of the metadata that are received from the primary storage system.