US 12,067,297 B2
Storage system and data layout conversion method in storage system
Sachie Tajima, Tokyo (JP); Hideo Saito, Tokyo (JP); Takaki Nakamura, Tokyo (JP); Shintaro Ito, Tokyo (JP); Naruki Kurata, Tokyo (JP); and Takahiro Yamamoto, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 8, 2023, as Appl. No. 18/180,660.
Claims priority of application No. 2022-095168 (JP), filed on Jun. 13, 2022.
Prior Publication US 2023/0401010 A1, Dec. 14, 2023
Int. Cl. G06F 12/00 (2006.01); G06F 3/06 (2006.01)
CPC G06F 3/0661 (2013.01) [G06F 3/061 (2013.01); G06F 3/067 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A storage system comprising:
a plurality of nodes,
wherein the nodes each include
a storage drive, and
a processor that processes data that is to be stored in the storage drive in response to an input/output request from a host,
the processor included in the node creates a redundancy group for forming a redundant configuration of the data to be stored in the storage drive, and stores data of the redundancy group in a plurality of the storage drives, and
when changing a data format of a unit storage area, the processor included in the node
discards data stored in the unit storage area where part of the data of the redundancy group is stored,
based on the data of the redundancy group that is stored in an area other than the unit storage area where the data format is to be changed, recovers the discarded data according to a changed data format and re-stores the recovered data in the storage drive, and
performs an input/output process on the data to be discarded during the data format change, by achieving recovery based on the data of the redundancy group that is stored in an area other than the unit storage area where the data format is to be changed.