US 11,836,391 B2
Distributed storage system and storage control method
Hiroto Ebara, Tokyo (JP); Akira Yamamoto, Tokyo (JP); Yoshinori Ohira, Tokyo (JP); Masakuni Agetsuma, Tokyo (JP); Makio Mizuno, Tokyo (JP); and Takahiro Yamamoto, Tokyo (JP)
Assigned to Hitachi, Ltd., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 11, 2022, as Appl. No. 17/692,269.
Claims priority of application No. 2021-176767 (JP), filed on Oct. 28, 2021.
Prior Publication US 2023/0135652 A1, May 4, 2023
Int. Cl. G06F 3/06 (2006.01)
CPC G06F 3/067 (2013.01) [G06F 3/0604 (2013.01); G06F 3/0655 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A distributed storage system comprising:
a plurality of storage units that each include a plurality of physical storage devices; and
a computer connected to the plurality of storage units via a communication network, wherein
when receiving a write request for a logical volume, the computer writes write data corresponding to the write request and redundant data for making the write data redundant in the plurality of storage units in a distributed manner, and collectively controls writing of a journal of write data for managing a write history of the write data and a journal of redundant data for managing a write history of the redundant data, and
when receiving the write request, the computer generates a guarantee code for confirming that the write data does not change until the write data is read, and writes the write data and a corresponding guarantee code in a continuous area in a respective physical storage device.