Hitachi, Ltd.

Yukihiro Yoshino

Junji Ogawa

Go Uehara

Takaki Matsune

The invention provides a cloud data base system and a data management method that can reorganize a DB without stopping and without affecting business in a cloud. The cloud data base system includes a virtual machine provided by a cloud service, an object storage, and a volume configured to store a DB. When the DB is reorganized, the virtual machine switches an issue destination of an IO from a first pseudo device to a second pseudo device, and causes a replication function to create a replicated volume and causes the first pseudo device to reorganize the DB stored in the replicated volume, while causing the second pseudo device to continue to issue an IO to a replication source volume that is a volume storing the DB.

Cloud data base system and data management method

A higher-level system that inputs and outputs data to/from a storage area including one or more logical areas respectively provided from one or more NVM drives manages the storage area, and manages a plurality of chunks that are a plurality of areas forming the storage area, each of the chunks being a unit of data input/output and being an non-overwritable area. Each of the plurality of chunks has the same chunk size, and each of the plurality of chunks includes a part of each of one or more logical areas. Each of the plurality of chunks includes, for each of the one or more NVM drives, all or part of one or more logical blocks that are one or more ranges corresponding to one or more physical blocks, respectively, but does not include at least a part of a logical block that is entirely or partially included in another chunk.

Growing community of inventors

Tokyo, Japan

Yukihiro Yoshino