公开(公告)号：US20200264806A1

公开(公告)日：2020-08-20

申请号：US16577569

申请日：2019-09-20

Applicant: HITACHI, Ltd.

Inventor： Erina NOGI ,  Jun MIYASHITA ,  Akihiro SHIKANO

IPC: G06F3/06 ,  G06F13/16

Abstract: Each node constituting a distributed storage system includes one or more controllers. Each controller includes an actual queue group for each drive physically coupled to the controller, and a virtual queue group for each of a plurality of drives. A Drive-IO issued by any controller and received is accumulated in the actual queue group corresponding to an issue destination drive of the Drive-IO after accumulated in the virtual queue group corresponding to the issue destination drive.

公开(公告)号：US20250044968A1

公开(公告)日：2025-02-06

申请号：US18602472

申请日：2024-03-12

Applicant: Hitachi, Ltd.

Inventor： Takashi NAGAO ,  Tomohiro YOSHIHARA ,  Jun MIYASHITA ,  Masahiro TSURUYA

IPC: G06F3/06

Abstract: A storage device includes a processor and an accelerator configured to compress and decompress data. The processor receives first replacement write data for a part of a first logical address region to update first data in the first logical address region that has been compressed by basic compression unit. The processor instructs the accelerator to compress the first replacement write data by a size smaller than the basic compression unit. The accelerator compresses the first replacement write data by the smaller size. The processor merges not-to-be-replaced data in the first logical address region and the first replacement data that are decompressed by the accelerator to generate uncompressed data having a size of the basic compression unit. The processor instructs the accelerator to compress the uncompressed data by the basic compression unit.