公开(公告)号：US11914868B2

公开(公告)日：2024-02-27

申请号：US17902767

申请日：2022-09-02

申请人： Hitachi, Ltd.

发明人： Ryo Hanafusa ,  Tomohiro Yoshihara ,  Ryosuke Tatsumi ,  Hiroki Fujii

IPC分类号： G06F3/06

CPC分类号： G06F3/0619 ,  G06F3/0653 ,  G06F3/0659 ,  G06F3/0683

摘要： A storage system comprises nodes and drives, and includes at least one mounting area to install the drives. A node manages a parity group constituted of the plurality of drives; generates, in a case where a target drive that is installed in a first mounting area and that belongs to a first parity group is to be moved from the first mounting area to a second mounting area, difference information regarding a storage area where data was written into the target drive during a period in which the target drive is moved from the first mounting area to the second mounting area; and restore data written into the storage area by using data stored in other drives than the target drive that belongs to the first parity group based on the difference information, and write the data into the target drive that has been moved to the second mounting area.

公开(公告)号：US10394480B2

公开(公告)日：2019-08-27

申请号：US15769418

申请日：2016-01-22

申请人： HITACHI, LTD.

发明人： Masahiro Tsuruya ,  Ryo Hanafusa ,  Osamu Kawaguchi

IPC分类号： G06F3/06 ,  G06F12/04 ,  G06F12/10 ,  G06F12/02

摘要： It is possible to prevent unoccupied blocks from being depleted by a write of logical-physical management information. A processor is capable of performing an unoccupied user block generation process by moving user data stored in allocated user blocks in order to generate unoccupied user blocks serving as unoccupied blocks among allocated user blocks, and performing an unoccupied meta block generation process by moving meta data stored in allocated meta blocks in order to generate unoccupied meta blocks serving as unoccupied blocks among the allocated meta blocks. The processor calculates the number of unoccupied meta blocks to be consumed, that is, the number of unoccupied meta blocks to be consumed by the unoccupied user block generation process. The processor performs the unoccupied meta block generation process based on the number of unoccupied meta blocks to be consumed.