公开(公告)号：US20180307433A1

公开(公告)日：2018-10-25

申请号：US15769424

申请日：2016-02-29

Applicant: Hitachi, Ltd.

Inventor： Nobumitsu TAKAOKA ,  Akira YAMAMOTO ,  Tomohiro KAWAGUCHI ,  Yasuo WATANABE ,  Yoshihiro YOSHII ,  Kazuki MATSUGAMI

IPC: G06F3/06

CPC classification number: G06F3/0641 ,  G06F3/0608 ,  G06F3/0644 ,  G06F3/0653 ,  G06F3/0659 ,  G06F3/0673

Abstract: A storage system according to an aspect of the present invention includes one or more storage devices for storing write data to which a write request from a host computer is directed, and a storage controller that provides one or more volumes to the host computer. Further, the storage system manages the time when a write request is last received from the host computer for each partition within the volume. Then, the storage controller performs a deduplication process upon detecting the partition not receiving a write request for a predetermined time or more from the time when the write request is last received.

公开(公告)号：US20150363129A1

公开(公告)日：2015-12-17

申请号：US14762955

申请日：2013-11-07

Applicant: Hitachi, Ltd.

Inventor： Yasuo WATANABE ,  Norio SHIMOZONO

IPC: G06F3/06

CPC classification number: G06F3/0619 ,  G06F3/0608 ,  G06F3/0641 ,  G06F3/0665 ,  G06F3/0689

Abstract: A storage control apparatus performs, for each virtual area to which a physical area is allocated, any one of coarse-grained management for managing a correspondence relationship between a virtual area and a physical area in a first size unit, and fine-grained management for managing a correspondence relationship between a virtual area and a physical area in a second size unit smaller than the first size unit. The storage control apparatus manages mapping information that expresses a correspondence relationship between a virtual area and a physical area. The storage control apparatus performs at least one of change of any of fine-grained virtual areas to a coarse-grained virtual area and change of any of coarse-grained virtual areas to a fine-grained virtual area, based on the number of duplication areas of each virtual area and a size of the mapping information.

Abstract translation: 存储控制装置对于分配有物理区域的每个虚拟区域执行用于管理第一尺寸单元中的虚拟区域和物理区域之间的对应关系的粗粒度管理中的任一种，以及用于 在比第一尺寸单位小的第二尺寸单元中管理虚拟区域和物理区域之间的对应关系。 存储控制装置管理表示虚拟区域和物理区域之间的对应关系的映射信息。 存储控制装置将细粒度虚拟区域中的任意一个区域的任意一个改变为粗粒度虚拟区域，并且基于复制区域的数量将粗粒度虚拟区域中的任意一个区域改变为细粒度虚拟区域 的每个虚拟区域和映射信息的大小。

公开(公告)号：US20180349693A1

公开(公告)日：2018-12-06

申请号：US15918830

申请日：2018-03-12

Applicant: HITACHI, LTD.

Inventor： Yasuo WATANABE ,  Toshio OKOCHI ,  Hiroshi SHINJO ,  Masahiro MOTOBAYASHI ,  Yasufumi SUZUKI

IPC: G06K9/00

CPC classification number: G06K9/00469 ,  G06K9/00463 ,  G06K9/00483 ,  G06K9/6202 ,  G06K2209/01 ,  G06Q30/04

Abstract: A computer, which is configured to extract an attribute being a character string indicating a feature of a paper-based document, the computer stores template information dictionary information. The computer is configured to: execute character recognition processing on image data on the paper-based document; extract an attribute corresponding to each of the at least one type of attribute, which is defined in each of the plurality of templates, through use of a result of the character recognition processing and the plurality of templates; calculate a score regarding the extracted attribute for each of the plurality of templates; select one of the plurality of templates that has the highest extraction accuracy of the attribute based on the score; and generate output information through use of the selected template.

公开(公告)号：US20180074746A1

公开(公告)日：2018-03-15

申请号：US15553174

申请日：2015-03-16

Applicant: Hitachi, Ltd.

Inventor： Yasuo WATANABE ,  Hiroaki AKUTSU

IPC: G06F3/06 ,  G06F12/10

CPC classification number: G06F3/0641 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0665 ,  G06F3/067 ,  G06F12/10 ,  G06F2212/1044 ,  G06F2212/152 ,  G06F2212/154

Abstract: Regarding a distributed storage system including a plurality of nodes, a first node among the plurality of nodes judges whether the same data as first data, which is written to a first virtual partial area managed by the first node from among a plurality of virtual partial areas, exists in the virtual partial area managed by another node among the plurality of nodes; when the same data as the first data exists in the other node, the first node executes inter-node deduplication for changing allocation of either one of logical partial areas for the first virtual partial area or the virtual partial area of the other node to which the same data is written, to the other logical partial area; and when I/O load on the first node after execution of the inter-node deduplication of the first virtual partial area and the predicted value is less than a first threshold, the first node executes the inter-node deduplication of a second virtual partial area managed by the first node from among the plurality of virtual partial areas obtained by dividing the virtual storage area.

公开(公告)号：US20180039423A1

公开(公告)日：2018-02-08

申请号：US15552988

申请日：2015-05-12

Applicant: HITACHI, LTD.

Inventor： Yoshihiro YOSHII ,  Yasuo WATANABE ,  Yoshinori OHIRA

IPC: G06F3/06

CPC classification number: G06F3/0608 ,  G06F3/0641 ,  G06F3/065 ,  G06F3/068 ,  G06F3/0689 ,  G06F12/00

Abstract: This storage system is designed to: divide data into a plurality of chunk data (pieces of data) in a deduplication process; select one or more chunk data from among the plurality of chunk data in accordance with a sampling period which indicates that, on average, one chunk data be selected from among each N chunk data; and calculate a fingerprint, such as a hash value, for each of one or more characteristic chunk data, which are the selected one or more chunk data, and determine whether data including the one or more characteristic chunk data is a duplication. The storage system changes the sampling period on the basis of the results of past deduplication processes.

公开(公告)号：US20170024142A1

公开(公告)日：2017-01-26

申请号：US15124685

申请日：2014-08-29

Applicant: Hitachi, Ltd.

Inventor： Yasuo WATANABE ,  Norio SIMOZONO

IPC: G06F3/06

CPC classification number: G06F3/0608 ,  G06F3/0641 ,  G06F3/0689 ,  G06F12/0868 ,  G06F2212/214

Abstract: A storage subsystem according to one preferred embodiment of the present invention comprises multiple storage devices, and a controller for executing an I/O processing to the storage device by receiving an I/O request from a host computer. The controller has an index for managing a representative value of the respective data stored in the storage devices. When a write data is received from the host computer, a representative value of the write data is calculated, and the index is searched to check whether a representative value equal to the representative value of the write data is stored or not. When a representative value equal to the representative value of the write data is stored in the index, the write data and the data corresponding to the same representative value are stored in the same storage device.

Abstract translation: 根据本发明的一个优选实施例的存储子系统包括多个存储设备和用于通过从主计算机接收I / O请求来对存储设备执行I / O处理的控制器。 控制器具有用于管理存储在存储装置中的各个数据的代表值的索引。 当从主计算机接收到写入数据时，计算出写入数据的代表值，并且搜索索引以检查是否存储与写入数据的代表值相等的代表值。 当等于写入数据的代表值的代表值存储在索引中时，与相同代表值相对应的写入数据和数据被存储在相同的存储装置中。