Patents by Inventor Shinsuke Izawa

Shinsuke Izawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11755249
    Abstract: To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.
    Type: Grant
    Filed: April 28, 2022
    Date of Patent: September 12, 2023
    Assignee: HITACHI, LTD.
    Inventors: Masahiro Tsuruya, Tomohiro Yoshihara, Ryosuke Tatsumi, Shinsuke Izawa
  • Publication number: 20220253250
    Abstract: To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.
    Type: Application
    Filed: April 28, 2022
    Publication date: August 11, 2022
    Inventors: Masahiro TSURUYA, Tomohiro YOSHIHARA, Ryosuke TATSUMI, Shinsuke IZAWA
  • Patent number: 11347432
    Abstract: To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: May 31, 2022
    Assignee: HITACHI, LTD.
    Inventors: Masahiro Tsuruya, Tomohiro Yoshihara, Ryosuke Tatsumi, Shinsuke Izawa
  • Patent number: 11137935
    Abstract: Provided is a storage system in which a plurality of storage controllers communicate with each other and an identifier of each storage controller is determined. The storage system includes a plurality of controllers that receive and process an input and output request specifying any of a plurality of volumes from an external device, and a plurality of switches each having a plurality of ports. The plurality of controllers are connected in parallel to the plurality of switches and communicate with each other via the plurality of switches. Each of the plurality of controllers acquires a plurality of port identifiers identifying a plurality of connected ports from the connected switches, and determines a controller identifier in the storage system based on the acquired plurality of port identifiers.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: October 5, 2021
    Assignee: HITACHI, LTD.
    Inventors: Shinsuke Izawa, Sadahiro Sugimoto
  • Publication number: 20200272359
    Abstract: To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.
    Type: Application
    Filed: August 27, 2019
    Publication date: August 27, 2020
    Inventors: Masahiro TSURUYA, Tomohiro YOSHIHARA, Ryosuke TATSUMI, Shinsuke IZAWA
  • Publication number: 20200210099
    Abstract: Provided is a storage system in which a plurality of storage controllers communicate with each other and an identifier of each storage controller is determined. The storage system includes a plurality of controllers that receive and process an input and output request specifying any of a plurality of volumes from an external device, and a plurality of switches each having a plurality of ports. The plurality of controllers are connected in parallel to the plurality of switches and communicate with each other via the plurality of switches. Each of the plurality of controllers acquires a plurality of port identifiers identifying a plurality of connected ports from the connected switches, and determines a controller identifier in the storage system based on the acquired plurality of port identifiers.
    Type: Application
    Filed: March 9, 2020
    Publication date: July 2, 2020
    Applicant: HITACHI, LTD.
    Inventors: Shinsuke IZAWA, Sadahiro SUGIMOTO
  • Patent number: 10606508
    Abstract: Provided is a storage system in which a plurality of storage controllers communicate with each other and an identifier of each storage controller is determined. The storage system includes a plurality of controllers that receive and process an input and output request specifying any of a plurality of volumes from an external device, and a plurality of switches each having a plurality of ports. The plurality of controllers are connected in parallel to the plurality of switches and communicate with each other via the plurality of switches. Each of the plurality of controllers acquires a plurality of port identifiers identifying a plurality of connected ports from the connected switches, and determines a controller identifier in the storage system based on the acquired plurality of port identifiers.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: March 31, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Shinsuke Izawa, Sadahiro Sugimoto
  • Patent number: 10095625
    Abstract: When one of a plurality of storage apparatuses receives an input/output (IO) request in which the address of a logical volume is designated, a cache destination storage device in which I/O data conforming to the received I/O request is to be cached is determined on the basis of a target I/O pattern and/or a coupling mode. The I/O data is cached in the CM area of the cache destination storage device. The target I/O pattern is the one among a plurality of I/O patterns to which an I/O conforming to the received I/O request belongs. Each of the plurality of I/O patterns pertains to whether an I/O destination address in the logical volume is random or sequential. The coupling mode indicates whether or not a storage device that receives an I/O request in which the same address as that designated in the received I/O request is designated has been determined.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: October 9, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Shinsuke Izawa, Sadahiro Sugimoto, Yuki Sakashita
  • Publication number: 20170357589
    Abstract: When one of a plurality of storage apparatuses receives an input/output (IO) request in which the address of a logical volume is designated, a cache destination storage device in which I/O data conforming to the received I/O request is to be cached is determined on the basis of a target I/O pattern and/or a coupling mode. The I/O data is cached in the CM area of the cache destination storage device. The target I/O pattern is the one among a plurality of I/O patterns to which an I/O conforming to the received I/O request belongs. Each of the plurality of I/O patterns pertains to whether an I/O destination address in the logical volume is random or sequential. The coupling mode indicates whether or not a storage device that receives an I/O request in which the same address as that designated in the received I/O request is designated has been determined.
    Type: Application
    Filed: June 19, 2015
    Publication date: December 14, 2017
    Inventors: Shinsuke IZAWA, Sadahiro SUGIMOTO, Yuki SAKASHITA
  • Publication number: 20130258827
    Abstract: An optical disk that enables a laser beam to be focused on an object track without making mistakes, an optical disk device, a format processing method, and a recording method. The optical disk shall be configured to has a guiding layer with a physical groove structure containing address information and a single or multiple recording layers with no groove structure, in which the guide areas for recording the address information thereon are formed along a track of the guide layer at fixed intervals in a user data area of each recording layer. An address for the recording layer is generated based on information obtained from the guide layer, and the address for the recording layer is recorded in the guide area.
    Type: Application
    Filed: March 4, 2013
    Publication date: October 3, 2013
    Applicant: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Shinsuke IZAWA, Masayuki HIRABAYASHI
  • Patent number: 8203919
    Abstract: The invention provides an optical disc apparatus which prevents that a laser beam whose power is set at a read power level causes erroneous data recording or deletion. The optical disc apparatus includes an emission controller which controls an amount of an electrical current that a current supply portion supplies to a laser diode in order to control a level of emission power at which the laser diode emits the laser beam. The emission controller has a function to set levels of the emission power at the following transition processings: a transition processing after a read processing and before a write processing, a transition processing after a write processing and before a read processing, a transition processing between two read processings for respective areas, and a transition processing between two write processings for respective areas.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: June 19, 2012
    Assignees: Hitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
    Inventors: Shinsuke Izawa, Manabu Shiozawa
  • Publication number: 20110211432
    Abstract: The invention provides an optical disc apparatus which prevents that a laser beam whose power is set at a read power level causes erroneous data recording or deletion. The optical disc apparatus includes an emission controller which controls an amount of an electrical current that a current supply portion supplies to a laser diode in order to control a level of emission power at which the laser diode emits the laser beam. The emission controller has a function to set levels of the emission power at the following transition processings: a transition processing after a read processing and before a write processing, a transition processing after a write processing and before a read processing, a transition processing between two read processings for respective areas, and a transition processing between two write processings for respective areas.
    Type: Application
    Filed: December 17, 2010
    Publication date: September 1, 2011
    Inventors: Shinsuke IZAWA, Manabu Shiozawa