Patents by Inventor Keiichi Matsuzawa

Keiichi Matsuzawa 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: 10977124
    Abstract: A distributed storage system includes a plurality of storage nodes including: a storage device for storing data in such a way that the data can be written thereto and read therefrom; a memory in which a software program is recorded; and a CPU for executing the software program. The memory stores group management information in which a group configured with a plurality of storage nodes and the storage nodes that configure the group are associated with each other and recorded. The CPU converts data into a plurality of data blocks so that the data is redundant at a predetermined data protection level, and stores the data blocks into each of a plurality of storage nodes belonging to the same group based on the group management information.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: April 13, 2021
    Assignee: HITACHI, LTD.
    Inventors: Mitsuo Hayasaka, Keiichi Matsuzawa
  • Patent number: 10936243
    Abstract: When a second storage device in a second site receives an update notification regarding a first element updated according to a write request from a first host, from a first storage device in a first site, for a second element specified on the basis of the update notification, the second storage device manages data of the first element corresponding to the second element as latest data. The first storage device provides a first volume capable of including a plurality of first elements. The second storage device provides a second volume capable of including a plurality of second elements corresponding to the plurality of first elements. When the second storage device receives a read request from a second host, the second storage device determines whether or not data of the first element corresponding to a read source second element (second element specified from the read request) is the latest data.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: March 2, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Akiyoshi Tsuchiya, Keiichi Matsuzawa, Mitsuo Hayasaka, Akira Yamamoto
  • Patent number: 10798149
    Abstract: When a part already transmitted to an object storage is updated by a file system management section while a plurality of parts are being transmitted to the object storage, a file transfer section requests the object storage to generate a temporary object that is a temporarily generated object containing the transmitted and updated part by combining the parts transmitted before update, re-splits a file into a plurality of parts so that the transmitted and updated data and not-transmitted data are handled as parts different from transmitted and not-updated data, and transmits the part containing the transmitted and updated data or the part containing the not-transmitted data to the object storage.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: October 6, 2020
    Assignee: HITACHI, LTD.
    Inventors: Masayuki Kobayashi, Keiichi Matsuzawa, Hitoshi Arai
  • Patent number: 10649691
    Abstract: An example of storage system obtains a reference request of a reference request data block that is included in the content and is stored in the medium area. The storage system determines a number of gaps among addresses, in the medium area, of a plurality of data blocks continuous in the content including the reference request data block. The storage system determines, based on the number of gaps, whether or not defrag based on the plurality of data blocks is valid. The storage system writes, when the defrag is determined to be valid, the plurality of data blocks read from the medium area to the memory area, into continuous address areas of the medium area.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: May 12, 2020
    Assignee: HITACHI, LTD.
    Inventors: Mitsuo Hayasaka, Ken Nomura, Keiichi Matsuzawa, Hitoshi Kamei
  • Patent number: 10606499
    Abstract: It is provided a computer system comprising at least one storage apparatus and a computer, wherein the each of the at least one storage apparatus is configured to manage identification information indicating specifics of the stored data, and wherein the computer determines whether the data to be written to the one of the at least one storage apparatus has duplicate data, which is the same data already stored in any one of the at least one storage apparatus, transmits deduplicated data, and uses at least one of individual pieces of identification information or a range of pieces of identification information, depending on how many pieces of identification information appear in succession, to request the information indicating whether the data that is associated with the calculated identification information is stored from the one of the at least one storage apparatus.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: March 31, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuo Hayasaka, Keiichi Matsuzawa
  • Publication number: 20200073584
    Abstract: When a second storage device in a second site receives an update notification regarding a first element updated according to a write request from a first host, from a first storage device in a first site, for a second element specified on the basis of the update notification, the second storage device manages data of the first element corresponding to the second element as latest data. The first storage device provides a first volume capable of including a plurality of first elements. The second storage device provides a second volume capable of including a plurality of second elements corresponding to the plurality of first elements. When the second storage device receives a read request from a second host, the second storage device determines whether or not data of the first element corresponding to a read source second element (second element specified from the read request) is the latest data.
    Type: Application
    Filed: August 3, 2017
    Publication date: March 5, 2020
    Inventors: Akiyoshi TSUCHIYA, Keiichi MATSUZAWA, Mitsuo HAYASAKA, Akira YAMAMOTO
  • Publication number: 20190215358
    Abstract: When a part already transmitted to an object storage is updated by a file system management section while a plurality of parts are being transmitted to the object storage, a file transfer section requests the object storage to generate a temporary object that is a temporarily generated object containing the transmitted and updated part by combining the parts transmitted before update, re-splits a file into a plurality of parts so that the transmitted and updated data and not-transmitted data are handled as parts different from transmitted and not-updated data, and transmits the part containing the transmitted and updated data or the part containing the not-transmitted data to the object storage.
    Type: Application
    Filed: February 24, 2017
    Publication date: July 11, 2019
    Inventors: Masayuki KOBAYASHI, Keiichi MATSUZAWA, Hitoshi ARAI
  • Patent number: 10235282
    Abstract: An allocation request for requesting allocation of a target virtual area with respect to target data issued to a system program includes a target ID corresponding to the target data. In response to the allocation request, whether or not the target ID is included in data map information is determined. When it is included in the data map information, the system program determines whether or not a target physical area is included in a storage apparatus. When the target physical area is included in the storage apparatus, the system program reserves a free area in a non-volatile memory as a target memory area, copies target data stored in the storage apparatus to the target memory area, changes the target physical area in the data map information to the target memory area, and writes an association between the target virtual area and the target memory area into the volatile memory.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: March 19, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Matsuzawa, Hitoshi Kamei
  • Patent number: 10210035
    Abstract: A computer system, having: a physical computer, which includes a processor and a memory; and an external apparatus, which is coupled to the physical computer and which includes a storage apparatus, the physical computer further includes: a virtualization module for providing at least one virtual machine; a first failure monitoring module for detecting a failure in the physical computer and the virtualization module; a first memory dump module for copying, to the external apparatus, a first area in the memory which is allocated to the virtualization module; a second failure monitoring module for detecting a failure in the virtual machine; and a second memory dump module for copying, to the external apparatus, a second area in the memory which is allocated by the virtualization module to the virtual machine.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: February 19, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Matsuzawa, Noboru Morishita, Toshiomi Moriki
  • Publication number: 20180267856
    Abstract: A distributed storage system includes a plurality of storage nodes including: a storage device for storing data in such a way that the data can be written thereto and read therefrom; a memory in which a software program is recorded; and a CPU for executing the software program. The memory stores group management information in which a group configured with a plurality of storage nodes and the storage nodes that configure the group are associated with each other and recorded. The CPU converts data into a plurality of data blocks so that the data is redundant at a predetermined data protection level, and stores the data blocks into each of a plurality of storage nodes belonging to the same group based on the group management information.
    Type: Application
    Filed: January 7, 2016
    Publication date: September 20, 2018
    Applicant: HITACHI, LTD.
    Inventors: Mitsuo HAYASAKA, Keiichi MATSUZAWA
  • Publication number: 20180253251
    Abstract: It is provided a computer system comprising at least one storage apparatus and a computer, wherein the each of the at least one storage apparatus is configured to manage identification information indicating specifics of the stored data, and wherein the computer determines whether the data to be written to the one of the at least one storage apparatus has duplicate data, which is the same data already stored in any one of the at least one storage apparatus, transmits deduplicated data, and uses at least one of individual pieces of identification information or a range of pieces of identification information, depending on how many pieces of identification information appear in succession, to request the information indicating whether the data that is associated with the calculated identification information is stored from the one of the at least one storage apparatus.
    Type: Application
    Filed: September 11, 2015
    Publication date: September 6, 2018
    Applicant: HITACHI, LTD.
    Inventors: Mitsuo HAYASAKA, Keiichi MATSUZAWA
  • Publication number: 20170351601
    Abstract: An allocation request for requesting allocation of a target virtual area with respect to target data issued to a system program includes a target ID corresponding to the target data. In response to the allocation request, whether or not the target ID is included in data map information is determined. When it is included in the data map information, the system program determines whether or not a target physical area is included in a storage apparatus. When the target physical area is included in the storage apparatus, the system program reserves a free area in a non-volatile memory as a target memory area, copies target data stored in the storage apparatus to the target memory area, changes the target physical area in the data map information to the target memory area, and writes an association between the target virtual area and the target memory area into the volatile memory.
    Type: Application
    Filed: June 1, 2015
    Publication date: December 7, 2017
    Inventors: Keiichi MATSUZAWA, Hitoshi KAMEI
  • Publication number: 20170277587
    Abstract: A computer system, having: a physical computer, which includes a processor and a memory; and an external apparatus, which is coupled to the physical computer and which includes a storage apparatus, the physical computer further includes: a virtualization module for providing at least one virtual machine; a first failure monitoring module for detecting a failure in the physical computer and the virtualization module; a first memory dump module for copying, to the external apparatus, a first area in the memory which is allocated to the virtualization module; a second failure monitoring module for detecting a failure in the virtual machine; and a second memory dump module for copying, to the external apparatus, a second area in the memory which is allocated by the virtualization module to the virtual machine.
    Type: Application
    Filed: October 8, 2014
    Publication date: September 28, 2017
    Inventors: Keiichi MATSUZAWA, Noboru MORISHITA, Toshiomi MORIKI
  • Patent number: 9766824
    Abstract: When computers and virtual machines operating in the computers both attempt to allocate a cache regarding the data in a secondary storage device to respective primary storage devices, identical data is prevented from being stored independently in multiple computers or virtual machines. An integrated cache management function in the computer arbitrates which computer or virtual machine should cache the data of the secondary storage device, and when the computer or the virtual machine executes input/output of data of the secondary storage device, the computer inquires the integrated cache management function, based on which the integrated cache management function retains the cache only in a single computer, and instructs the other computers to delete the cache. Thus, it is possible to prevent identical data from being cached in a duplicated manner in multiple locations of the primary storage device, and enables efficient capacity usage of the primary storage device.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: September 19, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Matsuzawa, Hitoshi Kamei
  • Publication number: 20160371035
    Abstract: An example of storage system obtains a reference request of a reference request data block that is included in the content and is stored in the medium area. The storage system determines a number of gaps among addresses, in the medium area, of a plurality of data blocks continuous in the content including the reference request data block. The storage system determines, based on the number of gaps, whether or not defrag based on the plurality of data blocks is valid. The storage system writes, when the defrag is determined to be valid, the plurality of data blocks read from the medium area to the memory area, into continuous address areas of the medium area.
    Type: Application
    Filed: March 27, 2014
    Publication date: December 22, 2016
    Applicant: HITACHI, LTD.
    Inventors: Mitsuo HAYASAKA, Ken NOMURA, Keiichi MATSUZAWA, Hitoshi KAMEI
  • Patent number: 9460106
    Abstract: A method switches file server from old file server to new file server which are coupled via a backend network and provides data synchronization. The old file server and new file server are coupled with one or more host computers via a frontend network to direct input/output (I/O) requests from the one or more host computers. The method comprises creating stub files in the new file server, the stub files including stub information indicating location of data in the old file server; switching I/O requests directed to old file server to I/O requests directed to the new file server; checking whether the new file server has any stub files; and, if the new file server has one or more stub files, recalling data corresponding to the one or more stub files from the old file server according to the stub information to replace the one or more stub files.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: October 4, 2016
    Assignee: Hitachi, Ltd.
    Inventor: Keiichi Matsuzawa
  • Publication number: 20160011809
    Abstract: When computers and virtual machines operating in the computers both attempt to allocate a cache regarding the data in a secondary storage device to respective primary storage devices, identical data is prevented from being stored independently in multiple computers or virtual machines. An integrated cache management function in the computer arbitrates which computer or virtual machine should cache the data of the secondary storage device, and when the computer or the virtual machine executes input/output of data of the secondary storage device, the computer inquires the integrated cache management function, based on which the integrated cache management function retains the cache only in a single computer, and instructs the other computers to delete the cache. Thus, it is possible to prevent identical data from being cached in a duplicated manner in multiple locations of the primary storage device, and enables efficient capacity usage of the primary storage device.
    Type: Application
    Filed: November 26, 2013
    Publication date: January 14, 2016
    Inventors: Keiichi MATSUZAWA, Hitoshi KAMEI
  • Patent number: 9229860
    Abstract: In the present invention, when configuration data art a LFS (Log-Structured File system) is stored on a virtual volume constructed from a plurality of Storage mediums, a temporal change of the file size on the file system is roughly estimated. Then, in accordance with the change, a capacity that is needed on the virtual volume is provided, a cursor at the end of a log is set, and a write cursor for writing data is set so as to avoid the position behind the cursor at the end of the log. Accordingly, it is possible to, when the LFS occupies only a small area on the virtual volume, avoid early execution of the allocation of an available capacity, and thus avoid a circumstance in which a large number of storage mediums are needed at an early stage of the operation of the virtual volume (see FIG. 1).
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: January 5, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Matsuzawa, Hitoshi Kamei, Mitsuo Hayasaka
  • Publication number: 20150331793
    Abstract: In the present invention, when configuration data on a LFS (Log-Structured File system) is stored on a virtual volume constructed from a plurality of storage mediums, a temporal change of the file size on the file system is roughly estimated. Then, in accordance with the change, a capacity that is needed on the virtual volume is provided, a cursor at the end of a log is set, and a write cursor for writing data is set so as to avoid the position behind the cursor at the end of the log. Accordingly, it is possible to, when the LFS occupies only a small area on the virtual volume, avoid early execution of the allocation of an available capacity, and thus avoid a circumstance in which a large number of storage mediums are needed at art early stage of the operation of the virtual volume (see FIG. 1).
    Type: Application
    Filed: March 26, 2014
    Publication date: November 19, 2015
    Applicant: Hitachi, Ltd.
    Inventor: KEIICHI MATSUZAWA
  • Patent number: 9146694
    Abstract: When processing data via multiple computers, the number of computers can be increased or decreased without actually moving the data assigned to the respective computers, and the data can be arranged and processed so as to enhance the performance of the system in response to the increase of the number of computers. A plurality of computers for performing data processing stores target data to be processed in a shared storage system, and when data processing is to performed, the shared storage divides the storage area storing data corresponding to the number of computers, and creates virtual data storage areas referring to a portion of the storage area for each computer, so as to enable each computer to refer to independent virtual data storage areas and to complete data processing.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: September 29, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Matsuzawa, Akira Yamamoto