Patents by Inventor Tsunetaka Komachiya

Tsunetaka Komachiya 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).

  • Method and apparatus for implementing redundancy on data stored in a disk array subsystem based on use frequency or importance of the data
    Patent number: 6611897
    Abstract: In a disk array subsystem capable of changing the data redundancy method between a duplicating method and a parity method, the load of data transfer occurring at the time of changing the data redundant method is reduced. In the disk array subsystem, since one data of the duplicated data are used for data for the parity data area, the one data secures an area for storing parity prepared from the data. With the arrangement, it is not necessary to transfer the data when the data redundancy method is changed from the duplicating to the parity method and the data transfer load is mitigated.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: August 26, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Tsunetaka Komachiya, Yoshihisa Kamo, Akira Yamamoto
  • Method for changing raid-level in disk array subsystem
    Patent number: 6571314
    Abstract: In a disk array subsystem capable of changing the data redundancy method between a duplicating method and a parity method, the load of data transfer occurring at the time of changing the data redundant method is reduced. In the disk array subsystem, since one data of the duplicated data are used for data for the parity data area, the one data secures an area for storing parity prepared from the data. With the arrangement, it is not necessary to transfer the data when the data redundancy method is changed from the duplicating to the parity method and the data transfer load is mitigated.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: May 27, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Tsunetaka Komachiya, Yoshihisa Kamo, Akira Yamamoto
  • Method and apparatus for changing raid-level in disk array subsystem
    Publication number: 20020112118
    Abstract: In a disk array subsystem capable of changing the data redundancy method between a duplicating method and a parity method, the load of data transfer occurring at the time of changing the data redundant method is reduced. In the disk array subsystem, since one data of the duplicated data are used for data for the parity data area, the one data secures an area for storing parity prepared from the data. With the arrangement, it is not necessary to transfer the data when the data redundancy method is changed from the duplicating to the parity method and the data transfer load is mitigated.
    Type: Application
    Filed: April 17, 2002
    Publication date: August 15, 2002
    Inventors: Tsunetaka Komachiya, Yoshihisa Kamo, Akira Yamamoto