Patents by Inventor Takashi Asako

Takashi Asako 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).

  • System and method for data multiplexing
    Patent number: 7672224
    Abstract: To reduce the load on a host for controlling a data doubling. Between a host and two disk subsystems, there is connected a data doubling device. This data doubling device behaves as if it were a unit disk subsystem for the host. The data doubling device doubles a data I/O instruction from the host and issues the doubled data I/O instruction to two disk subsystems. In case either of the disk subsystems becomes faulty, the data doubling device sends the data I/O instruction from the host only to the normal disk subsystem. After the fault recovery, the data doubling device performs a data copy between the disk subsystems.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: March 2, 2010
    Assignee: Hitachi, Ltd.
    Inventor: Takashi Asako
  • System and method for data multiplexing
    Publication number: 20060203857
    Abstract: To reduce the load on a host for controlling a data doubling. Between a host and two disk subsystems, there is connected a data doubling device. This data doubling device behaves as if it were a unit disk subsystem for the host. The data doubling device doubles a data I/O instruction from the host and issues the doubled data I/O instruction to two disk subsystems. In case either of the disk subsystems becomes faulty, the data doubling device sends the data I/O instruction from the host only to the normal disk subsystem. After the fault recovery, the data doubling device performs a data copy between the disk subsystems.
    Type: Application
    Filed: May 15, 2006
    Publication date: September 14, 2006
    Inventor: Takashi Asako
  • System and method for data multiplexing
    Patent number: 7069467
    Abstract: To reduce the load on a host for controlling a data doubling. Between a host and two disk subsystems, there is connected a data doubling device. This data doubling device behaves as if it were a unit disk subsystem for the host. The data doubling device doubles a data I/O instruction from the host and issues the doubled data I/O instruction to two disk subsystems. In case either of the disk subsystems becomes faulty, the data doubling device sends the data I/O instruction from the host only to the normal disk subsystem. After the fault recovery, the data doubling device performs a data copy between the disk subsystems.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: June 27, 2006
    Assignee: Hitachi, Ltd.
    Inventor: Takashi Asako
  • System and method for data multiplexing
    Publication number: 20050147132
    Abstract: To reduce the load on a host for controlling a data doubling. Between a host and two disk subsystems, there is connected a data doubling device. This data doubling device behaves as if it were a unit disk subsystem for the host. The data doubling device doubles a data I/O instruction from the host and issues the doubled data I/O instruction to two disk subsystems. In case either of the disk subsystems becomes faulty, the data doubling device sends the data I/O instruction from the host only to the normal disk subsystem. After the fault recovery, the data doubling device performs a data copy between the disk subsystems.
    Type: Application
    Filed: February 26, 2004
    Publication date: July 7, 2005
    Inventor: Takashi Asako