Patents by Inventor Takumi TAKAGI

Takumi TAKAGI 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: 9563377
    Abstract: In order to reduce the amount of consumption of a back-end bandwidth in a storage apparatus, a computer system includes: a first storage device; and a second storage device that is coupled to the first controller through a first interface and is coupled to the second controller through a second interface. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The second controller reads the second data from the second storage device in response to a Read request received from the host computer through a second communication channel; and transmit the second data to the host computer through the second communication channel.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: February 7, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Takumi Takagi, Takashi Chikusa
  • Publication number: 20150286439
    Abstract: In order to reduce the amount of consumption of a back-end bandwidth in a storage apparatus, a computer system includes: a first storage device; and a second storage device that is coupled to the first controller through a first interface and is coupled to the second controller through a second interface. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The second controller reads the second data from the second storage device in response to a Read request received from the host computer through a second communication channel; and transmit the second data to the host computer through the second communication channel.
    Type: Application
    Filed: May 21, 2015
    Publication date: October 8, 2015
    Applicant: Hitachi, Ltd.
    Inventors: Takumi TAKAGI, Takashi CHIKUSA
  • Patent number: 9055044
    Abstract: In order to reduce the amount of consumption of a back-end bandwidth in a storage apparatus, a computer system includes: a first storage device; and a second storage device that is coupled to the first controller through a first interface and is coupled to the second controller through a second interface. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The second controller reads the second data from the second storage device in response to a Read request received from the host computer through a second communication channel; and transmit the second data to the host computer through the second communication channel.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: June 9, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Takumi Takagi, Takashi Chikusa
  • Publication number: 20140173017
    Abstract: In order to reduce the amount of consumption of a back-end bandwidth in a storage apparatus, a computer system includes: a first storage device; and a second storage device that is coupled to the first controller through a first interface and is coupled to the second controller through a second interface. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The second controller reads the second data from the second storage device in response to a Read request received from the host computer through a second communication channel; and transmit the second data to the host computer through the second communication channel.
    Type: Application
    Filed: December 3, 2012
    Publication date: June 19, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Takumi Takagi, Takashi Chikusa
  • Patent number: 8638593
    Abstract: A semiconductor device having an SRAM macro which has a power-off function and facilitates a design associated with a change in storage capacity is provided. The semiconductor device has plural layout units each including a memory array having plural memory cells in an SRAM, a first peripheral circuit that writes data into the memory array and reads the data from the memory array, and a switch group that disconnects the memory array and the first peripheral circuit, and power wires.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: January 28, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Takumi Takagi, Daisuke Sasaki, Masahiko Nishiyama, Masatoshi Hasegawa
  • Publication number: 20120218812
    Abstract: A semiconductor device having an SRAM macro which has a power-off function and facilitates a design associated with a change in storage capacity is provided. The semiconductor device has plural layout units each including a memory array having plural memory cells in an SRAM, a first peripheral circuit that writes data into the memory array and reads the data from the memory array, and a switch group that disconnects the memory array and the first peripheral circuit, and power wires.
    Type: Application
    Filed: January 12, 2012
    Publication date: August 30, 2012
    Inventors: Takumi TAKAGI, Daisuke Sasaki, Masahiko Nishiyama, Masatoshi Hasegawa