Patents by Inventor Kensuke Narita
Kensuke Narita 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: 10521122Abstract: A storage apparatus and method of controlling same which, while preventing depletion of a storage area due to the generation of garbage, also prevent a drop in response performance from the perspective of the host, are proposed.Type: GrantFiled: September 6, 2018Date of Patent: December 31, 2019Assignee: HITACHI, LTD.Inventors: Takahiro Abe, Ran Ogata, Atsushi Sutoh, Kensuke Narita
-
Publication number: 20190235755Abstract: A storage apparatus and method of controlling same which, while preventing depletion of a storage area due to the generation of garbage, also prevent a drop in response performance from the perspective of the host, are proposed.Type: ApplicationFiled: September 6, 2018Publication date: August 1, 2019Applicant: HITACHI, LTD.Inventors: Takahiro ABE, Ran OGATA, Atsushi SUTOH, Kensuke NARITA
-
Patent number: 10152270Abstract: A storage system forms a high availability pair for data duplication using a first volume of a first storage apparatus as a primary volume and a second volume of a second storage apparatus as a secondary volume. The first volume and a third volume of a third storage apparatus are used as a primary volume and a secondary volume, respectively, to form an asynchronous copy pair. The second volume and the third volume are used as a primary volume and a secondary volume, respectively, to form a standby pair. When a command to form the asynchronous copy pair is received, the storage system refuses to form the asynchronous copy pair when the standby pair is not formed yet.Type: GrantFiled: November 28, 2014Date of Patent: December 11, 2018Assignee: Hitachi, Ltd.Inventors: Takamasa Sato, Takashi Sakaguchi, Azusa Jin, Kensuke Narita, Yosuke Katoh, Takashi Nagao
-
Patent number: 9983962Abstract: Fault-tolerance is improved by duplicating data and update information of that data. A storage system has a first storage apparatus that is connected to a host computer, and includes a plurality of first data volumes and a first journal volume, a second storage apparatus that is connected to the host computer and the first storage apparatus, and includes a plurality of second data volumes for storing duplicated data of each of the plurality of first data volumes, and a second journal volume for storing the duplicated data of the first journal volume, a third storage apparatus that is connected to the first storage apparatus, and includes a plurality of third data volumes that configure a remote copy pair with the plurality of first data volumes by using the journal data received from the first storage apparatus, and a fourth storage apparatus that is connected to the third storage apparatus.Type: GrantFiled: May 8, 2013Date of Patent: May 29, 2018Assignee: Hitachi, Ltd.Inventors: Kensuke Narita, Toru Suzuki, Naoko Ikegaya, Azusa Jin, Hideo Saito
-
Publication number: 20170300233Abstract: A storage system forms a high availability pair for data duplication using a first volume of a first storage apparatus as a primary volume and a second volume of a second storage apparatus as a secondary volume. The first volume and a third volume of a third storage apparatus are used as a primary volume and a secondary volume, respectively, to form an asynchronous copy pair. The second volume and the third volume are used as a primary volume and a secondary volume, respectively, to form a standby pair. When a command to form the asynchronous copy pair is received, the storage system refuses to form the asynchronous copy pair when the standby pair is not formed yet.Type: ApplicationFiled: October 28, 2014Publication date: October 19, 2017Inventors: Takamasa SATO, Takashi SAKAGUCHI, Azusa JIN, Kensuke NARITA, Yosuke KATOH, Takashi NAGAO
-
Patent number: 9239845Abstract: A backup copy from a first data volume to a second data volume is executed according to either a synchronous mode, in which write data is copied from the first data volume to the second data volume in synchronous with a write request, or an asynchronous mode, in which journal data of a first storage apparatus is reflected on the second data volume in asynchronous with the write request. A second storage apparatus acquires secondary load information representing its own load status, and transmits the information to the first storage apparatus. The first storage apparatus acquires primary load information representing its own load status, determines switching between the modes based on the secondary load information, the primary load information and mode information, and transmits determination information representing determination results to the second storage apparatus.Type: GrantFiled: December 24, 2013Date of Patent: January 19, 2016Assignee: HITACHI, LTD.Inventors: Takashi Sakaguchi, Takamasa Sato, Kensuke Narita, Yosuke Katoh
-
Publication number: 20160004616Abstract: Fault-tolerance is improved by duplicating data and update information of that data. A storage system has a first storage apparatus that is connected to a host computer, and includes a plurality of first data volumes and a first journal volume, a second storage apparatus that is connected to the host computer and the first storage apparatus, and includes a plurality of second data volumes for storing duplicated data of each of the plurality of first data volumes, and a second journal volume for storing the duplicated data of the first journal volume, a third storage apparatus that is connected to the first storage apparatus, and includes a plurality of third data volumes that configure a remote copy pair with the plurality of first data volumes by using the journal data received from the first storage apparatus, and a fourth storage apparatus that is connected to the third storage apparatus.Type: ApplicationFiled: May 8, 2013Publication date: January 7, 2016Inventors: Kensuke NARITA, Toru SUZUKI, Naoko IKEGAYA, Azusa JIN, Hideo SAITO
-
Publication number: 20150234860Abstract: A backup copy from a first data volume to a second data volume is executed according to either a synchronous mode, in which write data is copied from the first data volume to the second data volume in synchronous with a write request, or an asynchronous mode, in which journal data of a first storage apparatus is reflected on the second data volume in asynchronous with the write request. A second storage apparatus acquires secondary load information representing its own load status, and transmits the information to the first storage apparatus. The first storage apparatus acquires primary load information representing its own load status, determines switching between the modes based on the secondary load information, the primary load information and mode information, and transmits determination information representing determination results to the second storage apparatus.Type: ApplicationFiled: December 24, 2013Publication date: August 20, 2015Applicant: HITACHI, LTD.Inventors: Takashi Sakaguchi, Takamasa Sato, Kensuke Narita, Yosuke Katoh