Patents by Inventor Yoshiaki Kuwahara
Yoshiaki Kuwahara 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).
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Patent number: 7861034Abstract: A storage system stores multiple copies of data on physical storage implemented, for example, with multiple disk units. Input/output read requests are received from host systems and distributed in a manner that allows parallel read operations to be conducted over the multiple disk units of the physical storage.Type: GrantFiled: February 12, 2007Date of Patent: December 28, 2010Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Publication number: 20080041097Abstract: The present invention aims to provide a refrigerant distribution device which eliminates a need for maintaining a certain length of a straight portion at an inflow tube to a distributor, and for adjusting lengths of capillary tubes to send a refrigerant to each flow path of the refrigerant of a heat exchanger, and which resolves an unevenness of a liquid refrigerant at a bend of the inflow tube due to a centrifugal force. A refrigerant distribution device according to the present invention including an inflow tube, which is connected to a distributor for distributing and providing a refrigerant in a gas-liquid two-phase state to a heat exchanger, wherein an upstream side of the inflow tube is in an approximately horizontal position and a downstream side of the inflow tube is bent to stand approximately at a right angle, includes a bend of the inflow tube, a longitudinal form of which is made of a combination of straight lines and is bent approximately at a right angle.Type: ApplicationFiled: August 20, 2007Publication date: February 21, 2008Applicant: Mitsubishi Electric CorporationInventors: Ryo Oya, Kazunobu Sekiguchi, Masahiko Takagi, Ryoji Abe, Yoshiaki Kuwahara
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Publication number: 20070239958Abstract: A storage system stores multiple copies of data on physical storage implemented, for example, with multiple disk units. Input/output read requests are received from host systems and distributed in a manner that allows parallel read operations to be conducted over the multiple disk units of the physical storage.Type: ApplicationFiled: February 12, 2007Publication date: October 11, 2007Applicant: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 7254674Abstract: A method of respectively reading and writing data to and from a plurality of physical disk units in response to I/O requests from a host computing system includes establishing a logical disk group having a number of logical disk elements, mapping each of the logical disk elements to corresponding physical disk units, receiving from the host computing system an I/O request for data to select a one of the number of logical disk elements, accessing the physical disk unit corresponding to the selected one logical disk to access for the data, and transferring the accessed data to the host computing system.Type: GrantFiled: March 11, 2004Date of Patent: August 7, 2007Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 7082496Abstract: In an information processing system having a data processing apparatus, a control unit for a cache memory, and a storage unit for storing a record, respectively interconnected together, wherein when the control unit receives from the data processing apparatus a write request for a record to be written and if the record to be written is not being stored in the cache memory, the control unit receives a data to be written in the object record from the data processing apparatus and stores the received data in the cache memory. After notifying the data processing apparatus of a completion of a data write process, the control unit checks if the object record in which the data stored in the cache memory is being stored in the storage unit, if the object record is being stored in the storage unit, the data in the cache memory is written in the storage unit, and if not, the data in the cache memory is not written and such effect is notified to the data processing apparatus.Type: GrantFiled: August 4, 2003Date of Patent: July 25, 2006Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Shigeo Homma, Yoshihiro Asaka, Yoshiaki Kuwahara, Akira Kurano, Masafumi Nozawa, Hiroyuki Kitajima
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Publication number: 20050240728Abstract: The control unit arbitrarily with respect to the CPU, including according to an algorithm that is independent of the request a disk unit among the disk units that are inactive when the control unit receives an input/output request involving either read or staging. For a write request from the CPU, the control unit selects a specific disk unit in the disk unit group for the immediate writing of data. In the second kind of load distribution a disk unit is selected to execute read and staging other than the above-mentioned specific disk.Type: ApplicationFiled: June 27, 2005Publication date: October 27, 2005Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 6938125Abstract: A disk storage system has a control unit having a plurality of external ports connectable to a mirrored disk including two disks to which write data is written. When the control unit receives two read requests issued from a processor to the disk unit group, a first read operation is performed to read data requested by the first read request from one of the disks and a second read operation is performed to read data requested by the second read request from the other one of the disks. Also, a first transferring operation is performed to transfer data read by the first read operation to one external port of the control unit and a second transferring operation is performed to transfer data read by the second read operation to another external port of the control unit. Further, the data read by the two read operations is transferred to the processor via the external ports.Type: GrantFiled: August 6, 2003Date of Patent: August 30, 2005Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Publication number: 20040177220Abstract: A storage system stores multiple copies of data on physical storage implemented, for example, with multiple disk units. Input/output read requests are received from host systems and distributed in a manner that allows parallel read operations to be conducted over the multiple disk units of the physical storage.Type: ApplicationFiled: March 11, 2004Publication date: September 9, 2004Applicant: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 6728832Abstract: A method of respectively reading and writing data to and from a plurality of physical disk units in response to I/O requests from a host computing system includes establishing a logical disk group having a number of logical disk elements, mapping each of the logical disk elements to corresponding physical disk units, receiving from the host computing system an I/O request for data to select a one of the number of logical disk elements, accessing the physical disk unit corresponding to the selected one logical disk to access for the data, and transferring the accessed data to the host computing system.Type: GrantFiled: March 20, 2001Date of Patent: April 27, 2004Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Publication number: 20040030829Abstract: The control unit arbitrarily with respect to the CPU, including according to an algorithm that is independent of the request a disk unit among the disk units that are inactive when the control unit receives an input/output request involving either read or staging. For a write request from the CPU, the control unit selects a specific disk unit in the disk unit group for the immediate writing of data. In the second kind of load distribution a disk unit is selected to execute read and staging other than the above-mentioned specific disk.Type: ApplicationFiled: August 6, 2003Publication date: February 12, 2004Applicant: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Publication number: 20040030828Abstract: In an information processing system having a data processing apparatus, a control unit for a cache memory, and a storage unit for storing a record, respectively interconnected together, wherein when the control unit receives from the data processing apparatus a write request for a record to be written and if the record to be written is not being stored in the cache memory, the control unit receives a data to be written in the object record from the data processing apparatus and stores the received data in the cache memory. After notifying the data processing apparatus of a completion of a data write process, the control unit checks if the object record in which the data stored in the cache memory is being stored in the storage unit, if the object record is being stored in the storage unit, the data in the cache memory is written in the storage unit, and if not, the data in the cache memory is not written and such effect is notified to the data processing apparatus.Type: ApplicationFiled: August 4, 2003Publication date: February 12, 2004Applicant: Hitachi, Ltd.Inventors: Akira Yamamoto, Shigeo Homma, Yoshihiro Asaka, Yoshiaki Kuwahara, Akira Kurano, Masafumi Nozawa, Hiroyuki Kitajima
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Patent number: 6631443Abstract: A disk storage system has a control unit having a plurality of external ports connectable to a mirrored disk including two disks to which write data is written. When the control unit receives two read requests issued from a processor to the disk unit group, a first read operation is performed to read data requested by the first read request from one of the disks and a second read operation is performed to read data requested by the second read request from the other one of the disks. Also, a first transferring operation is performed to transfer data read by the first read operation to one external port of the control unit and a second transferring operation is performed to transfer data read by the second read operation to another external port of the control unit. Further, the data read by the two read operations is transferred to the processor via the external ports.Type: GrantFiled: July 18, 2000Date of Patent: October 7, 2003Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Publication number: 20010023463Abstract: A storage system stores multiple copies of data on physical storage implemented, for example, with multiple disk units. Input/output read requests are received from host systems and distributed in a manner that allows parallel read operations to be conducted over the multiple disk units of the physical storage.Type: ApplicationFiled: March 20, 2001Publication date: September 20, 2001Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 6250372Abstract: An air condition includes a suction grill for sucking the air in a room, a front panel including an inlet port for sucking the air from the suction grill inside and a blowout port for blowing the air out into the room, a heat exchanger for heat exchange of the air, and a blower for circulating the air, wherein a concave air passage for room temperature detection is formed on the front face of the front panel, and an air suction port for sucking air for room temperature detection is formed in suction grill at an opposite part to air passage.Type: GrantFiled: October 8, 1999Date of Patent: June 26, 2001Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuyuki Arai, Masaharu Miwa, Tetsuji Uchiyama, Yoshiaki Kuwahara, Kengo Takahashi
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Patent number: 6108750Abstract: A disk storage system has a control unit having a plurality of external connection points. When the control unit receives two read requests issued from a processor to two disks of a disk unit group, a first read operation is performed to read data requested by the first read request from one of the disks and a second read operation is performed to read data requested by the second read request from the other one of the disks. Also, a first output operation is performed to output data read by the first read operation from one of the external connection points of the control unit and a second output operation is performed to output data read by the second read operation from another of the external connection points of the control unit. The second output operation is started before the first output operation has finished.Type: GrantFiled: July 16, 1998Date of Patent: August 22, 2000Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 6085286Abstract: In an information processing system having a data processing apparatus, a control unit for a cache memory, and a storage unit for storing a record, respectively interconnected together, wherein when the control unit receives from the data processing apparatus a write request for a record to be written and if the record to be written is not being stored in the cache memory, the control unit receives a data to be written in the object record from the data processing apparatus and stores the received data in the cache memory. After notifying the data processing apparatus of a completion of a data write process, the control unit checks if the object record in which the data stored in the cache memory is being stored in the storage unit, if the object record is being stored in the storage unit, the data in the cache memory is written in the storage unit, and if not, the data in the cache memory is not written and such effect is notified to the data processing apparatus.Type: GrantFiled: December 21, 1998Date of Patent: July 4, 2000Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Shigeo Homma, Yoshihiro Asaka, Yoshiaki Kuwahara, Akira Kurano, Masafumi Nozawa, Hiroyuki Kitajima
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Patent number: 5987911Abstract: An air conditioner includes suction grill for sucking the air in a room, a front panel including an inlet port for sucking the air from the suction grill inside and a blowout port for blowing the air out into the room, a heat exchanger for working heat exchange of the air, and a blower for circulating the air, wherein a concave air passage for room temperature detection is formed on the front face of the front panel, and an air suction port for sucking air for room temperature detection is formed in suction grill at an opposite part to air passage.Type: GrantFiled: June 16, 1998Date of Patent: November 23, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yasuyuki Arai, Masaharu Miwa, Tetsuji Uchiyama, Yoshiaki Kuwahara, Kengo Takahashi
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Patent number: 5835938Abstract: For a write request from the CPU, the control unit selects a specific disk unit in the disk unit group for the immediate writing of data. In a second kind of load distribution a disk unit is selected to execute read and staging other than the above-mentioned specific disk.Type: GrantFiled: June 3, 1997Date of Patent: November 10, 1998Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima
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Patent number: 5694576Abstract: In an information processing system having a data processing apparatus, a control unit for a cache memory, and a storage unit for storing a record, respectively interconnected together, wherein when the control unit receives from the data processing apparatus a write request for a record to be written and if the record to be written is not being stored in the cache memory, the control unit receives a data to be written in the object record from the data processing apparatus and stores the received data in the cache memory. After notifying the data processing apparatus of a completion of a data write process, the control unit checks if the object record in which the data stored in the cache memory is being stored in the storage unit, if the object record is being stored in the storage unit, the data in the cache memory is written in the storage unit, and if not, the data in the cache memory is not written and such effect is notified to the data processing apparatus.Type: GrantFiled: September 19, 1995Date of Patent: December 2, 1997Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Shigeo Homma, Yoshihiro Asaka, Yoshiaki Kuwahara, Akira Kurano, Masafumi Nozawa, Hiroyuki Kitajima
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Patent number: 5680574Abstract: The control unit arbitrarily selects a disk unit among the disk units that are inactive when the control unit receives an input/output request involving either read or staging. For a write request, the control unit selects a master disk unit in the disk unit group for the immediate writing of data, and a disk unit other than the above-mentioned master disk is preferably selected to execute the read and staging unit. After writing is used to write the data into the other disk units after the write request execution is completed by writing to the master disk unit.Type: GrantFiled: December 12, 1994Date of Patent: October 21, 1997Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Takao Satoh, Shigeo Honma, Yoshihiro Asaka, Yoshiaki Kuwahara, Hiroyuki Kitajima