Patents by Inventor Masafumi Nozawa
Masafumi Nozawa 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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Publication number: 20050119994Abstract: A storage device is provided with a file I/O interface control device and a plurality of disk pools. The file I/O interface control device sets one of a plurality of storage hierarchies defining storage classes, respectively, for each of LUs within the disk pools, thereby forming a file system in each of the LUs. The file I/O interface control device migrates at least one of the files from one of the LUs to another one of the LUs of an optimal storage class, based on static properties and dynamic properties of each file.Type: ApplicationFiled: January 6, 2005Publication date: June 2, 2005Inventors: Naoto Matsunami, Koji Sonoda, Akira Yamamoto, Masafumi Nozawa, Masaaki Iwasaki
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Publication number: 20050022049Abstract: A disk subsystem assures the sequence and the coherence of data updating with two or more disk subsystems is provided with an asynchronous remote copy function. A main center 9 includes a computer system having the configuration of slave subsystems 3-2 to 3-n connected with a master disk subsystem 3-1. It secures the coherence between data at the main center 9 and the remote center 10 at the temporary suspension by repeating temporary suspension and release of the temporary suspension of the remote copy by the master subsystem 3-1 at predetermined opportunities. It also repeats temporary suspension and release of the temporary suspension of the remote copy by slave subsystems 3-2 to 3-n connected to it.Type: ApplicationFiled: July 16, 2004Publication date: January 27, 2005Applicant: Hitachi, Ltd.Inventors: Hideo Tabuchi, Akinobu Shimada, Masafumi Nozawa, Toshio Nakano
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Patent number: 6813683Abstract: A disk subsystem assures the sequence and the coherence of data updating with two or more disk subsystems is provided with an asynchronous remote copy function. A main center 9 includes a computer system having the configuration of slave subsystems 3-2 to 3-n connected with a master disk subsystem 3-1. It secures the coherence between data at the main center 9 and the remote center 10 at the temporary suspension by repeating temporary suspension and release of the temporary suspension of the remote copy by the master subsystem 3-1 at predetermined opportunities. It also repeats temporary suspension and release of the temporary suspension of the remote copy by slave subsystems 3-2 to 3-n connected to it.Type: GrantFiled: April 25, 2003Date of Patent: November 2, 2004Assignee: Hitachi, Ltd.Inventors: Hideo Tabuchi, Akinobu Shimada, Masafumi Nozawa, Toshio Nakano
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Publication number: 20040193760Abstract: A storage device is provided with a file I/O interface control device and a plurality of disk pools. The file I/O interface control device sets one of a plurality of storage hierarchies defining storage classes, respectively, for each of LUs within the disk pools, thereby forming a file system in each of the LUs. The file I/O interface control device migrates at least one of the files from one of the LUs to another one of the LUs of an optimal storage class, based on static properties and dynamic properties of each file.Type: ApplicationFiled: February 10, 2004Publication date: September 30, 2004Applicant: HITACHI, LTD.Inventors: Naoto Matsunami, Koji Sonoda, Akira Yamamoto, Masafumi Nozawa, Masaaki Iwasaki
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Publication number: 20040153719Abstract: An information processing system includes three storage apparatuses installed on three sites for the purpose of disaster recovery. The three storage apparatuses can be accessed by three information processing apparatuses, respectively, that are configured in a cluster. One of the storage apparatuses is set as a replication source and the other two storage apparatuses are set as replication destinations. The two storage apparatuses that are set as replication destinations manage a copy of data stored in the storage apparatus that is set as the replication source. In association with an execution of a failover on the information processing apparatus side, settings of the storage apparatuses as the replication source and replication destinations are automatically changed such that the storage apparatus that is set as the replication source would function as a replication destination, and one of the storage apparatuses that are set as the replication destinations would function as a replication source.Type: ApplicationFiled: August 7, 2003Publication date: August 5, 2004Applicant: HITACHI, LTDInventors: Kyosuke Achiwa, Masafumi Nozawa
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Publication number: 20040103164Abstract: An asynchronous remote copy system which can ensure the data renewal order and data integrity of the disk subsystems. The system provides for data mirroring by a main center having a gateway and a remote center having a gateway, and storage systems in each center connected to the corresponding gateway. Data is mirrored through synchronous type remote copy between volumes of the storage systems of each center. The gateway of the main center sends the renewal data to the gateway of the remote center in accordance with the order of renewal of volumes, to make the gateway of the remote center reflect the renewal data upon the volumes thereof through asynchronous type remote copy.Type: ApplicationFiled: October 20, 2003Publication date: May 27, 2004Inventors: Hideo Tabuchi, Masafumi Nozawa, Akinobu Shimada
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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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Publication number: 20030196053Abstract: A disk subsystem assures the sequence and the coherence of data updating with two or more disk subsystems is provided with an asynchronous remote copy function. A main center 9 includes a computer system having the configuration of slave subsystems 3-2 to 3-n connected with a master disk subsystem 3-1. It secures the coherence between data at the main center 9 and the remote center 10 at the temporary suspension by repeating temporary suspension and release of the temporary suspension of the remote copy by the master subsystem 3-1 at predetermined opportunities. It also repeats temporary suspension and release of the temporary suspension of the remote copy by slave subsystems 3-2 to 3-n connected to it.Type: ApplicationFiled: April 25, 2003Publication date: October 16, 2003Applicant: Hitachi, Ltd.Inventors: Hideo Tabuchi, Akinobu Shimada, Masafumi Nozawa, Toshio Nakano
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Publication number: 20030037247Abstract: A computing system and encryption/decryption method realizes assurance of security and improvement of throughput in a remote system. For this purpose, encrypted data is written to a storage system, it is determined whether data in the storage system is ciphertext or plaintext, and encrypted data is read, decrypted and re-written in storage asynchronously with writing encrypted data to storage.Type: ApplicationFiled: March 19, 2001Publication date: February 20, 2003Inventors: Kiyohiro Obara, Hisashi Takamatsu, Masafumi Nozawa, Takashi Oeda, Noboru Morishita
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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: 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: 5613088Abstract: A disk array apparatus, which has redundant data arranged in a distributing layout by record includes apparatus for speeding up redundant data updating processing during later updating, apparatus and a read head and write head securely mounted on a single actuator. In operation, old parity data is read out by the read head and then is used to generate new, updated parity data. The updated parity data is written into the record where the old parity data was held within one turn of the disk after the old parity data has been read out.Type: GrantFiled: July 26, 1994Date of Patent: March 18, 1997Assignee: Hitachi, Ltd.Inventors: Kyosuke Achiwa, Akira Yamamoto, Tetsuhiko Fujii, Takao Satoh, Masafumi Nozawa
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Patent number: 5606684Abstract: A buffer memory capable of storing contents of a plurality of tracks of a disk volume is provided in a disk controller or a disk drive, and in dump processing requested by a higher rank unit (CPU) to the disk controller, the data is immediately transferred from the buffer memory if the data to be dumped is present in the buffer memory, and if the data to be dumped is not present in the buffer memory, dump prefetching into the buffer memory is started and the execution of the dump processing is interrupted so that an on-line input/output operation other than the dump processing is accepted. When the dump prefetching into the buffer memory is over, the interrupted dump processing is resumed.Type: GrantFiled: October 7, 1994Date of Patent: February 25, 1997Assignee: Hitachi, Ltd.Inventors: Toshio Nakano, Masafumi Nozawa, Kiyoshi Hisano, Akihito Ogino, Akira Kurano, Hiroyuki Kitajima, Akihiko Togawa
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Patent number: 5584008Abstract: An external storage system connected to a host apparatus includes a plurality of storage devices, and a control unit for controlling the above described plurality of storage devices, wherein the above described control unit manages a storage space formed by the above described plurality of storage devices by dividing the storage space into a first storage pool to be directly accessed by the above described host apparatus and a second storage pool not to be directly accessed by the above described host apparatus.Type: GrantFiled: September 11, 1992Date of Patent: December 10, 1996Assignee: Hitachi, Ltd.Inventors: Akinobu Shimada, Masafumi Nozawa, Toshio Nakano
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Patent number: 5497472Abstract: 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: January 19, 1995Date of Patent: March 5, 1996Assignee: Hitachi, Ltd.Inventors: Akira Yamamoto, Shigeo Homma, Yoshihiro Asaka, Yoshiaki Kuwahara, Akira Kurano, Masafumi Nozawa, Hiroyuki Kitajima
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Patent number: 5410666Abstract: A buffer memory capable of storing contents of a plurality of tracks of a disk volume is provided in a disk controller or a disk drive, and in dump processing requested by a higher rank unit (CPU) to the disk controller, the data is immediately transferred from the buffer memory if the data to be dumped is present in the buffer memory, and if the data to be dumped is not present in the buffer memory, dump prefetching into the buffer memory is started and the execution of the dump processing is interrupted so that an on-line input/output operation other than the dump processing is accepted. When the dump prefetching into the buffer memory is over, the interrupted dump processing is resumed.Type: GrantFiled: September 17, 1990Date of Patent: April 25, 1995Assignee: Hitachi, Ltd.Inventors: Toshio Nakano, Masafumi Nozawa, Kiyoshi Hisano, Akihito Ogino, Akira Kurano, Hiroyuki Kitajima, Akihiko Togawa
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Patent number: 5313617Abstract: A data storage system comprises a magnetic disk, an optical disk, optical disk drive units, and optical disk transport devices for transporting the optical disk to the optical disk drive units as required. The data storage system further comprises a host system for receiving and transmitting a command and data in the format of the magnetic disk and a converter for converting the command and the data between the format of the magnetic disk and that of the optical disk. The optical disk, the optical disk drive unit and the optical disk transport device are controlled by a command and data in the format of the magnetic disk of the host system.Type: GrantFiled: March 14, 1991Date of Patent: May 17, 1994Assignee: Hitachi, Ltd.Inventors: Toshio Nakano, Masafumi Nozawa
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Patent number: 5253351Abstract: In a control unit having a external storage device, a method for selecting a loading method of data stored in the cache memory into the cache memory in accordance with an access pattern to the data, and an apparatus therefor are disclosed. The selection of the loading method is selection of control mode or procedure in accordance with the loading method, and it is attained by a learn function.Type: GrantFiled: August 8, 1989Date of Patent: October 12, 1993Assignees: Hitachi, Ltd., Microcomputer Engineering Ltd.Inventors: Akira Yamamoto, Toshiaki Tsuboi, Shigeo Honma, Hiroyuki Kitajima, Akira Kurano, Masafumi Nozawa, Katsunori Nakamura, Kosaku Kambayashi, Toshio Nakano, Yoshiro Shiroyanagi
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Patent number: 5243479Abstract: A housing for an information recording and reproducing apparatus is adapted for increased storage capacity and an increased operating speed by placing a relatively larger number of relatively smaller magnetic disks each having a relatively smaller mass and a relatively smaller recording and reproducing surface in an enclosure and housing the enclosure for a relatively larger magnetic disc in a box-like frame. A shock absorbing device is disposed between the enclosure and the box-like frame to absorb shock. A circuit assembly for controlling the operation of recording and reproducing is disposed outside the enclosure and between the frame and the enclosure.Type: GrantFiled: March 6, 1991Date of Patent: September 7, 1993Assignee: Hitachi Ltd.Inventors: Kazuo Nakagoshi, Akira Chuma, Kazuhisa Shiraishi, Masafumi Nozawa, Yoshihiro Moribe, Hideo Maekawa
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Patent number: 5235641Abstract: In an information processing system having an upper rank apparatus and an external storage device which performs transmission and reception of data between the storage device and the upper rank apparatus, at least one of encryption and decryption of the data by use of an algorithm controlled by a desired data key is performed in the external storage device, while generation, encryption and decryption of the data key are performed on the upper rank apparatus side. By this configuration, the burden of the upper rank apparatus is largely reduced and the secrecy of data stored in the external storage device can be surely kept without spoiling the throughput of the whole system.Type: GrantFiled: March 12, 1991Date of Patent: August 10, 1993Assignee: Hitachi, Ltd.Inventors: Masafumi Nozawa, Akinobu Shimada, Toshifumi Nishimura, Katsuharu Kakuse, Tokuhiro Tsukiyama, Kiyoshi Yata, Yasuhiro Ishii, Kazuo Takaragi, Yasushi Kuba, Fujio Fujita