Patents by Inventor Teruo Nagasawa
Teruo Nagasawa 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: 7213114Abstract: Two data centers located in the vicinity are connected using a synchronous transfer copy function, and one of the data centers is coupled with a third data center disposed at a remote location by an asynchronous remote copying function. The order whereat a storage sub-system located in the vicinity has received data from a host is consistently guaranteed, and the third data center holds the data. Further, each storage sub-system includes a function whereby, during normal operation, data can be exchanged and the data update state can be obtained by the storage sub-systems located in the two data centers that do not directly engage in data transmission.Type: GrantFiled: August 12, 2004Date of Patent: May 1, 2007Assignee: Hitachi, Ltd.Inventors: Toshio Nakano, Katsunori Nakamura, Mikito Ogata, Yoshinori Okami, Seiichi Higaki, Hiroshi Abei, Shigeru Kishiro, Teruo Nagasawa, Takeshi Koide
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Patent number: 7200729Abstract: A storage system which includes a first storage device, and a storage control device connected to a higher level device and the first storage device. The storage control device controls reading or writing of data from or to the higher level device to or from the storage control device. The storage control device can be connected to another storage control device, and can acquire device information of the other storage control device.Type: GrantFiled: June 30, 2005Date of Patent: April 3, 2007Assignee: Hitachi, Ltd.Inventors: Teruo Nagasawa, Takeshi Koide, Katsunori Nakamura
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Patent number: 7114049Abstract: A storage apparatus system comprises first and second data storage systems. The first data storage systems can copy an image of data stored therein to the second data storage system without affecting access to storage in the first data storage system. In addition, failover processing is provided between the first and second data storage systems, wherein the second data storage system serves as the failover system.Type: GrantFiled: September 12, 2003Date of Patent: September 26, 2006Assignee: Hitachi, Ltd.Inventors: Kyosuke Achiwa, Takashi Oeda, Katsunori Nakamura, Teruo Nagasawa, Takeshi Koide
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Patent number: 7069403Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: GrantFiled: October 14, 2003Date of Patent: June 27, 2006Assignee: Hitachi, Ltd.Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Patent number: 6988176Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: GrantFiled: May 12, 2003Date of Patent: January 17, 2006Assignee: Hitachi, Ltd.Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Publication number: 20050240741Abstract: A storage system which includes a first storage device, and a storage control device connected to a higher level device and the first storage device. The storage control device controls reading or writing of data from or to the higher level device to or from the storage control device. The storage control device can be connected to another storage control device, and can acquire device information of the other storage control device.Type: ApplicationFiled: June 30, 2005Publication date: October 27, 2005Inventors: Teruo Nagasawa, Takeshi Koide, Katsunori Nakamura
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Patent number: 6950917Abstract: A storage system which includes a first storage device, and a storage control device connected to a higher level device and the first storage device. The storage control device controls reading or writing of data from or to the higher level device to or from the storage control devices. The storage control device can be connected to another storage control device, and can acquire device information of the other storage control device.Type: GrantFiled: March 7, 2003Date of Patent: September 27, 2005Assignee: Hitachi, Ltd.Inventors: Teruo Nagasawa, Takeshi Koide, Katsunori Nakamura
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Publication number: 20050120093Abstract: Two data centers located in the vicinity are connected using a synchronous transfer copy function, and one of the data centers is coupled with a third data center disposed at a remote location by an asynchronous remote copying function. The order whereat a storage sub-system located in the vicinity has received data from a host is consistently guaranteed, and the third data center holds the data. Further, each storage sub-system includes a function whereby, during normal operation, data can be exchanged and the data update state can be obtained by the storage sub-systems located in the two data centers that do not directly engage in data transmission.Type: ApplicationFiled: August 12, 2004Publication date: June 2, 2005Applicant: Hitachi, Ltd.Inventors: Toshio Nakano, Katsunori Nakamura, Mikito Ogata, Yoshinori Okami, Seiichi Higaki, Hiroshi Abei, Shigeru Kishiro, Teruo Nagasawa, Takeshi Koide
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Publication number: 20050021627Abstract: A storage apparatus system comprises first and second data storage systems. The first data storage systems can copy an image of data stored therein to the second data storage system without affecting access to storage in the first data storage system. In addition, failover processing is provided between the first and second data storage systems, wherein the second data storage system serves as the failover system.Type: ApplicationFiled: September 12, 2003Publication date: January 27, 2005Applicant: Hitachi, Ltd.Inventors: Kyosuke Achiwa, Takashi Oeda, Katsunori Nakamura, Teruo Nagasawa, Takeshi Koide
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Patent number: 6845435Abstract: According to the present invention, techniques for performing real time backup of data in the presence of a pending hazard, such as a natural disaster, or the like. Embodiments can provide data storage controllers, networked data storage systems, methods and the like, that detect imminent hazardous conditions and alter backup behavior to provide greater integrity of backed up data. In a representative embodiment according to the present invention, update of the primary data is temporarily suspended after the recognition of a probable occurrence of a hazardous event. By suspending updating the primary data temporarily, the increase of un-updated secondary data can be prevented, so that lost data is decreased. Then, the un-updated secondary data can be updated quickly or exclusively, in order to avoid un-updated secondary data.Type: GrantFiled: January 14, 2004Date of Patent: January 18, 2005Assignees: Hitachi, Ltd., Hitachi Information Technology Co., Ltd.Inventors: Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Publication number: 20040153604Abstract: According to the present invention, techniques for performing real time backup of data in the presence of a pending hazard, such as a natural disaster, or the like. Embodiments can provide data storage controllers, networked data storage systems, methods and the like, that detect imminent hazardous conditions and alter backup behavior to provide greater integrity of backed up data. In a representative embodiment according to the present invention, update of the primary data is temporarily suspended after the recognition of a probable occurrence of a hazardous event. By suspending updating the primary data temporarily, the increase of un-updated secondary data can be prevented, so that lost data is decreased. Then, the un-updated secondary data can be updated quickly or exclusively, in order to avoid un-updated secondary data.Type: ApplicationFiled: January 14, 2004Publication date: August 5, 2004Applicants: Hitachi, Ltd., Hitachi Information Technology Co., Ltd.Inventors: Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Publication number: 20040078535Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: ApplicationFiled: October 14, 2003Publication date: April 22, 2004Applicant: Hitachi, Ltd.Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Publication number: 20040068628Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: ApplicationFiled: May 12, 2003Publication date: April 8, 2004Applicant: Hitachi, Ltd.Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Patent number: 6684306Abstract: According to the present invention, techniques for performing real time backup of data in the presence of a pending hazard, such as a natural disaster, or the like are disclosed. Embodiments of the invention provide data storage controllers, networked data storage systems, methods and the like, that detect imminent hazardous conditions and alter backup behavior to provide greater integrity of backed up data. In a representative embodiment according to the present invention, update of the primary data is temporarily suspended after the recognition of a probable occurrence of a hazardous event. By suspending updating the primary data temporarily, the increase of un-updated secondary data can be prevented, so that lost data is decreased. Then, the un-updated secondary data can be updated quickly or exclusively, in order to avoid un-updated secondary data.Type: GrantFiled: July 14, 2000Date of Patent: January 27, 2004Assignee: Hitachi, Ltd.Inventors: Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Patent number: 6665781Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: GrantFiled: April 19, 2001Date of Patent: December 16, 2003Assignee: Hitachi, Ltd.Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
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Patent number: 6647476Abstract: In order to enable data migration between old and new subsystems to be performed under stopless operation, a plurality of first access paths and are prepared between a CPU and an old CU (old subsystem) having an old VOL and a plurality of third access paths and are set between the old CU and a new CU (new subsystem) having a new VOL. The connection is switched from the first access paths and of the old subsystem as a replacement source to the second access paths and of the new subsystem as a replacement destination on a plurality of occasions. When the CPU accesses the new subsystem via the second access paths and on the new subsystem side during the connection change, a path replacement controller relays the access to the old subsystem via the third access paths and and allows the access to be processed. Data migration from the old subsystem to the new subsystem is executed after all of the first access paths are switched to the second access paths.Type: GrantFiled: December 22, 2000Date of Patent: November 11, 2003Assignee: Hitachi, Ltd.Inventors: Teruo Nagasawa, Takeshi Koide, Katsunori Nakamura
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Publication number: 20030145169Abstract: A storage system which includes a first storage device, and a storage control device connected to a higher level device and the first storage device. The storage control device controls reading or writing of data from or to the higher level device to or from the storage control device. The storage control device can be connected to another storage control device, and can acquire device information of the other storage control device.Type: ApplicationFiled: March 7, 2003Publication date: July 31, 2003Inventors: Teruo Nagasawa, Takeshi Koide, Katsunori Nakamura
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Patent number: 6584473Abstract: By assuring and maintaining consistency of data within a range expected by the user, significance of the consistency of data is assured. A master control unit 105 to which write data and its write time is transferred from an information processor 100 is provided with a function of obtaining the latest write time and the oldest write time of write data which has not been copied to each of remote control units 115 as a copy destination at proper timings and comparing the difference between the latest and oldest write time with a preset time on the basis of a data consistency unit such as a data set. When the difference reaches or exceeds the present time, data within the data consistency assuring range is suspended or write data and copy data is regulated.Type: GrantFiled: October 28, 1999Date of Patent: June 24, 2003Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.Inventors: Takahisa Kimura, Takeshi Koide, Yasushi Saitsu, Teruo Nagasawa
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Publication number: 20030078903Abstract: By assuring and maintaining consistency of data within a range expected by the user, significance of the consistency of data is assured.Type: ApplicationFiled: October 28, 1999Publication date: April 24, 2003Inventors: TAKAHISA KIMURA, TAKESHI KOIDE, YASUSHI SAITSU, TERUO NAGASAWA
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Publication number: 20020046330Abstract: With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.Type: ApplicationFiled: April 19, 2001Publication date: April 18, 2002Inventors: Tooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide