1
Shunji Kawamura, Yoshiaki Eguchi: Data processing system. Hitachi, Townsend and Townsend and Crew, February 5, 2008: US07328373 (61 worldwide citation)

In a data processing system Saving a primary site and a secondary site, storage systems are connected to each other via a communication line, data update history is recorded in a storage device as a journal in the primary site, and the journal is transferred to the secondary site via the communicati ...


2
Takashige Iwamura, Kazuhisa Fujimoto, Yoshiaki Eguchi, Shunji Kawamura: Flash memory storage system. Hitachi, Brundidge & Stanger P C, December 29, 2009: US07640390 (60 worldwide citation)

A flash memory storage system has a plurality of flash memory devices comprising a plurality of flash memories, and a controller having an I/O processing control unit for accessing a flash memory device specified by a designated access destination in an I/O request received from an external device f ...


3
Kazuhiko Mogi, Norifumi Nishikawa, Yoshiaki Eguchi: Cache management method for storage device. Hitachi, Mattingly Stanger Malur & Brundidge P C, September 13, 2005: US06944711 (56 worldwide citation)

A cache management method disclosed herein enables optimal cache space settings to be provided on a storage device in a computer system where database management systems (DBMSs) run. Through the disclosed method, cache space partitions to be used per data set are set, based on information about proc ...


4
Hiroshi Arakawa, Kazuhiko Mogi, Yoshiaki Eguchi, Kouji Arai: Data reallocation among storage systems. Hitachi, Townsend Townsend and Crew, July 20, 2004: US06766430 (50 worldwide citation)

The present invention provides techniques, including a method and system, for relocating data between storage systems. In one embodiment of the present invention a host collects usage information from a plurality of storage systems, and determines the relocation destination LU for data stored in the ...


5
Akira Deguchi, Yoshiaki Eguchi, Kenta Ninose: Storage system creating a recovery request point enabling execution of a recovery. Hitachi, Antonelli Terry Stout & Kraus, August 4, 2009: US07571348 (49 worldwide citation)

When an event occurs in a storage system that is not recognized by a host, it is not possible to recover data at the point before and after this event. Provided is a storage system including a first storage area storing data to be used by a computer, and a second storage area for storing updated dat ...


6
Kazuhiko Mogi, Yoshiaki Eguchi, Takao Satoh: Data mapping management apparatus. Hitachi, Townsend and Townsend and Crew, October 24, 2006: US07127445 (40 worldwide citation)

A data mapping management server collects data mapping information about functions for providing virtual storage regions, and provides an administrator with a management view on which the virtual storage regions created/managed in each virtual storage region providing function can be comprehensively ...


7
Yoshiaki Eguchi, Hiroshi Arakawa, Yasutomo Yamamoto, Takashige Iwamura, Kouji Arai: Method and apparatus for data relocation between storage subsystems. Hitachi, Mattingly Stanger Malur & Brundidge P C, May 17, 2005: US06895483 (40 worldwide citation)

A storage subsystem that has detected the necessity of the data relocation determines whether the data relocation is possible or not from one storage unit to another within the particular storage subsystem. A virtualization device is notified in the case where the data relocation in the particular s ...


8
Hiroshi Ohno, Kouji Arai, Toshio Nakano, Hideo Tabuchi, Akinobu Shimada, Ai Satoyama, Yasutomo Yamamoto, Yoshiaki Eguchi: Method for controlling storage system, and storage control apparatus. Hitachi, Mattingly Stanger Malur & Brundidge P C, May 23, 2006: US07051121 (37 worldwide citation)

A method for controlling a storage system including a host computer, and a first and a second storage control apparatuses each receiving a data input/output request from the host computer and executing a data input/output process for a storage device in response to the request, comprises connecting ...


9
Takahiro Nakano, Koji Sonoda, Yoshiaki Eguchi, Takashi Horiuchi, Katsumi Hirezaki: Method of maintaining a plurality of snapshots, server apparatus and storage apparatus. Hitachi, Townsend and Townsend and Crew, June 26, 2007: US07237076 (34 worldwide citation)

Snapshots are implemented by combining original data in a place where an operational volume has been updated with data in a place where the operational volume has not been updated. A snapshot management table maintains a value indicating that update has not been conducted, or a storage place of orig ...


10
Hiroshi Arakawa, Kazuhiko Mogi, Yoshiaki Eguchi, Kouji Arai: Data reallocation among storage systems. Hitachi, Townsend and Townsend and Crew, July 13, 2004: US06763442 (25 worldwide citation)

The present invention provides techniques, including a method and system, for relocating data between storage systems. In one embodiment of the present invention a host collects usage information from a plurality of storage systems, and determines the relocation destination LU for data stored in the ...