Nec Corporation

Mitsubishi Denki Kabushiki Kaisha

Renesas Electronics Corporation

Sony Corporation

Satoshi Yamakawa

Akihiko Furukawa

Tsuyoshi Kawakami

Takumi Nakahata

Takashi Torii

Yoshihiro Kajiki

Masao Kondo

Yutaka Hoshino

Tetsuya Iida

Yasunori Tokuda

Taisuke Furukawa

Shigemitsu Maruno

Yuji Abe

Nobuyoshi Hattori

Junji Nakanishi

Kazuhiro Suzuki

Toshiyuki Nishihara

Masaki Kan

Yasuhiro Kagawa

Masafumi Kimata

Jun Ishikawa

Dai Kobayashi

Yoshihiko Toyoda

Katsuya Nakashima

Masao Yamawaki

Yuji Kaneko

Yukihisa Tsuneda

Kohei Sugihara

Takahiro Ohnakado

Yasutaka Nishioka

Wataru Katsurashima

A storage node administration device enables setting a logical capacity of a storage region based on an I/O performance value of a storage node. In a distributed data storage system, the storage node administration device includes a setting unit setting at least one reference node from a plurality of storage nodes having different I/O performances, dividing a storage region of the storage nodes other than the reference node into a first storage region and a second storage region, referring to the I/O performance and the logical capacity of the reference node, and setting the logical capacity of each region to match the I/O performance of the storage nodes other than the reference node; a determination unit determining system configuration information which reflects a configuration change of the distributed data storage system; and a transmission unit transmitting the system configuration information to the storage nodes having different I/O performances.

Storage node, storage node administration device, storage node logical capacity setting method, program, recording medium, and distributed data storage system

A distributed storage device according to the present invention includes: a plurality of storage nodes, the plurality of storage nodes includes: a data storage unit that accumulates stream data output from a device; a first time frame generation unit that generates a time frame synchronized with another storage node and associates a data element included in stream data accumulated in the data storage unit with one of time frames; a data selection unit that selects a data element associated with a predetermined time frame from the stream data accumulated in the data storage unit, based on an access request from a client terminal; and a data transmission unit that transmits a data element selected by the data selection unit to the client terminal.

Distributed storage device, storage node, data providing method, and medium

A file storage apparatus comprises: duplication determination unit that determines whether file supplied from client apparatus and file stored in storage unit coincide with each other in same format, and stores the file supplied from client apparatus in the storage unit if the files do not coincide in the same format; and storage management unit that associates, if duplication determination unit determines that the files coincide in the same format, format of the file supplied from the client apparatus with the file stored in the storage unit, reads file stored in the storage unit in response to file read request from client apparatus, converts, if format associated with the read file exists, the read file into the format, and provides the converted file.

File storage apparatus, file storage method, and program

In order to realize a wider bandwidth of a frequency characteristic of a power amplification circuit, outputs of differential push-pull amplifiers which are matched at respectively different frequencies are combined together by secondary inductors, and the combined signal is outputted.

Power amplification circuit having transformer

A power amplifier comprises a plurality of primary inductors provided on a substrate in a circular geometry as a whole; a plurality of amplifier pairs; a secondary inductor; and a connection wiring. Each amplifier pair is coupled to two ends of a corresponding primary inductor, and amplifies and output to the corresponding primary inductor a pair of first and second signals given as differential input signals, respectively. The secondary inductor is provided adjacent to the primary inductors in a circular geometry, further combines and outputs signals made by combining first and second signals in each primary inductor. The connection wiring is provided inside the primary inductors on the substrate and electrically couples middle points of respective primary inductors with each other.

Power amplifier

A system which includes at least one client, a plurality of file servers, each having a file system, and a switch logically arranged between the client and the plurality of file servers to provide file access services which virtually render the plurality of file systems accessible as a single file system, termed a 'pseudo file system', when viewed from the terminal. The switch distributes a command that starts generation of snapshots to the plurality of file servers, which file servers formulate respective snapshots responsive to the command that starts formation of the snapshots. The switch sets the plurality of snapshots, generated by the plurality of file servers, so as to be associated with the file system structure of the virtual file system at the time of formation of the snapshots.

Switch device, system, backup method and computer program

Disclosed is a system in which an index registration unit registers an index, which will be used for search processing, as a partitioned index which is partitioned on a time series basis, and a search means reads indexes older than a specified point in time, which is used as a search base point, to perform search processing, thereby searching for information based on a point in time in the past.

Information document search system, method and program for partitioned indexes on a time series in association with a backup document storage

Disclosed is a data management apparatus comprising a message transfer/analysis unit that receives an object data access request from a client and returns a response; an object metadata storage unit that stores, as metadata, a set of ancillary information on data for an object and a data area corresponding to the ancillary information; an object metadata management unit that performs reading, updating, and registration processing for the metadata; a data conversion unit that sends the data access request to a data access unit, extracts object data; and a data access unit that sends a data access command, specified by the data conversion unit, to a file server or a database server and sends response data, received from the file server or the database server, to the data conversion unit.

Data management apparatus, method and program

A power amplifier amplifying and compositing differential signals and capable of suppressing harmonics is provided. The power amplifier includes first amplifiers amplifying a first input signal and a second input signal, which are differential signals, a first coil receiving the first input signal and the second input signal amplified by the first amplifiers, a second coil magnetically coupled with the first coil and outputting a composite signal of the amplified first input signal and second input signal, a third coil magnetically coupled with the second coil, and a first capacitor coupled between both ends of the third coil, wherein one end of the first capacitor is coupled to a ground node.

Power amplifier having transformer

Disclosed is a storage management system including at least one client, a first server having a primary storage, a second server having a secondary storage, and an intermediate device logically arranged between the client and the first and second servers. The primary storage includes a stub file in which there is recorded the position information of the real file migrated from the primary storage to the secondary storage. The intermediate device exercises control so that, when a file access request of the primary storage of a first server, issued by the client, is received by the intermediate device, the intermediate device receives the file access request and, if the file to be accessed is a stub file, and the access request necessitates accessing to the real file, the intermediate device accesses the real file of the secondary storage using the information of the stub file to return a response.

Storage management system and method and program

When a migration object is a stub file, a data migration apparatus, which migrates data from a source HSM execution environment to a destination HSM execution environment, reads data from source secondary storage based on a data storage address in the source secondary storage. This data storage address is stored in the stub file in source primary storage. The apparatus writes the data into destination secondary storage according to a rule for storing data and reads attribute information on the stub file stored in the source primary storage. The apparatus creates, in destination primary storage, a stub file having the same name as in the source and, according to the stub file generation format in the destination primary storage, supplies the address of the data stored in the destination secondary storage and attribute information acquired from the source primary storage to the created stub file to complete the data migration.

Data migration apparatus, method, and program for data stored in a distributed manner

Growing community of inventors

Tokyo, Japan

Satoshi Yamakawa