Hitachi, Ltd.

Takashi Nishikado

Yasuhiro Takahashi

Fumio Noda

Yoshiteru Takeshima

Hideo Aoki

Hiroyuki Kumazaki

Koji Sonoda

Naoki Utsunomiya

Takanori Miyamoto

Daisuke Yokota

Kenji Kawakita

Megumu Kondo

Fumiya Murata

Yuichi Taguchi

Kenichi Yoshida

Naonobu Sukegawa

Masahiko Nakahara

Kei Nakajima

Fujio Fujita

Kansuke Kuroyanagi

Masakazu Fukagawa

Kazuhiko Fukuoka

Akihiro Nakaya

Nobuo Yamamoto

Yoshihiro Tanaka

Kouzou Hatakeyama

A congestion control and avoidance method including a method check step of determining whether the request contents is cacheable or uncacheable on the basis of the request inputted from the client terminal, a first Uniform Resource Identifier (URI) check step of, when it is determined that the request contents is cacheable in the method check step, checking a URI included in the request from the client terminal to determine whether the request contents is cacheable or uncacheable, a first URI hash search step of, when it is determined that the request contents is cacheable based on determination of the first URI check step, searching a URI hash to determine to execute any of regular caching, priority caching and access limitationing operation, and a step of executing any of the regular caching, priority caching and access limitationing operation according to determination in the first URI hash search step.

Congestion control and avoidance method in a data processing system

It is possible to control the data transfer between a proxy server apparatus and an application server that is connected to the proxy server apparatus. A value added service control command is added to an request message and/or the response data. In accordance with the value added service control command included in the request message, a first proxy servercontrols whether it relays this request message directly to a destination and it relays this request message to the destination after transferring this request message to an application serverand applying the value added service. Further, based on the value added service control command which is included in the response data, the first proxy servercontrols whether it relays this response data directly to a destination or it relays this response data to the destination after transferring this response data to the application serverand applying the value added service.

Proxy server apparatus and method for providing service using the same

It is possible to control the data transfer between a proxy server apparatus and an application server that is connected to the proxy server apparatus. An value added service control command is added to an request message and/or the response data. In accordance with the value added service control command included in the request message, a first proxy server Ia controls whether it relays this request message directly to a destination and it relays this request message to the destination after transferring this request message to an application server 7 and applying the value added service. Further, based on the value added service control command which is included in the response data, the first proxy server Ia controls whether it relays this response data directly to a destination or it relays this response data to the destination after transferring this response data to the application server 7 and applying the value added service.

A server system for providing services from servers to clients can provide prompt responses and various services with small-scale server apparatuses. Data transmission between the servers and the clients is performed by means of data processing relay apparatuses. The server adds processing control information to data to be requested. The data processing relay apparatus performs processings on requested data transmitted from the servers in accordance with the processing control information in providing a service to the client apparatuses.

Service system

A service system in which a server offers a service in response to a request from a client. The system can offer the stable service even in the case of an access from the client and also can offer a preferential service under certain conditions. The request from the client to the server is carried out via a data communication forwarding apparatus, the apparatus has a unit for queuing the request with a priority and has a unit for changing the forwarding sequence of the request according to the priority. Thereby the number of simultaneous requests to the server can be suppressed to within the processing ability of the server with the stable service. Further, the request can be preferentially processed according to the user, transaction, wait time, etc.

Data communication system using priority queues with wait count information for determining whether to provide services to client requests

An object of the present invention is to provide a communication proxy apparatus that achieves a high-speed access to latest information by making full use of a cache data in response to an access request for the information data without changing a server device or a client device, and that realizes high-speed access control using a simple instruction. The communication proxy apparatus additionally comprises:

Communication proxy device

A proxy processing method to flexibly add/modify customized operations, such as customized user authentication and accounting, is provided. A state transition engine stores state information and moves processing forward by updating states. It has the following characteristics. (1) a state transition table indicating a proxy processing procedure is generated from a state definition file at start-up (i-(i)). (2) A state transition engine implements proxy processing according to the state transition table (-()). (3) A feature is provided to add an extended region for extended features to the session management table. (()). Also, with regard to extended logging: (1) An extended log definition file indicates extended log information to be logged (-()). (2) Extended log information based on the extended log definition is stored in the session management table (-()). (3) Each access log provides two types of separate information, a fixed-length standard log and a variable-length extended log.

Proxy processing method

A communication network including connection switching exchanges, such as an ATM, a connection management apparatus is provided in a network management unit of a communication network. A group of logical connections with a fixed group size and consecutive identifiers assigned to the connections is treated as a unit. The number of logical connections in the group is an integer with a power of 2. The logical connections and connection identifiers assigned to the logical connections are set up and released in connection setting units each equal to a multiple of the group size in a unitary manner across the network. A priority level is assigned to each connection setting unit. When logical connections have been set for connection setting units sharing the same connection identifiers, logical connections with the shared connection identifiers pertaining to a connection setting unit with a smaller size is considered to be valid.

Connection switching apparatus, connection switching network contol system and connection switching network control method

A storage medium for a file input/output control system having a plurality of first computers each having a plurality of disks and connected to a network and at least one second computer connected to the network for accessing the disks connected to the first computers. The storage medium includes a data code section storing a step of retrieving a plurality of first data access requests issued from a plurality of processes of an application and comparing the first data access requests with correspondence relation defining information to confirm that the first data access requests are accesses to the disks, a data code section storing a step of creating a plurality of second data access requests to the disks from the first data access requests confirmed to be accesses to the disks and transmitting the second data access requests to the network, and a data code section storing a step of, in each first computer, rearranging the second data access requests for each disk in the order of block numbers in each disk.

High speed file I/O control system with user set file structure to effect parallel access pattern over a network

In a communication network constituted of relay nodes and edge nodes interconnected by communication lines and a network manager, the network manager manages relay nodes and edge nodes connected to the network manager by operation management communication lines. The network manager requests to set a logical connection between an ingress and an egress of the connection, and in response to this request, relay nodes and edge nodes set a logical connection specifying at least one of a transmission source and a destination.

Network manager, nodes and network management system

In a communication network including connection switching exchanges such as an ATM, a connection management means is provided in a network management unit of the communication network. A group of logical connections with a fixed group size and consecutive identifiers assigned to the connections is treated as a unit. The number of logical connections in such a group is an integer with power of 2. Logical connections in the communication network and connection identifiers assigned to the logical connections are set up and released in connection setting units each equal to a multiple of the group size in a unitary manner across the whole communication network. A priority level is assigned to each connection setting unit. When logical connections have been set for a plurality of connection setting units sharing the same connection identifiers, logical connections with the shared connection identifiers pertaining to a connection setting unit with a smallest size is considered to be valid.

Connection switching apparatus, connection switching network control system and connection switching network control method

A file input/output control system has first computers each having disks and connected to a network; and at least one second computer connected to the network for accessing the disks connected to the plurality of first computers, the second computer having: a retriever for retrieving first data access requests issued from a plurality of processes of an application and comparing the first data access requests with correspondence relation defining information to thereby confirm that the first data access requests are accesses to disks, the correspondence relation defining information being entered by a user in advance and indicating a correspondence relation between the disks and each of regions in a file stored in disks of the first computers; and a scheduler for creating second data access requests to the disks from first data access requests confirmed to be accesses to disks, in accordance with the correspondence relation defining information between the disks and each of the regions in a file stored in the disks of the first computers, and transmitting the second access requests to the network, wherein the first computers access the disks in accordance with the second data access requests received via the network. Each of the first computers has a rearranger for rearranging second data access requests for each of the disks in the order of block numbers in each of the disks. Each of the first computers has a merger for merging, upon detection of that the second data access requests to each of the disks contain data access requests to a continuous disk field, the disk access requests to one disk access request. Although two-dimensional array data distributively stored in the first computers is defined in a row direction, in response to an access command for referring to the two-dimensional array data in a column direction, the network driver reads data containing unnecessary data from the disks, transmits the data containing unnecessary data to each of the second computers, and each of the second computers filters the data containing unnecessary data to discard the unnecessary data and obtain necessary data for the second computer.

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Ebina, Japan

Takashi Nishikado