Kabushiki Kaisha Toshiba

Hiroshi Kaibe

Tetsuo Hasegawa

Toshibumi Seki

Shinsuke Tamura

Yasukuni Okataku

Hideaki Sato

Haruhiko Toyama

Takayuki Miyazawa

Takashi Moriyasu

Data processing system, computer network, and data processing method

Data processing systems, each belonging to one of a number of program groups, are connected to a network. Each group includes a data processing system containing a sequencer which determines the sequence of messages transferred over the network. The sequencer of each data processing system is either in the &ldquo;operation mode&rdquo; or in the &ldquo;standby mode.&rdquo; A sequencer in the standby mode declares the operation mode independently of other sequencers and sends this operation mode declaration to the sequencers of the other data processing systems. When the operation mode declaration is sent a number of times equal to a specified count, the sequencer becomes the operation mode sequencer. When the operation mode sequencer stops, some other standby mode sequencer takes over the function of the operation mode sequencer, thus maintaining consistency in the sequence of messages to be sent to a plurality of data processing systems connected to the network.

System and method that prevent messages transferred among networked data processing systems from becoming out of sequence

When inexecutable event occurs, an event format conversion rules table is referred to in order to convert the format of the event, then the communication message including the converted event is transmitted through a network. If the communication message is received through the network, the converted event is re-converted into an event that has an executable format by referring to the event format conversion rules table. An event filter refers to an event filter table that has processing necessity information for each event and sends only an event that needs to be processed to an event processing portion. Even if the local system cannot execute an event, the event is transmitted to another system through a communicating portion.

Event controlling system for integrating different event driven systems

A high-reliability file system which surely keeps multiple file data on one drive even if some drives have failed. If renewal of a plurality of blocks of a disk by data in a buffer is necessary, a buffer manager renews the disk by all the data in the buffer which are to be renewed in the future. Flush management is carried out by the drive and the buffer manager. If another drive is 'examining' or 'renewing' when a flush (renewal) is to be executed, a sequencing means temporarily restrains the buffer manager from starting the flush.

Distributed file system for renewing data with high integrity

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Tokyo, Japan

Hiroshi Kaibe