Fujitsu Corporation

Yuuji Hanaoka

Terumasa Haneda

Yuichi Ogawa

Toshiyuki Yoshida

Hidenori Takahashi

Kazunori Masuyama

Toshihiro Tomozaki

In a method of controlling an information processing system in which an information processing device is connected to each of a plurality of input/output ports provided in a routing device and having a first property or a second property, for conducting data transmission among the information processing devices via the routing device, a step of causing all of the information processing devices to halt data transmission, a step of resetting properties and identification information of the input/output ports with the second properties other than the input/output port with the first property which cannot be used, in the routing device, and a step of causing the information processing devices to restart the data transmission after the reset of the identification information are executed.

Method of controlling information processing system, information processing system, direct memory access control device and program

A DMA apparatus which reads data corresponding to a descriptor from memory, and a dividing unit in a descriptor management device divides one descriptor into a plurality of sub-descriptors. A plurality of DMA controllers produce a plurality of reading requests for reading data corresponding to the plurality of sub-descriptors from the memory. A memory controller reads the corresponding data from the memory according to the plurality of reading requests.

Data transfer apparatus by direct memory access controller

A file control system performing DMA (direct memory access) transfer is provided. The file control system includes file control devices, and each of the file control devices is provided between a host computer and an external storage device. A first file control device among the file control devices checks for errors in the data read from a memory, changes the error detection code added to the read data from a first error detection code to a second error detection code, changes at least a part of the data when an error is detected, and executes DMA-transfer of the data, which is changed or is not changed, to a second file control device of the transfer destination.

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Kawasaki, Japan

Yuuji Hanaoka