US 7,069,305 B2Granted

Computer system and a data transfer method thereof using remote direct memory access

AssigneeHitachi, Ltd.

InventorsKazuyoshi Serizawa, Hirofumi Nagasuka, Taketoshi Sakuraba, Kenta Ninose, Masahiro Yamashita

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Abstract

In the data transfer method between a couple of computer nodes in the related art, an overhead for the waiting between programs to conduct the data transfer is considerably large. In the present invention, a first program to transmit data stores the data to the main storage area in the desired time interval. A second program to receive data refers to the above area using RDMA in the desired time interval. Otherwise, the second program to receive data refers to the main storage in the desired time interval. A first program to transmit data stores data to above area using RDMA in the desired time interval. Moreover, in order to detect the passing between the write and read operations, an identifier is provided to each record and the access sequence of the identifier and record is inverted in the read and write operations. Or, an identifier and an error checking code are added to each record.

Claims10

Dependent claims

A computer system including a first computer node and a second computer node connected to said first computer node, comprising:

a first storage area for storing data records;
a first processor provided with said first computer node for storing the data records to said first storage area asynchronously with said second computer node with a free time interval;
a transmitter provided with said first computer node for sending the data records stored in said first storage area;
a second storage area for storing the data records copied from said first storage area;
a receiver provided with said second computer node and connected to said transmitter via a network for requesting said transmitter to send a record group of the data records stored in said first storage area via said network and designated by a request command sent by said receiver, receiving the record group of the data records from said transmitter via said network and storing the record group of the data records to said second storage area;
and
a second processor for designating the record group of the data records, to be read from said first storage area using address information of said first storage area in a free time interval asynchronously with storing executed by said first processor and for letting said receiver send the request command to said transmitter,
wherein said transmitter reads the record group of the data records designated by the request command sent from said receiver and sends the record group of the data records to said receiver in response to the request command via said network, and
wherein said first processor stores each record group of the data records into said first storage area with an identifier number indicating a sequence of storing of the each record group of the data records, said transmitter sends the record group of the data records to said receiver in reverse order of the sequence of storing, and said second processor refers to the record group of the data records in said first storage area copied to said second storage area based on the reverse order in order to determine whether the relevant record group of the data records are correct or not depending on said identifier number.

6 more elements

A computer system comprising:

a first computer node including a first processor, a first memory coupled to said first processor, and a transmitter coupled to said first processor and said first memory;
a second computer node including a second processor, a second memory coupled to said second processor, and a receiver coupled to said second processor and said second memory;
a network being coupled to said transmitter and said receiver,
wherein said first processor stores a plurality of data records into said first memory based on a first timing;
wherein said second processor indicates said receiver to send a read request, which includes information indicating a part of the plurality of data records stored in said first memory, to said transmitter via said network based on a second timing which is independent of the first timing of storing the plurality of data records into said first memory, and said second processor makes the information indicating a part of the plurality of the data records by using address information of said first memory,
wherein said receiver sends the read request to said transmitter via said network in response to the indication of said second processor and said transmitter reads the part of the plurality of data records from said first memory and sends the part of the plurality of data records to said receiver via said network in response to the read request,
wherein said receiver stores the part of the plurality of data records received from said transmitter into said second memory,
wherein said first processor stores the plurality of data records with a sequence number, wherein said second processor makes the information indicating the part of the plurality of data records stored in said first memory based on the sequence number, wherein said transmitter sends the part of the plurality of data records in reverse order of the sequence number, and wherein said receiver stores the part of the plurality of data records into said second memory in reverse order of the sequence number.

5 more elements

Dependencies are inferred from the claim text.