Abstract: In the circumstance of high energy physics experiments, usually a large amount of experimental data is pro- duced every day. Also the high energy physics experiments are regional-crossing. Because of this feature, the experimen- tal data needs to be transferred to the remote data center and the computing center for data analysis. So how to transfer the data to the remote data center and computing center reliably and efficiently in real time is an important problem which needs to be solved for carrying on a high energy physics experiment successfully. This paper presented a mass da- to real-time transfer system under the environment of high energy physics. I}his system provides the interfaces with the data generation system and the data management system, and can transmit the experiment data from onsite to the re- mote data center and computing center reliably. I}he functionalities of the system include; multipath source data scan- ning, data transmitting, data buffer automatic releasing, data management interface, data transmitting performance moni- toring and logging and etc. I}he system also provides multi-flow concurrent transmission in order to solve the high delay in WAN and improve the transmission efficiency. In addition, to solve the single point problems caused by the network status or failure of the transmission point, the system also supports data relaying to make the system work robustly and reliably. Experiments show that the system performs well in data transmission process under the environment of high energy physics.

Key words: Mass data, Real-time transmission, Reliable transmission, Multi-flow concurrency, Data relay