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中国SKA区域中心跨洲际高速数据传输进展及展望

Progress and Prospect of transcontinental high-speed data transmission at SKA Regional Center in China

摘要:平方公里阵列望远镜(SKA)作为最大的射电望远镜,其观测产生的数据将首先由澳大利亚和南非两个台址国传输到百公里左右的科学数据处理中心,然后通过高速网络分发到上万公里距离的各个SKA区域中心。具有SKA 10%规模的SKA1阶段,每年预计有750PB的数据需要通过至少100Gbps的网络分发到各个SKA区域中心(SRC),如此高的网络带宽和数据规模对数据的传输分发带来极大挑战。本文通过对TCP/UDP/HTTP等不同网络协议的分析,并使用当前射电天文领域不同的软件进行测试和研究,得出了目前在10Gbps网络的基础设施下最佳的传输方案参数,文中讨论了影响高速传输的因素,给出了相应的性能优化的策略,在SKA1真正的观测数据产生之前,将为中国SKA区域中心的网络建设和布局提供技术基础。描述的技术细节和方法可供相关科学应用参考和使用。最后讨论并展望了未来SKA网络需求的挑战。

英文摘要:The Square Kilometer Array (SKA) is the largest radio telescope, and the data generated by its observations will be transmitted from Australia and South Africa to the scientific data processing center about one hundred kilometers away at first, and then distributed to various SKA Regional Centres(SRC) with a distance of tens of thousands of kilometers through high-speed network.In the SKA Phase One (SKA1) stage with a scale of 10\% of SKA, it is estimated that about 750PB of data needs to be distributed to each SRC through a network of at least 100Gbps each year. Such high network bandwidth and data scale bring great challenges to data transmission and distribution. This paper analyzes different network protocols such as TCP/UDP/HTTP and uses different software in the field of radio astronomy for testing and research, and then the optimal transmission scheme parameters under the current infrastructure of 10Gbps network are obtained. In this paper, the factors affecting high-speed transmission are discussed, and the corresponding performance optimization strategies are given.Before the real observation data of SKA1 is generated, it will provide the technical foundation for the network construction and layout of China's SKA regional center. The technical details and methods described are available for reference and use in relevant scientific applications. Finally, the challenges of future SKA network requirements are discussed and prospected.

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[V1] 2022-06-28 15:37:24 chinaXiv:202206.00188V1 下载全文
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