COMET阶段数据采集网络- I
Data taking network for COMET Phase-I
摘要：
J-PARC正在构建一个名为COMET的探索μ-e转换的实验。试验将分两个阶段进行，即第一阶段和第二阶段。一期数据采集系统是基于通用网络技术开发的。数据采集系统由两种网络组成。一个是前端网络。它的网络捆绑了大约20个具有1 Gb光网络端口的前端设备。前端计算机通过其网络接受来自设备的数据。另一个是后端网络，它使用10 Gb网络从前端计算机收集所有事件片段。我们使用了一个低价格的1Gb/10 Gb光网络交换机的前端网络。前端PC和使用10 Gb光网络设备的活动建筑PC之间的直接连接用于后端网络。活动大楼PC有10个10 Gb网络端口。事件构建PC的每个网络端口连接到前端PC的端口，而不使用网络交换机。我们评估了在这两种网络上建立事件的数据采集性能。前端网络的事件生成吞吐量达到337 MiB/s。后端网络的事件构建吞吐量达到1.2 GiB/s。这意味着，我们可以减少建设成本的数据采取网络使用这种结构，而不降低性能。此外，我们还评估了本地存储RAID磁盘系统通过SAS接口连接到后端PC的写入速度，以及从实验位置到持久存储器的远程网络复制。
英文摘要：
An experiment to search for mu-e conversion named COMET is being constructed at J-PARC. The experiment will be carried out using a two-stage approach of Phase-I and Phase-II. The data taking system of Phase-I is developed based on common network technology. The data taking system consists of two kinds of networks. One is a front-end network. Its network bundles around twenty front-end devices that have a 1-Gb optical network port. And a front-end computer accepts data from the devices via its network. The other is a back-end network that collects all event fragments from the front-end computers using a 10-Gb network. We used a low price 1Gb/10Gb optical network switch for the front-end network. And direct connection between the front-end PC and an event building PC using 10-Gb optical network devices was used for the back-end network. The event building PC has ten 10-Gb network ports. And each network port of the event building PC is connected to the front-end PC's port without using a network switch. We evaluated data taking performance with an event building on these two kinds of networks. The event building throughput of the front-end network achieved 337 MiB/s. And the event building throughput of the back-end networks achieved 1.2 GiB/s. It means that we could reduce the construction cost of the data taking network using this structure without deteriorating performance. Moreover, we evaluated the writing speed of the local storage RAID disk system connected to a back-end PC by a SAS interface, and a long-distance network copy from the experiment location to the lasting storage.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
