论文标题
彗星I期的数据获取网络
Data taking network for COMET Phase-I
论文作者
论文摘要
在J-PARC构建了一个搜索名为Comet的MU-E转换的实验。实验将使用两阶段I和II期的两阶段方法进行。第1阶段的数据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。它的网络捆绑在具有1-GB光学网络端口的二十个前端设备上。前端计算机通过其网络接受来自设备的数据。另一个是一个后端网络，该网络使用10-GB网络从前端计算机中收集所有事件片段。我们为前端网络使用了低价1GB/10GB光网络开关。后端网络使用10GB光学网络设备之间的前端PC与事件构建PC之间的直接连接用于后端网络。活动构建PC具有10个10 GB网络端口。事件构建PC的每个网络端口都连接到前端PC的端口，而无需使用网络开关。我们通过在这两种网络上的事件构建中评估了数据的性能。前端网络的事件构建吞吐量可实现337 MIB/s。后端网络的事件构建吞吐量达到了1.2 GIB/s。这意味着我们可以使用此结构降低数据接收网络的构建成本而不会恶化性能。此外，我们评估了通过SAS接口连接到后端PC的本地存储RAID磁盘系统的写作速度，以及从实验位置到持久存储的长距离网络副本。
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.
