CC-NIE Integration: Leveraging DYNES for Weather Data Distribution on Multicast Virtual Circuits

该项目的目标是创建一个名为“本地数据管理器”（LDM）的软件程序的新版本，该软件由大学大气研究公司（UCAR）用于向170多个机构分发天气数据。这个新版本使用网络组播服务，以减少所需的计算资源和网络容量。所采用的方法如下：(i)通过将称为虚拟电路多播传输协议（VCMTP）的可靠多播传输协议集成到当前的LDM-6中，实现LDM-7的新版本；（ii）将LDM-7安装在动态网络系统（DYNES）主机上，这些主机已作为另一项NSF拨款的一部分部署在几所大学中；（iii）比较LDM-7在两种类型的网络多播服务中的性能。第3层（IP）多播和第2层多播虚拟电路，以及（iv）在威斯康星大学和罗格斯大学进行LDM-7的beta测试，以便将来过渡到其他170所大学进行实践。该项目的潜在好处是有希望的，因为LDM-6有一个庞大的部署基地；除了UCAR，它还被美国国家海洋和大气管理局、美国国家航空航天局、美国地质调查局、美国陆军工程兵团、美国空军、美国海军和国际机构使用。基于对VCMTP的初步评估，我们的预期结果是LDM-7将需要更少的服务器和更低的网络容量来实现与今天的LDM-6相同的性能水平。更广泛地说，这种具有可靠传输协议的网络多播解决方案可用于传播其他类型的信息，如金融数据和视频文件。

The project objective is to create a new version of a software program called Local Data Manager (LDM), which is used to distribute weather data by the University Corporation for Atmospheric Research (UCAR) to over 170 institutions. This new version uses network multicast services in order to decrease the required computing resources and network capacity. The methods being employed are as follows: (i) implement a new version of LDM, LDM-7, by integrating a reliable multicast transport protocol called Virtual Circuit Multicast Transport Protocol (VCMTP) into the current LDM-6, (ii) install LDM-7 on Dynamic Network System (DYNES) hosts that have been deployed at several universities as part of another NSF grant, (iii) compare performance of LDM-7 across two types of network multicast service: layer-3 (IP) multicast and layer-2 multicast virtual circuits, and (iv) beta test LDM-7 at U. Wisconsin and Rutgers U. for future transition to practice at the other 170 institutions. The potential benefits of the project are promising because LDM-6 has a large deployed base; in addition to UCAR, it is used by NOAA, NASA, US Geological Survey, US Army Corps of Engineers, US Air Force, US Navy, and international agencies. Our expected outcome, based on a preliminary evaluation of VCMTP, is that LDM-7 will require fewer servers and lower network capacity to achieve the same level of performance as today's LDM-6. More broadly, this network multicast solution with the reliable transport protocol can be used to disseminate other types of information such as financial data and video files.