Abstract
Belle II has started the Phase 3 data taking with a fully equipped detector. The data flow at the maximum luminosity is expected to be 12PB of data/year and will be analysed by a cutting-edge computing infrastructure spread over 26 Countries. Several of the major computing centres for HEP in Europe, USA and Canada will store the second copy of RAW data. In this scenario, the international network infrastructure for research plays a key role in supporting and orchestrating all the activities of data analysis and replication. The large-scale network data challenge will also take advantage from LHCONE VRF service and the support of network experts of KEKCC, Belle II sites and NREN. The program of major upgrade in 2019 empowered the connection among Japan, Europe and USA over a 100Gb geographic ring. In this work, we summarize the network requirements needed to accomplish all the tasks provided by the Belle II computing model. We also highlight the status of the major network links that support and advance Belle II. Lastly, we present the results of the last Network Data Challenge campaign performed between KEK and the main RAW data centres with the additional usage of the Data Transfer Node service provided by GÉANT.
Highlights
Belle II collaboration [1] involves 26 countries/regions, around 120 institutions and more than 1000 people distributed all over the world
According to the current estimation [2], Belle II will collect more than 12PB of RAW data per year at the maximum luminosity, and the data will be processed over a distributed computing infrastructure
One full copy of the collected RAW data will be stored in Japan at the main site Kō Enerugī Kasokuki Kenkyū Kikō (KEK) [3] hosting the Tier-0 in the KEK Computing Centre (KEKCC), while a second copy will be distributed to five countries with shares of which 30% to USA, 20% to Italy, 20% to Germany, 15% to France and 15% to Canada
Summary
Belle II collaboration [1] involves 26 countries/regions, around 120 institutions and more than 1000 people distributed all over the world. According to the current estimation [2], Belle II will collect more than 12PB of RAW data per year at the maximum luminosity, and the data will be processed over a distributed computing infrastructure. One full copy of the collected RAW data will be stored in Japan at the main site Kō Enerugī Kasokuki Kenkyū Kikō (KEK) [3] hosting the Tier-0 in the KEK Computing Centre (KEKCC), while a second copy will be distributed to five countries with shares of which 30% to USA, 20% to Italy, 20% to Germany, 15% to France and 15% to Canada. In addition to the RAW data management, the Belle II Computing Model provides several activities that will produce traffic among all sites of the collaboration which compose the distributed infrastructure: i.e. skimming, analysis and MC production.
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