The real-time subterranean system demands high operational efficiency. It is connected to the experiment observation system through a dedicated interface, and performs data collection and format conversion. Importantlym the system is constructed so that experimental observation data is not lost, even if communication with the outside system data servers is lost. This provides a no loss collection capability for data from events that cannot be observed a second time.
The system consists of Fujitsu PRIMERGY servers and ETERNUS storage systems.
The outside system accumulates and analyzes observation data sent from the subterranean system (approx. 700 GB per day). This is stored on the data servers once the software, running on the data analysis units, removes events that are clearly unneeded (approx. 150 GB per day).
Detailed event reconstruction software is used on the accumulated data, on the data servers, to select and reconstruct neutrino events. Physical analysis is used on the events selected, to gain more in-depth understanding of the properties of neutrinos. This requires high CPU processing capacity and high speed data access.
The system is capable of executing a maximum of 1080 jobs simultaneously, to provide high-speed parametric analysis processing. To assist this, throughput capacity of 960 MB per second (average value for reads and writes) is achieved through the disk unit and file system design.
This system consists of PRIMEQUEST mission critical IA servers, PRIMERGY servers, and ETERNUS storage systems.
This is the world's largest water Cherenkov cosmic elementary particle detector. This not only measures neutrinos from supernova explosions, but also observes atmospheric neutrinos, solar neutrinos, and man-made neutrinos emitted from Tokai village in Ibaraki prefecture (T2K experiment).
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