BEXCO - Room F(201/202/203/204)
[GA137] The ASTRI Archive System: testbed for the Cherenkov Telescope Array
- L. Angelo ANTONELLI
- Stefano GALLOZZI (INAF-Osservatorio Astronomico di Roma)
In the framework of the Cherenkov Telescope Array (CTA) observatory, the Italian National Institute for Astrophysics (INAF) is developing an end-to-end prototype proposed for the CTA small-size class of telescopes in dual-mirror (SST-2M) configuration. The prototype, named ASTRI SST-2M, is currently undergoing the scientific and performance validation phase. In a second phase of the project, a mini-array of nine ASTRI telescopes will be deployed at the southern CTA site, with a collaborative effort of institutes from Italy, Brazil and South-Africa. The off-site data archiving and handling management system for both the ASTRI SST-2M prototype and mini-array are developed within INAF institutes and take care of the full data-chain produced by the different scientific devices at different analysis steps. The archive system provides the data access at different user-levels and for different use-cases, each one with a customized data organization. A dedicated framework to access, browse and download produced data has been developed within a scientific gateway utility. A customized proposal handling/scheduler system and user access utility for the ASTRI SST-2M prototype have been included too. The end-to-end experience in the ASTRI SST-2M prototype and the knowledge discovery solutions for the databases and the "big data" issues involved in the CTA horizon favours a distributed system as the practical archive organization. The mini-array project archive will be used as a technological pre-production testbed to be adopted in the final CTA production. A first demonstrator was developed within the European H2020-Indigo Data Cloud project using the latest IT solutions for developing a distributed system deployed as a federation of different storage entities (i.e. three storage nodes). These storage entities are included in the data-grid topology infrastructure in order to inherit the CTA simulation computing model and be ready to evolve in the "storage as a service" cloud paradigm. Scientific CTA end-users can adopt CTA authentication and authorization services granting permissions to carry out tasks in the federated archive, while simulation and pipeline users may connect to the archive system using standard grid authentication mechanisms. Such a structured testbed may become a de-facto standard for multi-purpose adaptive storage applications ready for several heterogeneous scientific communities.