The Cherenkov Telescope Array Observatory (CTAO) is the nextgeneration instrument in the domain of very-high-energy gamma-ray astronomy. It will consist of tens of Cherenkov telescopes deployed across two CTAO array sites at La Palma (Spain) and Paranal (ESO, Chile). Currently under construction, CTAO will begin operations in the coming years for approximately 30 years. During operations, CTAO is expected to generate about 2 PB of raw data annually, in addition to 5-20 PB of Monte Carlo simulation data. Processing such a large volume of data will require hundreds of millions of CPU HS06 hours per year. To meet these high computing and storage requirements, CTAO will rely on resources distributed across four Data Centers. To manage simulation and data processing workflows in such a distributed environment, we have developed a production system prototype based on the DIRAC interware. In this paper, we present the current status of this prototype, the underlying infrastructure, the technologies in use, as well as recent developments regarding user interfaces for workflow description and automatic recovery of incomplete workflows, along with future perspectives.
Pigoux et al. (2025) studied this question.