Strategies of a WLCG Tier-2 site to meet the challenge of ever growing demands on delivery of computing resources

The current era of Exascale computing brings ever growing demands on the amount of available computing performance, storage capacity and network throughput. This aﬀects also the massive computing infrastructure for management of data produced by the experiments at the LHC, the Worldwide LHC Computing Grid (WLCG). The standard ﬁnancing used for many years enabling the resource growth of 10-20 % is no more suﬃcient and to close the resource gap diﬀerent methods are pursued. The sites involved in the WLCG are encouraged to ﬁnd non-grid external resources to be used for WLCG tasks. Probably the most popular among them are High Performance Computing (HPC) Centers. In this contribution, we present an overview of one of the WLCG sites, the distributed Tier-2 center in Prague, Czech Republic. It is a standard example of a WLCG medium size Tier-2 center concerning the hardware resources, site management and the network connections within the WLCG, so a general picture of a WLCG Tier-2 site is provided. In addition, our site complies with the current trends supported by the WLCG. First it is the use of resources of the external national HPC center in Ostrava and second providing resources not only for the LHC experiments but also other particle and astro-particle experiments. This way we follow the recently adopted strategy towards a sustainable and shared infrastructure adapted to the needs of large Exascale science projects. In addition, we make use of BOINC which provides some minor contribution to our resources