The ATLAS Data Carousel Project

The High Luminosity upgrade to the LHC, which aims for a ten-foldincrease in the luminosity of proton-proton collisions at an energy of 14 TeV,is expected to start operation in 2028/29, and will deliver an unprecedentedvolume of scientific data at the multi-exabyte scale. This amount of data hasto be stored and the corresponding storage system must ensure fast and reli-able data delivery for processing by scientific groups distributed all over theworld. The present LHC computing and data management model will not beable to provide the required infrastructure growth even taking into account theexpected hardware technology evolution. To address this challenge, the DataCarousel R&D project was launched by the ATLAS experiment in the fall of2018. State-of-the-art data and workflow management technologies are underactive development, and their current status is presented here.