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In 2016, CERN decided to phase out the legacy OpenAFS storage service due to concerns for the upstream project’s longevity, and the potential impact of disorderly service stop on CERN’s computing services. Early 2019, the OpenAFS risks of the project collapsing have been reassessed and several early concerns have been allayed. In this paper we recap the work done so far, highlight some of the issues encountered, and present current state and planning.

Cloud Services for Synchronization and Sharing (CS3) [14] have become increasing popular in the European Education and Research landscape in the last years. Services such as CERNBox, SWITCHdrive, SURFdrive, PSNCBox, Sciebo, CloudStor and many more have become indispensable in everyday work for scientists, engineers, educators and other users in public research and education sector. CS3 services are currently too fragmented and lack interoperability. To fix this problem and interconnect storage-, applicationand research services a set of interoperable interfaces, CS3APIs [10], has been developed. CS3APIs enable creation of easily-accessible and integrated science environments, facilitating cross-institutional research activities and avoiding fragmented silos based on ad-hoc solutions. In this paper we introduce the CS3APIs and its reference implementation, Reva [16].