Advances in storage are becoming increasingly critical because workloads on high performance computing (HPC) and cloud systems are producing and consuming more data than ever before, and the situation promises to only increase in future years. Additionally, the last decades have seen relatively few changes in the structure of parallel file systems, and limited interaction between the evolution of parallel file systems and I/O support systems that take advantage of hierarchical storage layers. However, recently the community has seen a large uptick in innovations in data storage and processing systems as well as in I/O support software. Our goals in the ESSA Workshop are to bring together expert researchers and developers in data-related areas such as storage, I/O, processing and analytics on extreme scale infrastructures including HPC systems, clouds, edge systems or hybrid combinations of these, to discuss advances and possible solutions to the new challenges we face.