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GPFS, Lustre, Panasas (PanFS / pNFS), BeeGFS are just about the only games in town for HPC pFSes. OrangeFS maybe.

Also, I wouldn't want their bills for chilled water or electricity. My puny 96-thread EPYC ranges from 300 - 850 W and heats my room. :B

I work on the WekaFS (proprietary) that can definitely handle the relevant workloads and is in use in fairly large installations.

I am not sure about LBNL overall but I would guess computing use is a fraction of what the ALS uses.