Regardless of the article, the issues apply long before you reach exascale, e.g. on typical university-scale systems. PVFS' design compromises on POSIX go back

Regardless of the article, the issues apply long before you reach exascale, e.g. on typical university-scale systems. PVFS' design compromises on POSIX go back quite a long way, and MPI-IO is about 20(?) years old. We've been running non-POSIX-compliant NFS for decades too.