HPC sites are likely to use https://github.com/cea-hpc/robinhood/wiki/Documentation https://github.com/cea-hpc/robinhood/wiki/Documentation. While its user int

HPC sites are likely to use https://github.com/cea-hpc/robinhood/wiki/Documentation https://github.com/cea-hpc/robinhood/wiki/Documentation. While its user interface isn't SQL, it does store the filesystem metadata in an SQL database (updated from changesets for Lustre filesystems). You don't want to run -- or, specifically, have users run -- ls, find, or du on significant amounts of a typical large filesystem. (As I understand it, you could do something similar to lustre with Isilon/OneFS, for instance.) The metadata store of OrangeFS (PVFS2) is implemented with a database, though a key-value one, and one of the project ideas for it is to search that directly.