It would be interesting to know how well Spectrum Scale large directory and small file features work in these sort of DB-ish applications.
You might want to optimize by creating a file system provisioned and tuned for such application... Regardless of file system, `ls -1 | grep ...` in a huge directory is not going to be a good idea. But stats and/or opens on a huge directory to look for a particular file should work pretty well...
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