I'm running into a problem on a really large directory of over a million files (don't ask, my users are clueless). Anyway, I'm trying to to use Ceph as backup storage for their filesystem. As I rsync the directory, it started giving me a "No space left on device" for this directory, even though the ceph filesystem is at 66%, and no individual OSD is fuller than 82%. If I go to the directory and try to do a "touch foo", it gives me the same "No space left on device", but if I go to the parent directory and try to copy a file there, it is fine. So I must be running into some per-directory limit. Any ideas of what I can do to fix this problem? This is Ceph 10.2.5.

Thanks!

Jorge

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