Comment by leansensei

The post explains why I don't want to use disksup. You have to start an extra application (os_mon) and configure disksup to update the starts more frequently than the default of every 30 minutes.

Do we really need to do all that instead of the equivalent of a df?

Agree about the C code, which is why the latest version (on GitHub, the HEAD, not yet released in Hex.pm) is now using Rust and Rustler.