Disk full, du tells different. How to further investigate?

Check for files on located under mount points. Frequently if you mount a directory (say a sambafs) onto a filesystem that already had a file or directories under it, you lose the ability to see those files, but they’re still consuming space on the underlying disk. I’ve had file copies while in single user mode dump files into directories that I couldn’t see except in single usermode (due to other directory systems being mounted on top of them).

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