How can I see what is consuming space underneath a mounted partition?

Solution Unverified - Updated -

Issue

  • My partitions are arranged like this (example):
/ (/dev/sda1)
--/var (/dev/sda2)
--/usr (/dev/sda3)
--/backups (/dev/sda4)
  • My root partition itself (/dev/sda1) is small, and is almost full.
  • There is nothing on any directory that might account for the occuppied space.
  • How can I see where is the consumed space, and free it by deleting files?

Environment

  • Red Hat Enterprise Linux (RHEL) all versions

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