How to find hidden disk space using bind mounts?

Solution Verified - Updated -

Issue

  • How to find exact space utilization of the file-system?
  • Difference in df and du o/ps for the filesystem.
  • File-system getting full without data utilization.
# df -h /
Filesystem          Size  Used Avail Use%  Mounted on
/dev/mapper/vg-lv   6G    6G   0     100%  /xyz

# du -sch /
3G  /xyz
3G  total

Environment

Red Hat Enterprise Linux (All versions)

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