If you need to check Usage, but you wish to avoid the mount-point, you can use the command
[root@hpc-hn /]# du -h -x -d 1 48M ./etc 552M ./root 11G ./var 1.1G ./tmp 11G ./usr 0 ./media 0 ./mnt 4.8G ./opt 0 ./srv 0 ./install 0 ./log 0 ./misc 0 ./net 0 ./server_priv 0 ./ProjectSpace 0 ./media1 0 ./media2 28G .
- -h refers to human-readable
- -d refers to depth level. By default, it is 0 which is the same as summarize
- -x skip directories on different file systems