Ncurses is a great tool to help determine which files are using your precious disk space:
You will need to download the latest ncdu package from http://dev.yorhel.nl/ncdu with wget.
Login as root to your machine and under /root download it:
wget http://dev.yorhel.nl/download/ncdu-1.10.tar.gz tar -xzvf ncdu-1.10.tar.g ./configure
If it can’t find ncurses.h and the configure fails,
checking for ncurses.h... no
configure: error: required header file not found
you’ll have to install curses library headers.
yum install ncurses-devel ncurses
then run,
make && make install
Then simply navigate to the directory you want to check