/dev/mapper/VolGroup-lv_root has no more space left?

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http://serverfault.com – We have a centos machine and the mysql is not starting and is due to space if full. Below is the df-h results. What best can be done in this situation? Add more hard disk ? Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 47G 45G 0 100% / tmpfs 3.9G 0 3.9G 0% /dev/shm /dev/xvda1 485M 33M 428M 7% /boot /dev/mapper/VolGroup-lv_home 44G 180M 42G 1% /home (HowTos)