Disk Usage Issue

Dear All, Please help me how to delete the old file in /dev/mapper/VolGroup00-LogVol00 root@server [~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 29G 27G 3.9M 100% / /dev/sda6 9.5G 951M 8.1G 11% /tmp /dev/sda5 34G 7.1G 25G 23% /var /dev/sda3 57G 47G 7.0G 87% /usr /dev/sda2 1.7T 830G 742G 53% /home /dev/sda1 487M 30M 432M 7% /boot tmpfs 4.0G 12K 4.0G 1% /dev/shm Thank and Best regards,