i have installed a centos machine in azure
the hard disk is 120 GB
So right now i have a problem when i checked the df i found only 30 gb and it's full
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 30G 28G 14M 100% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
/dev/sdb1 16G 44M 15G 1% /mnt/resource
how to fix ?