When you use lvm and still have free space on a virtual or physical disk,you can extend your lvm partition to use all free space.
Firstly you should be sure it exists.
Type “vgdisplay” command in root shell.You should see some free space in “Free PE Size”
After that you should type this command “lvextend -l +100%FREE /dev/volgroup/logvol”
After it finishes type resize command according to your file system.
For XFS : xfs_growfs /dev/centos/logvol
For EXT4: resize2fs /dev/centos/logvol
Attention : “logvol” word represents your logical volume.You can see its name in vgdisplay command output.