cfdisk /dev/sda                        # create new partition, using all free space
pvcreate /dev/sdaX                     # initialize partition for use with LVM
vgdisplay                              # to find VG name
vgextend /dev/vgname /dev/sdaX         # this extends the volume group
lvextend -l +100%FREE /dev/vgname/root # this extends the LVM
resize2fs /dev/vgname/root             # this extends the filesystem