# For create logical volume need know volume group and free space

# List of volume groups
 vgs --all

 # In my example I have vg_debian now get information
vgdisplay vg_debian

# Free space is 35GiB in my example (Free  PE / Size       8960 / 35,00 GiB)

# Now I will create logical volume lv_data and ocupate 100% free space
lvcreate -n lv_data -l 100%FREE vg_debian

# Now create file system on logical volume
mkfs.ext4 /dev/mapper/vg_debian-lv_data