[BLUG] How to utilize these unused spaces?

Hi,

I have a lvm2 system that's currently not utilizing all available disk space as shown in the following pvs output:

# pvs
  PV         VG      Fmt  Attr PSize   PFree  
  /dev/sdb1  pool_vg lvm2 a-   931.51g 118.26g
  /dev/sdc1  pool_vg lvm2 a-   931.51g      0
  /dev/sdd1  pool_vg lvm2 a-   931.51g 528.00m
  /dev/sde1  pool_vg lvm2 a-   931.51g 150.26g
  /dev/sdf1  pool_vg lvm2 a-   931.51g 150.26g

Is it possible to incorporate the free spaces into the existing logical volume?

Thanks,
Shing-Shong