LVM add new physical volume to existing logical volume and extend that logical volume as much as possible.

lvm_add_physical_volume.sh

#!/bin/sh

if [ `id -u` -ne '0' ]; then
    echo "This script must be run as root" >&2
    exit 1
fi

drive=$1
volume_group=$2
volume_group_location=$3

pvcreate $drive
vgextend $volume_group $drive

pvdisplay_output=`pvdisplay $drive --units b | grep "PV Size"`
pv_size=`echo $pvdisplay_output | awk '{print $3}'
pv_not_usable=`echo $pvdisplay_output | awk '{print $8}'
extend=`expr $pv_size - $pv_not_usable`

lvextend -L +$extend $volume_group_location
resize2fs $volume_group