Commands

lvmdiskscan
pvscan
pvs
vgscan
lvs

Create

pvcreate /dev/sdb
vgcreate data-vg  /dev/sdb
lvcreate -l 100%FREE -n data-lv data-vg
mkfs.ext4 /dev/data-vg/data-lv
mkdir /data
echo "/dev/mapper/data--vg-data--lv /data ext4 defaults 0 0" >> /etc/fstab
mount -a
chown nobody:nogroup /data/
chmod og+rw /data

Extend

umount /data
pvcreate /dev/sdcvgextend data-vg /dev/sdclvextend -r /dev/data-vg/data-lv /dev/sdcmount -a