pvcreate /dev/sdb1
vgcreate test /dev/sdb1
lvcreate -L 1G test
lvcreate -l 20 test

lvextend -L 2G /dev/test/lvol1
vgextend test /dev/sdb2

lvreduce
vgreduce

lvremove
vgremove

vgscan
lvscan
vgchange
lvdisplay
lvs
vgs
vgdisplay
vgexport
vgimport