❑ Physical volume : A physical disk like HDD, SSD(Including partition).
* PE(Physical Extent) : The basic unit that constitutes PV(Physical volume).
❑ Volume group : A collection of physical volumes.
❑ Logical volume : A divided volume group.
* LE(Logical Extent) : The basic unit that constitutes LV(Logical volume).
* Basically PE and LE match 1:1.