Basic concepts of Linux LVM

Logical Volume Mananger
The system kernel called by this tool is Dm:device Mapper, which organizes one or more underlying block devices into a logical device module.

LVM is like a dough, the underlying disk makes up a huge dough, and then divides the dough into several partitions for use. This allows the size of the partition to expand and contract flexibly.
Basic concepts
The PV physical volume can be either a partition or a whole disk
PE:PV is divided into the same size data block, this data block is called the PE (phsical Extent), only after adding PV to the VG, it will be divided into PE
VG: Can contain more than one PV. VG cannot be directly formatted. This is the big dough.
LV: Logical volume. This is the little dough. Composed of Le, LV can be used as partition or disk directly formatted, LE and PE have a correspondence, is a le corresponding to several PE. Default is 1:1

Basic concepts of Linux LVM