LVM provides a great deal of flexibility. Additional storage capacity can be added to the VG and granted to the LV to provide storage space without interrupting or reconfiguring user resources.
The /dev/mapper/ directory contains all of the logical volumes on the system that are managed by LVM. Devices in this directory are typically formatted as: /dev/mapper/<volume group name>-<logical volume name>
Advantages:
Dynamically create, delete, and resize volumes without having to reboot
Day-to-day management of volumes is easier once everything is set up.
Map multiple logical volumes across multiple physical devices.
A logical volume can exceed the size of any one physical device (as long as it doesn’t exceed the total size of devices in the volume group).
Create virtual snapshots of each logical volume so you can quickly and easily revert a volume to a specific state.
Volume Group (VG)
Maps whole physical devices and partitions (/dev/sda1, /dev/sda2,…) into one or more virtual structure called VG.
Within these, there are one or more LV
Logical Volume (LV)
storage devices that the system, user, and applications work with.
