Deep diving into Logical Volume Manager

Despite basic differences between Btrfs and LVM, they have a lot in common:

• They focus on protecting against filesystem corruption
• They support single - or multiple-device setup
• They can create quick snapshots
• Several tools exist to help manage them in graphic or command - line form

LVM sits on a layer before the filesystem, so it supports any filesystem. LVM converts any device or partition into a physical device (pv) that is dynamically manageable. Physical devices get placed in volume groups (vg), enabling the creation of logical volumes (lv).

This is how an LVM structure gets created sequentially:

1. It creates physical devices with the available devices, using the pvcreate [device1] [device2] ... command.
2. It joins the physical devices, creating the volume group, using the vgcreate [vg_name] [pv1] [pv2] ... command.
3. It creates the logical volume with the lvcreate command.

To remove each layer...