"Linux Basics" 15, LVM

I. Overview of LVM

1. Introduction to LVM

lvm:logical Volume Manager is a logical volume manager provided by the kernel that allows the user to dynamically resize the file system . LVM provides a logical storage device that users no longer care about the underlying physical hard disk.

A layer of abstraction that allows for easy operation of the volume, including resizing the file system

Allows the file system to be re-organized between multiple physical devices:

1) to designate a device as a physical volume

2) Create a volume group with one or more physical volumes

3) Physical volumes are defined by a fixed-size physical area (physical extent,pe)

4) Logical volumes created on physical volumes are made up of physical regions (PE)

5) You can create a file system on a logical volume

Lvm:logical Volume Manager,version 2

Dm:device Mapper, a module that organizes one or more underlying block devices into a logical device

Device Name:/dev/dm-#

Combine multiple pieces of equipment into one to use

Linux Basics 15, LVM