KB 461005 - Create LVM in Centos/Rocky Linux.
What is LVM?
LVM is a tool for logical volume management which includes allocating disks, striping, mirroring and resizing logical volumes.
With LVM, a hard drive or set of hard drives is allocated to one or more physical volumes. LVM physical volumes can be placed on other block devices which might span two or more disks.
The physical volumes are combined into logical volumes, with the exception of the /boot partition. The /boot partition cannot be on a logical volume group because the boot loader cannot read it. If the root (/) partition is on a logical volume, create a separate /boot partition which is not a part of a volume group.
How to Create LVM in Centos and Rocky Linux.
Code to create LVM.
- yum install -y makecache lvm2
- lsblk
- pvcreate /dev/sdb /dev/sdc
- vgcreate demo_lvm_group /dev/sdb /dev/sdc
- lvcreate -L 5G -n demo_lvm_volume demo_lvm_group
- mkfs.ext4 /dev/demo_lvm_group/demo_lvm_volume
- mkdir /mnt/lvm
- mount /dev/demo_lvm_group/demo/lvm_volume /mnt/lvm/
- df -h
Code Definition
To install LVM
$yum install -y makecache lvm2
To check available partition
$lsblk
Command to create Physical Volume, here you can define one or more partition name.
$pvcreate /dev/sdb /dev/sdc
Command to create Logical Volume Group, "demo_lvm_group" is a name, shoulb be change.
$vgcreate [demo_lvm_group] /dev/sdb /dev/sdc
Command to create Logical Volume, -L is use for define size, -n is use for Logical Volume name "demo_lvm_volume" (Changable).
$lvcreate -L 5G -n [demo_lvm_volume] [demo_lvm_group]
Command to create file system for newly created Logical Volume.
$mkfs.ext4 /dev/demo_lvm_group/demo_lvm_volume
Create directory and mount Logical Volume
$mkdir /mnt/lvm
$mount /dev/demo_lvm_group/demo/lvm_volume /mnt/lvm/
$df -h
Snapshots
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