Lvm Configuration Examples; Creating An Lvm Logical Volume On Three Disks; Creating The Physical Volumes; Creating The Volume Group - Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Manual

Chapter 5.

LVM Configuration Examples

This chapter provides some basic LVM configuration examples.

5.1. Creating an LVM Logical Volume on Three Disks

This example creates an LVM logical volume called new_logical_volume that consists of the disks
at /dev/sda1, /dev/sdb1, and /dev/sdc1.

5.1.1. Creating the Physical Volumes

To use disks in a volume group, you label them as LVM physical volumes.
Warning
This command destroys any data on /dev/sda1, /dev/sdb1, and /dev/sdc1.
[root@tng3-1 ~]# pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1
Physical volume "/dev/sda1" successfully created
Physical volume "/dev/sdb1" successfully created
Physical volume "/dev/sdc1" successfully created

5.1.2. Creating the Volume Group

The following command creates the volume group new_vol_group.
[root@tng3-1 ~]# vgcreate new_vol_group /dev/sda1 /dev/sdb1 /dev/sdc1
Volume group "new_vol_group" successfully created
You can use the vgs command to display the attributes of the new volume group.
[root@tng3-1 ~]# vgs
VG #PV #LV #SN Attr
new_vol_group

5.1.3. Creating the Logical Volume

The following command creates the logical volume new_logical_volume from the volume group
new_vol_group. This example creates a logical volume that uses 2GB of the volume group.
[root@tng3-1 ~]# lvcreate -L2G -n new_logical_volume new_vol_group
Logical volume "new_logical_volume" created
3 0 0 wz--n- 51.45G 51.45G
VSize VFree
53