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Chapter 6. LVM Configuration Examples
This chapter provides some basic LVM configuration examples.
6.1. 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.
6.1.1. 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.
# 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
6.1.2. Creating the Volume Group
The following command creates the volume group
new_vol_group.
# 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.
# vgs
VG #PV #LV #SN Attr VSize VFree
new_vol_group 3 0 0 wz--n- 51.45G 51.45G
6.1.3. 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.
# lvcreate -L2G -n new_logical_volume new_vol_group
Logical volume "new_logical_volume" created
6.1.4. Creating the File System
The following command creates a GFS2 file system on the logical volume.
#mkfs.gfs2 -plock_nolock -j 1 /dev/new_vol_group/new_logical_volumeThis will destroy any data on /dev/new_vol_group/new_logical_volume. Are you sure you want to proceed? [y/n]yDevice: /dev/new_vol_group/new_logical_volume Blocksize: 4096 Filesystem Size: 491460 Journals: 1 Resource Groups: 8 Locking Protocol: lock_nolock Lock Table: Syncing... All Done
The following commands mount the logical volume and report the file system disk space usage.
#mount /dev/new_vol_group/new_logical_volume /mnt[root@tng3-1 ~]#dfFilesystem 1K-blocks Used Available Use% Mounted on /dev/new_vol_group/new_logical_volume 1965840 20 1965820 1% /mnt
