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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 procedure creates an LVM logical volume called
new_logical_volume that consists of the disks at /dev/sda1, /dev/sdb1, and /dev/sdc1.
- To use disks in a volume group, label them as LVM physical volumes with the
pvcreatecommand.Warning
This command destroys any data on/dev/sda1,/dev/sdb1, and/dev/sdc1.#
pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1Physical volume "/dev/sda1" successfully created Physical volume "/dev/sdb1" successfully created Physical volume "/dev/sdc1" successfully created - Create the a volume group that consists of the LVM physical volumes you have created. The following command creates the volume group
new_vol_group.#
vgcreate new_vol_group /dev/sda1 /dev/sdb1 /dev/sdc1Volume group "new_vol_group" successfully createdYou can use thevgscommand to display the attributes of the new volume group.#
vgsVG #PV #LV #SN Attr VSize VFree new_vol_group 3 0 0 wz--n- 51.45G 51.45G - Create the logical volume from the volume group you have created. The following command creates the logical volume
new_logical_volumefrom the volume groupnew_vol_group. This example creates a logical volume that uses 2 gigabytes of the volume group.#
lvcreate -L 2G -n new_logical_volume new_vol_groupLogical volume "new_logical_volume" created - Create a file system on the logical volume. The following command creates a GFS2 file system on the logical volume.
#
mkfs.gfs2 -p lock_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 DoneThe following commands mount the logical volume and report the file system disk space usage.#
mount /dev/new_vol_group/new_logical_volume /mnt#dfFilesystem 1K-blocks Used Available Use% Mounted on /dev/new_vol_group/new_logical_volume 1965840 20 1965820 1% /mnt
