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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
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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.
  1. To use disks in a volume group, label them as LVM physical volumes with the pvcreate command.

    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
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  2. 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/sdc1
  Volume group "new_vol_group" successfully created
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    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
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  3. Create the logical volume from the volume group you have created. 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 2 gigabytes of the volume group. 
    # lvcreate -L 2G -n new_logical_volume new_vol_group
  Logical volume "new_logical_volume" created
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  4. 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_volume
This will destroy any data on /dev/new_vol_group/new_logical_volume.

Are you sure you want to proceed? [y/n] y

Device:                    /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
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    The following commands mount the logical volume and report the file system disk space usage. 
    # mount /dev/new_vol_group/new_logical_volume /mnt
# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/new_vol_group/new_logical_volume
                       1965840        20   1965820   1% /mnt
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