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Chapter 5. LVM Configuration Examples

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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.
  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
    
  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
    
    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
    
  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
    
  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
    
    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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