12.4.3. Creating an LVM-based Storage Pool with virsh

Procedure 12.3. Creating an LVM-based storage pool with virsh

1. Define the pool name guest_images_lvm.

   # virsh pool-define-as guest_images_lvm logical - - /dev/sdc libvirt_lvm \ /dev/libvirt_lvm
   Pool guest_images_lvm defined
   

2. Build the pool according to the specified name. If you are using an already existing volume group, skip this step.

   # virsh pool-build guest_images_lvm
   
   Pool guest_images_lvm built
   

3. Initialize the new pool.

   # virsh pool-start guest_images_lvm
   
   Pool guest_images_lvm started
   

4. Show the volume group information with the vgs command.

   # vgs
   VG          #PV #LV #SN Attr   VSize   VFree
   libvirt_lvm   1   0   0 wz--n- 465.76g 465.76g
   

5. Set the pool to start automatically.

   # virsh pool-autostart guest_images_lvm
   Pool guest_images_lvm marked as autostarted
   

6. List the available pools with the virsh command.

   # virsh pool-list --all
   Name                 State      Autostart
   -----------------------------------------
   default              active     yes
   guest_images_lvm     active     yes
   

7. The following commands demonstrate the creation of three volumes (volume1, volume2 and volume3) within this pool.

   # virsh vol-create-as guest_images_lvm volume1 8G
   Vol volume1 created
   
   # virsh vol-create-as guest_images_lvm volume2 8G
   Vol volume2 created
   
   # virsh vol-create-as guest_images_lvm volume3 8G
   Vol volume3 created
   

8. List the available volumes in this pool with the virsh command.

   # virsh vol-list guest_images_lvm
   Name                 Path
   -----------------------------------------
   volume1              /dev/libvirt_lvm/volume1
   volume2              /dev/libvirt_lvm/volume2
   volume3              /dev/libvirt_lvm/volume3
   

9. The following two commands (lvscan and lvs) display further information about the newly created volumes.

   # lvscan
   ACTIVE            '/dev/libvirt_lvm/volume1' [8.00 GiB] inherit
   ACTIVE            '/dev/libvirt_lvm/volume2' [8.00 GiB] inherit
   ACTIVE            '/dev/libvirt_lvm/volume3' [8.00 GiB] inherit
   
   # lvs
   LV       VG            Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
   volume1  libvirt_lvm   -wi-a-   8.00g
   volume2  libvirt_lvm   -wi-a-   8.00g
   volume3  libvirt_lvm   -wi-a-   8.00g