8.4.2. Configuring for LVM Storage Backend

The volume service is able to make use of a volume group attached directly to the server on which the service runs. This volume group must be created exclusively for use by the block storage service and the configuration updated to point to the name of the volume group.

The following steps must be performed while logged into the system hosting the volume service as the root user:

Use the pvcreate command to create a physical volume.
```
# pvcreate DEVICE
  Physical volume "DEVICE" successfully created
```
Replace DEVICE with the path to a valid, unused, device. For example:
```
# pvcreate /dev/sdX
```
Use the vgcreate command to create a volume group.
```
# vgcreate cinder-volumes DEVICE
  Volume group "cinder-volumes" successfully created
```
Replace DEVICE with the path to the device used when creating the physical volume. Optionally replace cinder-volumes with an alternative name for the new volume group.
Set the volume_group configuration key to the name of the newly created volume group.
```
# openstack-config --set /etc/cinder/cinder.conf \
DEFAULT volume_group cinder-volumes
```
The name provided must match the name of the volume group created in the previous step.
Ensure that the correct volume driver for accessing LVM storage is in use by setting the volume_driver configuration key to cinder.volume.drivers.lvm.LVMISCSIDriver.
```
# openstack-config --set /etc/cinder/cinder.conf \
DEFAULT volume_driver cinder.volume.drivers.lvm.LVMISCSIDriver
```

The volume service has been configured to use LVM storage.

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