After installing OpenShift with a docker storage device set, docker is not using the device

Issue

When installing OpenShift Container Platform 3.x using Advanced Installation (ansible playbooks), this setting was used in the inventory file:

container_runtime_docker_storage_setup_device=/dev/sdc
container_runtime_docker_storage_type=xfs

But after the installation, docker isn't using the device:

# docker info
[...]
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: false
 Native Overlay Diff: true
[...]

# lvs
[...] missing docker-pool volume [...]