+++ This bug was initially created as a clone of Bug #985476 +++ Support for bare metal volumes https://blueprints.launchpad.net/cinder/+spec/bare-metal-volumes
As of triage time (today), this BZ's corresponding dev bug (BZ#985476) is still NEW. Until that bug is closed, no doc work can be done.
The engineering bug on which this bug is based is set for a future release. Closing for now - a new bug shall be raised to address this feature in a future release as required.