    # File lib/fog/voxel/requests/compute/devices_list.rb, line 8
            def devices_list(device_id = nil)
              options = {
                :parser     => Fog::Parsers::Compute::Voxel::DevicesList.new,
                :verbosity  => 'normal'
              }

              unless device_id.nil?
                options[:device_id] = device_id
              end

              request("voxel.devices.list", options)
            end