    # File lib/fog/rackspace/requests/block_storage/create_volume.rb, line 5
            def create_volume(size, options = {})
              data = {
                'volume' => {
                  'size' => size
                }
              }

              data['volume']['display_name'] = options[:display_name] unless options[:display_name].nil?
              data['volume']['display_description'] = options[:display_description] unless options[:display_description].nil?
              data['volume']['volume_type'] = options[:volume_type] unless options[:volume_type].nil?
              data['volume']['availability_zone'] = options[:availability_zone] unless options[:availability_zone].nil?

              request(
                :body => Fog::JSON.encode(data),
                :expects => [200],
                :method => 'POST',
                :path => "volumes"
              )
            end