# File lib/rhc/commands/cartridge.rb, line 222
    def scale(cartridge, multiplier)
      options.default(:min => Integer(multiplier), :max => Integer(multiplier)) if multiplier rescue raise ArgumentError, "Multiplier must be a positive integer."

      raise RHC::MissingScalingValueException unless options.min || options.max

      rest_app = find_app(:include => :cartridges)
      rest_cartridge = check_cartridges(cartridge, :from => rest_app.cartridges).first

      raise RHC::CartridgeNotScalableException unless rest_cartridge.scalable?

      warn "This operation will run until the application is at the minimum scale and may take several minutes."
      say "Setting scale range for #{rest_cartridge.name} ... "

      cart = rest_cartridge.set_scales({
        :scales_from => options.min,
        :scales_to   => options.max
      })

      success "done"
      paragraph{ display_cart(cart) }

      0
    rescue RHC::Rest::TimeoutException => e
      raise unless e.on_receive?
      info "The server has closed the connection, but your scaling operation is still in progress.  Please check the status of your operation via 'rhc show-app'."
      1
    end