# File lib/fog/ibm/requests/compute/modify_instance.rb, line 39
        def modify_instance(instance_id, params={})
          response = Excon::Response.new
          if instance_exists? instance_id
            if params['state'] == 'restart'
              self.data[:instances][instance_id]["status"] = "8"
              response.status = 200
              response.body   = { "success" => true }
            elsif params['type'] == 'attach' || params['type'] == 'detach'
              if Fog::Storage[:ibm].volume_exists?(params['volume_id'])
                # TODO: Update the instance in the data hash, assuming IBM ever gets this feature working properly.
                response.status = 415
              else
                response.status = 404
              end
            elsif params['name']
              self.data[:instances][instance_id]["name"] = params['name']
              response.status = 200
              response.body = { "success" => true }
            elsif params['expirationTime']
              self.data[:instances][instance_id]["expirationTime"] = params['expirationTime']
              response.status = 200
              response.body = { 'expirationTime' => params['expirationTime'] }
            end
          else
            response.status = 404
          end
          response
        end