# File lib/deltacloud/drivers/gogrid/gogrid_driver.rb, line 124
  def list_instances(credentials, id)
    instances = []
    safely do
      new_client(credentials).request('grid/server/list')['list'].collect do |instance|
        if id.nil? or instance['name'] == id
          instances << convert_instance(instance, credentials.user)
        end
      end
    end
    instances
  end