Acabei de aprender com o livro Varnish do software de verniz que a escolha foi suspensa: P74:
5.2 Storage Backends • The storage option -s defines the size of your cache and where it is stored • Use varnishd -s followed by one of the following methods to allocate space for the cache: • malloc • file • persistent (deprecated) • mse Varnish Massive Storage Engine (MSE) in Varnish Plus only