Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
[Services] [Proxy Server] [Cache Mgmt] [Hard disk cache size]
Este es el parámetro que indica el tamaño máximo de la caché.
Lo que pides no es específico de pfSense. Concretamente es de squid:
http://www.squid-cache.org/Doc/config/cache_dir/
