Dear I would like to create a kind of law calculation in order to quickly calculate server performances to store squid... I know there is a lot of parameters that should make e this calculation more complex, but this is just to be generic. For example : I have 150 users : ----------------------------------- Memory : 750K per users = 150x750=112 Mb memory + 300Mb for the system = 512 Mb minimal. Hard disk cache : 50Mb/user = 150*50 = 7.5Go minimal stored disk size for cache.. Is it make sense ?