Gracias, entonces lo tenia claro, era como me imaginaba, aprovecho para preguntar al aire, que politica de disco duro y memoria es mas aconsejable para unos 80 usuarios:
Hard disk cache system
This specifies the kind of storage system to use.
ufs is the old well-known Squid storage format that has always been there.
aufs uses POSIX-threads to avoid blocking the main Squid process on disk-I/O. (Formerly known as async-io.)
diskd uses a separate process to avoid blocking the main Squid process on disk-I/O.
null Does not use any storage. Ideal for Embedded/NanoBSD.
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LRU: Last Recently Used Policy - The LRU policies keep recently referenced objects. i.e., it replaces the object that has not been accessed for the longest time.
Heap GDSF: Greedy-Dual Size Frequency - The Heap GDSF policy optimizes object-hit rate by keeping smaller, popular objects in cache. It achieves a lower byte hit rate than LFUDA though, since it evicts larger (possibly popular) objects.
Heap LFUDA: Least Frequently Used with Dynamic Aging - The Heap LFUDA policy keeps popular objects in cache regardless of their size and thus optimizes byte hit rate at the expense of hit rate since one large, popular object will prevent many smaller, slightly less popular objects from being cached.
Heap LRU: Last Recently Used - Works like LRU, but uses a heap instead.
Note: If using the LFUDA replacement policy, the value of Maximum Object Size should be increased above its default of 12KB to maximize the potential byte hit rate improvement of LFUDA.