squid cache_dir parameters

[Ahmad Saud <pat.trippy@xxxxxxxxx>]

Dears,

We have server for caching with the following specifications:
OS CentOS 6.4 64-bit
Kernel 2.6.32
CPU IntelXeonCPUE5640 2.67GHz 8 Cores
RAM 8GB
hard disk space 850GB
Link Speed 1G


we installed squid-3.1.10-19 and we would like to know the optimal way
to configure the cache_dir size and L1 and L2


Regards