Dear With this configuration i have a lot of TCP_MISS:HIER_DIRECT I understand that TCP_MISS means that the object is not stored on cache What's means HIER_DIRECT ? Second, why the proxy did not cache anything ? cache_dir diskd /var/squid/cache_booster 500 16 256 max-size=322560 #--------- Multiple cpus -- (enabled) workers 4 if ${process_number} = 1 cache_dir aufs /var/cache/squid2-1 5000 128 512 min-size=322560 endif if ${process_number} = 2 cache_dir aufs /var/cache/squid2-2 5000 128 512 min-size=322560 endif if ${process_number} = 3 cache_dir aufs /var/cache/squid2-3 5000 128 512 min-size=322560 endif if ${process_number} = 4 cache_dir aufs /var/cache/squid2-4 5000 128 512 min-size=322560 endif #------------------