Hi Amos, Thank you so much for your guidance. You have no idea how the *key* information you shared here is important to me. As your recommendation I'll do my own calculation based on my own cache ASAP. But before doing my own calculation as you answered *No* to my second question, I just wanted to better understand the rough estimation on that wiki page. I think that I know the difference between the index space size in RAM, the cache_mem size (in RAM) and stored objects size in cache_dir(s) (on Disks). Now if the rough estimation is still valid and it is not based on the default value for store_avg_object_size (13 K), on what (stored on disk) average value is it based? Regarding my question 4, regardless of the squid configuration do, you have an idea about the average size of an object on the Web? Suppose that we don't have a cache at all. The mean object size on my own cache is very close to yours : 101 KB. According to a small ISP the average object size that they can observe is about 850 KB... According to some statistics on some website the average object size on the Web is about 24 KB today. I'm lost... Kind Regards, ----- Bug Reporter Contributor OpenSource = Open-Minded -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/HDD-RAM-Capacity-vs-store-avg-object-size-tp4683072p4683094.html Sent from the Squid - Users mailing list archive at Nabble.com. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users