I'm using nginx as a reverse proxy, but trying to figure out how large I should set the 'keys_zone' attribute on the 'proxy_cache_path' directive. The only advice on determining that size that I have found is http://www.ruby-forum.com/topic/2053000
However this does not sound right to me as 'max_size / (average file size)' seems like way overkill.
Isn't keys_zone just the metadata for the cached file on disk? therefore, the size of a given entry should be really small. Is there any way to do a 'get' on an entry in the zone so I can see how much space a given entry is taking up?