To clarify, I am running a forward cache, targeted to reduce egress on my link for ~100 users. Cheers. On Wed, Dec 15, 2010 at 11:17 AM, Sunny <sunyucong@xxxxxxxxx> wrote: > Hi there, > > I am working on building a cache with squid 3.1.9. I've got two > machine with 4G ram and two 500G disk each. I want to make cache as > large as possible to maximize utilization of my two big disk. > > However, I soon found out I am being extremely limited by memory. lots > of swapping starts to happen when my cache exceed 9M objects. Also > everytime I want to restart cache, it would spend a hour just to > rescan all the entities into memory. and it just keep taking longer. > And From iostat -x -d , my two disk utilization is often below 5% > during scan and serving, which is kind of a waste. > > from some doc, I found statement that squid needs 14M (on 64 bit) for > each 1G on disk. If that's the case, to fill 500G disk I would need > ~8G ram just to hold the metadata. > > So my question is: > > 1. Is this statement true? Can squid somehow lookup directly on the > disk to imporve disk utilization and reduce memory needs? > 2. How big the cache people usually have? I think having a 500G cache > will definitely improve hit ratio and byte hit ratio, is that true? > 3. what other optimization is needed for building huge cache? > > Thanks in advance. >
