> I'd like to add to this. How do you go about measuring requests/sec?

Use cachemgr for getting this info (cache utilization).

> Manually, with the access.log timestamps, or is there a squid=20
> utility to do
> this? What's the typical upper limit for ufs, aufs, etc?

Will depend on disk/bus hw. performance.

Somewhat illustrative :


> ....