CDN Cache Ratio

This post is about the Cache ration and explains how CDN can cache your content.
One of the most common metrics for evaluating CDN performance is cache hit ratio (CHR). CDN customers have used it for years as a primary indicator of how well a CDN is serving their users and handling their traffic. It’s not uncommon to see “98% cache hit ratio” in a dashboard and become easily convinced that end users are getting the most out of the CDN.

But there’s much more to CHR than meets the eye and the metric we often hold so dear may not be telling us what we think it’s telling us. So, I thought it’d be a good idea to dig into what CHR is actually measuring and how we may need new ways of calculating and evaluating it.

You can read a very interesting article from VP of Technology at Fastly here: