High pagehit [50M+/month] Installation Redis Cache Bottleneck

@fkaufmann wrote:

Hi everybody,

we run a load balanced Matomo Installation with more than 50M Page hits per Month.

We have set up a separate Redis Server Instance for Tracking Request Queing as well as a Cache Backend as described in How to configure Redis as a shared cache in a load balanced environment? - Analytics Platform - Matomo

Just recently we noticed that the Network Link of the Redis Instance can become utilized with more than 100 MB/s outgoing data and ~ 2 MB Incoming data. The Redis Instance becomes a Bottleneck in the System.
If we move from a shared Redis Cache to a File based Cache Backend the Link saturation immediately dropps significantly

Is this normal that it needs to cache this much data and are there any suggestion to improve this setup ?
What are the Drawbacks to using file caches on every loadbalanced tracking request server against the recommendations of the faq ?
Would it help to chain in the file cache (array -> file -> redis-server) in the chained setup ?

Thank you very much in advance for any tipps.

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