While performing health checks of a Redis 2.8.19 setup running on an 30GB Ubuntu Server 14.04 LTS, I noticed that Linux memory usage was split as follows:
- Used memory : 10GB
- Cached Memory : 10GB
- Free : 10GB
The Redis database is going to grow in the future and I need to forecast next memory upgrade. As a rule of thumb, I trigger an upgrade when 70% of any resource is reached.
My question is: Will Redis performance be impacted when Used memory + Cached memory will reach the 30 GB barrier? (and yes, swap is configured :) )