if you run Redis you need at least 25% of extra RAM on top the instance memorysize if you want to avoid a lot of nasty OOM scenarios. Memorystore gives this mem

if you run Redis you need at least 25% of extra RAM on top the instance memorysize if you want to avoid a lot of nasty OOM scenarios. Memorystore gives this memory by default and in aws you need to tweak the reserved-memory. https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/redis-memory-management.html https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/...