http://dacxzjk3kq5mmepbdd3ai2ifynlzxsnpl2cnkfhridqfywihrfftapid.onion/help/administration/redis/replication_and_failover.md
For a recommended setup that can resist more failures, you need to install
the Linux package in 5 independent machines, both with
Redis and Sentinel :
Redis Primary + Sentinel
Redis Replica + Sentinel
Redis Replica + Sentinel
Redis Replica + Sentinel
Redis Replica + Sentinel
Redis setup overview
You must have at least 3 Redis servers: 1 primary, 2 Replicas, and they
need to each be on independent machines.