Remember, while sharding allows for horizontal scaling and improves overall performance, it does increase complexity as data consistency becomes more challenging to manage.
Replication: Redis offers data replication to enhance read performance. It allows you to create copies of your master node's data onto one or multiple slave nodes. Read operations can then be divided among these nodes, reducing the load on the master node.
# In the slave node configuration file, add:slaveof <masterip><masterport>
However, replication is not designed to provide additional write scalability. Writes still have to go to the master node, and the slaves synchronize data from the master.
Please remember that each scaling method comes with its own trade-offs, so you should choose what suits your needs best.