This page gives an overview of single-zone instances for Memorystore for Valkey.
For instructions on provisioning a single-zone instance see Create a single-zone instance.
By default, Memorystore for Valkey distributes an instance's nodes evenly among available zones. For diagrams that show how nodes are distributed with this setup, see High availability and replicas.
Alternatively, you can choose to create a single-zone instance. Single-zone instances have lower latency than multi-zone instances because you can place your clients in the same zone as the Valkey nodes and avoid cross-zone communication.
You choose the zone distribution mode (single-zone or multi-zone) during instance creation. After it's created, the zone distribution mode can't be changed.
If you connect to a single-zone instance from a client in the same zone, then you aren't charged for Consumer Data Processing. For more information, see Network pricing.
Although we recommend provisioning a multi-zone instance with High Availability, you should use the following recommendations for single-zone instances if they apply to you:
If you choose to provision a single-zone instance, you should enable replicas. Replicas reduce shard hotspots and make shards more resilient against single-node failures.
If you choose to provision an instance without replicas, you should still use a single-zone instance. For more information, see Choose a single-zone instance if your instance doesn't use replicas.
Single-zone instance diagram example
