Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Choosing Regions and Availability Zones

Amazon Cloud computing resources are housed in highly available data center facilities. To provide additional scalability and reliability, these data center facilities are located in different physical locations. These locations are categorized by regions and Availability Zones.

Amazon Regions are large and widely dispersed into separate geographic locations. Availability Zones are distinct locations within an Amazon Region that are engineered to be isolated from failures in other Availability Zones. They provide inexpensive, low-latency network connectivity to other Availability Zones in the same Amazon Region.

To create or work with a cluster in a specific region, use the corresponding regional service endpoint. For service endpoints, see Supported Regions & endpoints.

Locating your nodes

Any cluster that has at least one replica must be spread across AZs. The only way you can locate everything within a single AZ is with a cluster comprised of single-node shards.

By locating the nodes in different AZs, MemoryDB eliminates the chance that a failure, such as a power outage, in one AZ will cause loss of availability.

Supported Regions & endpoints

MemoryDB for Redis is available in multiple Amazon Regions. This means that you can launch MemoryDB clusters in locations that meet your requirements. For example, you can launch in the Amazon Region closest to your customers, or launch in a particular Amazon Region to meet certain legal requirements. In addition, as MemoryDB expands availability to a new Amazon Region, MemoryDB supports the two most recent MAJOR.MINOR versions at that time for the new Region. For more information on MemoryDB versions, see Redis engine versions.

By default, the Amazon SDKs, Amazon CLI, MemoryDB API, and MemoryDB console reference the US-East (N. Virginia) Region. As MemoryDB expands availability to new regions, new endpoints for these regions are also available to use in your HTTP requests, the Amazon SDKs, Amazon CLI, and the console.

Each Region is designed to be completely isolated from the other Regions. Within each region are multiple Availability Zones (AZ). By launching your nodes in different AZs you achieve the greatest possible fault tolerance. For more information on regions and Availability Zones, see Choosing Regions and Availability Zones at the beginning of this topic.

For a table of Amazon products and services by region, see Products and services by Region.

For a table of supported Availability Zones within Regions, see Subnets and subnet groups.