Concepts
The combination of a region and an availability zone (AZ) identifies the location of a data center. You can create resources in a specific AZ in a region.
- A region is a geographic area where physical data centers are located. Each region is completely independent, improving fault tolerance and stability. After a resource is created, its region cannot be changed.
- An AZ is a physical location using independent power supplies and networks. Faults in an AZ do not affect other AZs. A region can contain multiple AZs, which are physically isolated but interconnected through internal networks. This ensures the independence of AZs and provides low-cost and low-latency network connections.
Figure 1 shows the relationship between regions and AZs.
Selecting a Region
You are advised to select a region close to you or your target users. This reduces network latency and improves access rate.
Selecting an AZ
When determining whether to deploy resources in the same AZ, consider your applications' requirements on disaster recovery (DR) and network latency.
- For high DR capability, deploy resources in different AZs in the same region.
- For low network latency, deploy resources in the same AZ.