Region and AZ

Definitions

A region and an availability zone (AZ) refer to where a data center is. You can create resources in a specific region and AZ.

• Regions are defined based on the geographical location and network latency. Public services, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Object Storage Service (OBS), Virtual Private Cloud (VPC), Elastic IP (EIP), and Image Management Service (IMS), are shared within the same region. Regions are classified into universal regions and dedicated regions. A universal region provides universal cloud services for common tenants. A dedicated region provides services of a specific type or provides services for only specific tenants.
• An AZ contains one or more physical data centers. Each AZ has independent cooling, fire extinguishing, moisture-proofing, and electricity facilities. Within an AZ, compute, network, storage, and other resources are logically divided into multiple clusters. AZs within a region are interconnected using high-speed optical fibers to support cross-AZ HA.

Figure 1 shows the relationship between regions and AZs.

Figure 1 Region and AZ

Huawei Cloud provides services in many regions around the world. You can select a region and an AZ based on your requirements. For more information, see Huawei Cloud Global Regions.

Selecting a Region

Take the following into account when selecting a region:

• Geographical location

  Select a region close to you or your target users. This ensures low access latency.

  • If you provide services in the Chinese mainland, select CN North-Ulanqab1 or CN North-Beijing4.
  • Currently, no regions are available for services outside the Chinese mainland.

Selecting an AZ

When determining whether to deploy resources in the same AZ, consider your application's requirements for DR and network latency.

• Deploy resources in different AZs within the same region to ensure strong DR.
• Deploy resources within the same AZ to ensure low latency.

Regions and Endpoints

You need to specify the region and endpoint before you can call an API to use resources. For details about Huawei Cloud regions and endpoints, see Regions and Endpoints.