Availability Zones refer to data centers in the same region with independent power grids and...

If the disaster recovery requirements of your applications are demanding, it is recommended that you deploy ECS instances in the same Region and Zone.

The network latency between inter-Zone ECS instances is lower.

Intranet communication is available between different Zones in the same region, and data center-level fault isolation can be achieved between Zones.

Whether you place ECS instances in the same Zone depends on the requirements for disaster recovery and network latency.

If your applications require low network latency between ECS instances, it is recommended that you create ECS instances in different Zones.