How Should I Select AZs When Creating a DCS Memcached Instance?

Different AZs within a region do not differ in functions.

Generally, instance deployment within an AZ features lower network latency while cross-AZ deployment ensures disaster recovery. If your application requires lower network latency, choose single-AZ deployment.

DCS for Memcached supports cross-AZ deployment. When creating a DCS Memcached instance on the DCS console, you can select any AZ in the same region as your ECS for communication between your ECS and instance. For lower network latency, select the same AZ as your ECS.

Assume that you have an ECS that is in AZ B in the CN-Hong Kong region. When creating a DCS Memcached instance, you can select any AZ in CN-Hong Kong. If you select AZ B in CN-Hong Kong, your instance can communicate with your ECS with lower network latency.

Note that there may be only one available AZ due to insufficient resources when you create a DCS Memcached instance. This does not affect the normal use of DCS.