Docs

Elastic Compute Service

FAQ

Instance FAQ

How do instances created on a DDH differ from regular ECS instances?

ECS instances on a DDH and those on a shared host differ in the following ways:

Performance is generally consistent. A DDH provides a single-tenant environment, offering better performance and stability due to dedicated access to physical resources.

For differences in features, refer to Feature comparison of instances on hosts.

Are the instance types that can be deployed on a DDH the same as those on a shared host?

No. For the list of instance types you can create on a DDH, see DDH specification overview.

Is there a limit to the number of instances I can create on a DDH?

Yes. The number of instances you can deploy on a DDH is determined by DDH's total resource capacity and the types of instances you need to deploy. For example, a DDH with a total capacity of 448 vCPUs has four 16-vCPU instances deployed on it. The used vCPU capacity is 64, leaving 384 vCPUs available for additional instances.

For the specific number of instances of the same type that can be created on one DDH, see ECS instance types supported by DDHs.

Can I create instances of different types on the same DDH?

Yes. Within the DDH capacity, you can create any ECS instance type that is compatible with the DDH specifications. For example, on an r2s DDH, you can create any instance type belonging to the r2s instance family, but not types from other families. For details on DDH types and the types of instances that can be created on them, refer to DDH specification overview.

Can I upgrade or downgrade the configuration for instances on a DDH?

Yes. For more information, see Changing instance type.

Can I specify a particular DDH to create an instance on?

Yes. For specific steps, see Creating ECS instance on DDH.

Can I migrate an ECS instance between DDHs?

Yes. You can migrate an ECS instance from one DDH to another. For specific steps, see Migrating instances between DDHs.

Can I migrate an ECS instance between a DDH and a shared host?

Yes. You can migrate ECS instances between a DDH and a shared host. For specific steps, see:

Migrating ECS instances from DDHs to shared hosts

Migrating ECS instances from shared hosts to DDHs

Last updated: 2026.01.16 19:04:49