This topic describes the limits that apply when you use dedicated hosts.

The following table describes the limits that apply when you use dedicated hosts. In addition, the limits on Elastic Compute Service (ECS) resources also apply to ECS instances that are created on dedicated hosts. For more information, see Limits.
Item Description Adjustable
Creation of dedicated hosts

Before you create dedicated hosts in mainland China, you must complete the real-name verification.

N/A
Supported network types Virtual private clouds (VPCs) are supported. For more information, see What is a VPC?. N/A
Billing methods of dedicated hosts and ECS instances

You can create pay-as-you-go or subscription ECS instances on subscription dedicated hosts.

N/A

Creation of subscription ECS instances on a subscription dedicated host

The expiration date of subscription ECS instances cannot be later than that of the dedicated host. N/A

Renewal of subscription ECS instances on a subscription dedicated host

The expiration date of subscription ECS instances cannot be later than that of the dedicated host. If the auto-renewal period of subscription ECS instances do not meet this requirement, the auto-renewal fails. N/A
Switch of the billing method of ECS instances on a dedicated host from pay-as-you-go to subscription

The expiration date of subscription ECS instances cannot be later than that of the dedicated host.

N/A
Change of the billing method of dedicated hosts Not supported. N/A
Migration of ECS instances between a shared host and a dedicated host

Only pay-as-you-go ECS instances can be migrated. Subscription ECS instances and preemptible instances cannot be migrated.

N/A
Migration of ECS instances between different dedicated hosts You can migrate ECS instances only between the same type of dedicated hosts. The dedicated hosts must belong to the same Alibaba Cloud account. ECS instances that run on local SSD hosts cannot be migrated. For more information about dedicated host types, see Dedicated host types. N/A
Automatic instance migration ECS instances that run on local SSD hosts cannot be automatically migrated. N/A
Images used by ECS instances In regions outside mainland China, you cannot use Windows images to create ECS instances on ddh.c6s, ddh.g6s, or ddh.r6s dedicated hosts. N/A
Number of ECS instances
  • A maximum of 150 ECS instances can be created on a single dedicated host of the following types:
    • g6t and c6t
    • g6s, c6s, and r6s
    • g6, c6, and r6
    • i2
  • A maximum of 100 ECS instances can be created on a single dedicated host of the following types:
    • g5, c5, and r5
    • v5
    • g5se and g5ne
N/A