Dedicated Host:Create a dedicated host

Procedure

1. Log on to the ECS console.

2. In the left-side navigation pane, choose Instances & Images > Dedicated Hosts.

3. In the upper-left corner of the top navigation bar, select a region.

4. On the Dedicated Hosts page, click Create DDH.

5. On the page that appears, configure the following parameters.

   Parameter	Description	Example
   Billing Method	You can choose between Subscription and Pay-as-you-go. For more information about billing, see Overview.	Subscription
   Region	The region in which you want to create a dedicated host. For more information, see Regions and zones.	China (Beijing)
   Dedicated Host Type	The dedicated host type determines the instance family and the maximum number of ECS instances that you can deploy on the dedicated host. You can customize the vCPU-to-memory ratio for the ECS instances deployed on the following host types: g6s, c6s, and r6s. For more information, see Dedicated host types. Important ECS instances on local SSD type i2 dedicated hosts do not support self-service migration or automatic failover. If a local SSD type i2 fails, you can submit a ticket to migrate your instances. However, the data on local SSDs will be lost after the migration.	Local SSD Type i2
   DDH Name	The name of the dedicated host. The name must be 2 to 128 characters in length, and can contain letters, digits, periods (.), underscores (_), colons (:), and hyphens (-). It must start with a letter.	DDH-test
   Quantity	The number of dedicated hosts that you want to purchase.	1
   Tag	Each tag consists of a case-sensitive key-value pair. You can attach tags to dedicated hosts and manage dedicated hosts in groups. For more information, see Overview.	We recommend that you keep the default setting.
   Resource Group	Resource groups are a convenient way to manage your resources based on usage, permissions, and regions. You can group resources that have specific functions together and manage them according to roles and projects. You can add dedicated hosts to resource groups. For more information, see Resource groups.	We recommend that you keep the default setting.
   DDH Settings	Some features in this section may not be available to all dedicated host types. To view the features supported by your host, go to the DDH console. Allow Automatic Deployment: If you select Allow Automatic Deployment, ECS instances are automatically deployed on dedicated hosts that have available resources. For more information, see Features. If you do not select Allow Automatic Deployment, you must specify a dedicated host when you create ECS instances. By default, Allow Automatic Deployment is selected. Automatic Instance Migration upon DDH Failure If you select Automatic Instance Migration upon DDH Failure, the ECS instances on the dedicated host are automatically migrated to a healthy dedicated host if the original dedicated host fails or becomes unhealthy. If you do not select this option, you must submit a ticket to apply for a new dedicated host if the original dedicated host fails. By default, the Automatic Instance Migration upon DDH Failure option is selected. You can change this setting after the dedicated host is created. For more information, see Configure auto failover. Important This feature is unavailable for local SSD type i2. CPU Overprovisioning Ratio: You can configure the CPU overprovisioning ratio only for the overprovisioned type. The CPU overprovisioning ratio affects the number of available vCPUs on a dedicated host. You can use the following formula to calculate the number of available vCPUs on a dedicated host of the overprovisioned type: Number of available vCPUs = Number of CPU cores × 2 × CPU overprovisioning ratio. In scenarios that do not require high CPU stability, such as development and test environments, you can increase the number of available vCPUs on a dedicated host by increasing the CPU overprovisioning ratio. This way, you can deploy more ECS instances of the same specification on the dedicated host and reduce the deployment cost. For example, the number of CPU cores on each g6s dedicated host is 52. If you set the CPU overprovisioning ratio of a g6s dedicated host to 4, the number of available vCPUs on the dedicated host is 416. Important You can set the CPU overprovisioning ratio for overprovisioned types g6s, c6s, and r6s. You cannot set the CPU overprovisioning ratio for overprovisioned type v5.	We recommend that you keep the default setting.
   Duration	Select a subscription duration based on your business requirements.	1 Month
   Auto-renewal	Specify whether to enable auto-renewal. Monthly subscription: The auto-renewal period is one month. Yearly subscription: The auto-renewal period is one year.	Not Enabled
   Terms of Service	Read and select Dedicated Host Terms of Service.	Select Dedicated Host Terms of Service.

6. Click Preview.

7. In the Preview dialog box, confirm the configurations and click Create Order.

8. Complete the payment as prompted.