Dedicated Host (DDH) provides a dedicated hosting environment for a single tenant based on the virtualization technology of Alibaba Cloud. DDH offers flexible services that enable you to exclusively use all the physical resources of a cloud host at low cost.
DDH provides a dedicated hosting environment for a single tenant. You can exclusively use all the physical resources of a cloud host, such as the CPUs, memory, and network interface controller. This way, the data security is ensured. Each dedicated host has a unique machine code to meet the strict security and compliance requirements of various industries and enterprises.
- Flexible deployment
You can specify a dedicated host when you create an ECS instance. If you do not specify a dedicated host, the system selects a dedicated host to deploy the ECS instance. In addition, the host association feature allows you to associate an ECS instance with a dedicated host. Even if the instance enters the Stopped state, it is deployed on the original physical server. This helps you maintain the same deployment method for ECS instances.
- Flexible migration
You can migrate an ECS instance between two dedicated hosts or between a shared host and a dedicated host.
- DDH provides the CPU overprovisioned dedicated host type. When you create an ECS instance, you can customize its vCPU-to-memory ratio to improve the deployment of services that have a low CPU load, such as development, testing, and system O&M. The cost of cloud migration is reduced. The cost of deploying an ECS instance on a dedicated host can be up to 48% less than the cost of deploying an instance by using a traditional method. For more information about the CPU overprovisioned dedicated host type, see Dedicated host types.
- DDH allows you to bring your own license (BYOL) to Alibaba Cloud. If your license is assigned based on the numbers of CPU cores, CPU sockets, and virtual machines, you can continue to use your own license on a dedicated host. Furthermore, you are still subject to the terms of the license. DDH lowers the cost of migrating your business to the cloud.
- If you enable the economical mode for an ECS instance, the CPU and memory resources that are used by the instance are released after the instance is stopped.
DDH provides the automatic instance migration feature. If a DDH failure occurs after you enable this feature for a dedicated host, the ECS instances on the dedicated host are migrated to another host. In addition, you can migrate an ECS instance between two dedicated hosts without stopping the instance. You can also enable load balancing for your ECS instance to improve the availability of your services.