This page defines the core terms used in Dedicated Host (DDH).
Dedicated host
A dedicated host is a cloud host whose physical resources are dedicated to a single tenant. As the sole tenant, you do not share the physical resources of the host with anyone else.
For more information, see What is DDH?.
Shared host
A shared host is a cloud host whose physical resources are shared by multiple tenants. Generally, an ECS instance is deployed on a shared host.
Dedicated host type
The dedicated host type defines the specifications of the underlying physical server, including:
| Specification | Description |
|---|---|
| CPU model | The processor family and generation |
| CPU sockets | The number of physical CPU sockets |
| CPU cores | The number of physical CPU cores |
| vCPUs | The total number of virtual CPUs available |
| Memory | The total memory size |
| Local storage | The local storage capacity |
ECS instances on a dedicated host support the same workloads as instances on a shared host.
For more information, see Dedicated host types.
CPU overcommit ratio
The CPU overcommit ratio controls how many vCPUs are available relative to the physical CPU cores on a dedicated host. Increasing the ratio raises the number of available vCPUs, which lowers the per-instance deployment cost. Use this setting for workloads that tolerate variable CPU performance.
Bring Your Own License (BYOL)
Bring Your Own License (BYOL) lets you migrate your business to the cloud using existing licenses tied to physical sockets or cores. Supported license models include per-socket and per-core licenses.
Region and zone
A region is the physical location of the data center where a dedicated host resides. A zone is an isolated domain within a region.
Regions are independent of each other.
Zones within the same region are isolated from each other.
Deploy a dedicated host in a region close to you or your target users to reduce network latency and improve data transfer speed.
For more information, see Regions and zones.
Elastic Compute Service (ECS)
Elastic Compute Service (ECS) is a basic cloud computing service provided by Alibaba Cloud.
For more information, see What is ECS?.
ECS instance
An ECS instance is a virtual server that includes basic components such as vCPUs, memory, an operating system (OS), network configurations, and disks.
For more information, see Overview.
Resource group
A resource group organizes your Alibaba Cloud resources by usage, permission, and region, enabling hierarchical management by user and project. You can add a dedicated host to a resource group.
For more information, see Resource groups.
ECS console
The ECS console is the web interface for managing ECS and DDH resources.