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Dedicated Host:Terms

Last Updated:Aug 22, 2023

This topic describes the terms that are 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 only tenant of a host, you do not need to share the physical resources of the host with other tenants.

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 type of a dedicated host refers to the specifications of the physical server that corresponds to the dedicated host. These specifications include the CPU model, memory size, local storage space, the number of CPU cores, the number of CPU sockets, and the number of vCPUs. The predefined ECS instances on a dedicated host can be used in the same scenarios as the ECS instances on a shared host.

For more information, see Dedicated host types.

CPU overcommit ratio

In scenarios that require lower CPU stability, you can increase the CPU overcommit ratio of a dedicated host. This way, you can increase the number of available vCPUs on the dedicated host and reduce the deployment cost of a single ECS instance.

BYOL

Bring Your Own License (BYOL) allows you to migrate your business to the cloud by using your existing per-socket or per-core licenses that are bound to sockets or physical cores.

region and zone

A region or zone is the physical location of the data center where the physical server of a dedicated host is located. Regions are independent of each other. Zones are isolated from each other. We recommend that you create a dedicated host in a region close to you or your target users. This reduces network latency and increases data transmission speed.

For more information, see Regions and Zones.

ECS

Elastic Compute Service (ECS) is a basic cloud computing service that is 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

Resource groups are used to group your resources by usage, permission, and region, so that you can manage the resources in a hierarchical manner by user and project. You can add the 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.