If the ECS instances created on a dedicated host are no longer suitable for your workloads, you can upgrade or downgrade the instance types (vCPU and memory) or modify the public bandwidth to address your workload requirements.

Prerequisites

A subscription ECS instance is created on a dedicated host. For more information, see Create an ECS instance on a dedicated host.

Background information

You can change the following specifications for subscription ECS instances on a dedicated host.

You can also assign a public IP address to a created ECS instance. For more information, see Assign a public IP address after an instance is created.

Upgrade or downgrade the instance type

When you upgrade or downgrade the instance type of an instance, you must increase or decrease the number of vCPUs and memory size at the same time. The following table is a list of scenarios for upgrading and downgrading instance types.
Note For more information about whether an instance type supports upgrade or downgrade, see Instance families that support instance type changes.
Upgrade or downgrade Operation Apply changes
Upgrade Upgrade configurations of subscription instances You can restart the instance and apply the new instance type by using one of the following methods.
Downgrade You can restart the instance in one of the following ways to apply the new instance type.

Upgrade or downgrade the public bandwidth

The following table is a list of scenarios for upgrading and downgrading the public bandwidth.

Upgrade or downgrade Operation Takes effect immediately Scope Description
Upgrade Upgrade the public bandwidth of a subscription instance Yes Subscription ECS instances that are not bound to elastic IP addresses (EIPs) The basic bandwidth of the ECS instance is increased. The public or private IP address of the ECS instance is not changed after the upgrade.
Downgrade Downgrade the public bandwidth during renewal Takes effect in the next billing cycle Subscription ECS instances You can adjust the public bandwidth during renewal. When the public bandwidth is reduced to 0 Mbit/s, the public IP address of the ECS instance is released in the new billing cycle.
Downgrade the bandwidth of a subscription ECS instance in real time Yes Subscription ECS instances that are not bound to elastic IP addresses (EIPS) The basic bandwidth of the ECS instance is reduced. The public or private IP address of the ECS instance is not changed after the downgrade.