Server Migration Center (SMC) allows you to migrate an Elastic Compute Service (ECS) instance across zones in a region and change the instance type at the same time based on your business requirements.
Use cases
Change the zone of an ECS instance
The available instance types of ECS instances in the current zone cannot meet your business requirements. You want to change the instance types of the instances to a specific instance type in a different zone within the same region.
You want to migrate ECS instances to another zone within the same region based on your business requirements.
Change the instance type of an ECS instance
You want to change the instance type of your ECS instance because the current instance type cannot meet your business requirements.
Benefits
High migration efficiency
You can migrate multiple ECS instances across zones at a time to improve migration efficiency.
Low costs
You do not need to purchase new ECS instances in other zones. This reduces costs.
Seamless upgrade
You can upgrade the configurations of ECS instances and migrate them across zones at the same time.
Simple and convenient operations
You can complete a cross-zone migration job with simple operations.
Migration process
The following figure shows the process of migrating an ECS instance across zones.
Limits
Spot instances do not support cross-zone migration.
You can change the number of vCPUs and the memory size of an ECS instance within the same instance family. For more information about instance families, see Overview of instance families.
NoteIf you want to change the instance type of an ECS instance to a different family across zones, we recommend that you perform a cross-zone migration first, and then change the instance type. For more information, see Upgrade the instance types of subscription instances or Change the instance type of a pay-as-you-go instance.
You can migrate up to 5 instances across availability zones in a single batch operation via the ECS console. To request an increase, contact technical support.
The following instance families do not support instance type changes across zones:
Heterogeneous computing instance families
ECS Bare Metal Instance families
Super Computing Cluster (SCC) instance families
u1, universal instance family
e, economy instance family
x86-based instance families
Big data instance families
Instance families with local SSDs
Security-enhanced instance families
Instance families of the eighth generation, including g8ise, g8a, g8i, g8ae, g8y, c8a, c8i, c8ae, c8y, r8a, r8i, r8ae, and r8y
Procedure
For more information about how to perform cross-zone migration, see Migration guide.