Instance type right-sizing
AWS Application Migration Service launches a new instance type after every change of configuration on the source server, for example, added/removed disks, and added/removed RAM. When you use the instance type right-sizing feature Application Migration Service launches a test or cutover instance type that best matches the OS, CPU, and RAM of your source server. Set this feature to On to enable or to None to disable, in which case Application Migration Service launches the instance type as configured in your Amazon EC2 launch template.
Enable instance type right-sizing if you want to determine the instance type that is launched in AWS for all your test or cutover servers.
Important considerations:
The AWS instance type selected by AWS Application Migration Service when this feature is activated overwrites the instance type defined in your EC2 launch template.
Hardware changes and the resulting AWS instance type change may take up to 90 minutes to be processed by AWS Application Migration Service.
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The T family instance type is not supported for right-sizing. If you want to use the T family, avoid using right-sizing.
The available capacity for each Amazon EC2 instance type varies by Availability Zone and Region, and may be subject to your specific AWS account limits. For mission-critical workloads consider using Reserved Instances to guarantee capacity for specific instance types. Note that additional costs apply when reserving capacity.
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The right-sizing instance type selected by AWS Application Migration Service appears on the Server details tab.
Supported instance families:
The service provides recommendations from these instance families, which are available in most target Regions:
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c5
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m5
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c4
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m4
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r5
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r4
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i3
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d2
Supported instance families for the Thailand and Malaysia Regions:
The Asia Pacific (Thailand) , and Asia Pacific (Malaysia) Regions support only these instance families:
C6i
m6i
r6i
