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The limitations of EBS multi-attachment are described in the following document.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volumes-multi.html#considerations
It is stated in the constraints that the use of Nitro-based instances is required.
Multi-Attach enabled volumes can be attached to up to 16 Linux instances built on the Nitro System that are in the same Availability Zone. You can attach a volume that is Multi-Attach enabled to Windows instances, but the operating system does not recognize the data on the volume that is shared between the instances, which can result in data inconsistency.
The documentation here shows that the p2 instance type is not compatible with Nitro System.
With the instance types you mentioned, I believe G4dn, G5, and G5g are available.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html#ec2-nitro-instances
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