In order to set the disk size for Kubernetes minions on AWS, you will need to SSH into each individual minion and modify the /etc/kubernetes/manifests/kube-apiserver.yaml file. Within this file, you will need to find the --storage-backend flag and set its value to aws. Next, save and close the file. Finally, run the following command to apply the changes:
kubectl apply -f /etc/kubernetes/manifests/kube-apiserver.yaml
This will update the size of the respective disks for all of the minions in the Kubernetes cluster.