anchor.diff:        zones:
         - us-west-2a
         - us-west-2b
  +      rootVolume:
  +        iops: 4000
  +        size: 500
  +        type: io1
         type: m5.xlarge
     replicas: 3
   compute: <2>
  
positive.code: <2> If you do not provide these parameters and values, the installation program
  provides the default value.
  <3> You can optionally provide the `sshKey` value that you use to access the
  machines in your cluster.
negative.code:   platform:
      aws:
        rootVolume:
          iops: 2000
          size: 500
          type: io1 <4>
        type: c5.4xlarge
        zones:
        - us-west-2c
    replicas: 5
  