Hi Kartikbha, When defining a config, the instances section is basically a set of instance templates that you are defining. So for your worker group, you could define a worker template, and your master group would use the master template. Given this separation, you would assign the worker template to your worker cluster group definition. instances { worker-instance { type: d2.2xlarge rootVolumeSizeGB: 100 # 100GB ... } master-instance { type: super.powered.xxxlarge } } .... cluster { masters { instance: ${master-instance} } workers { instance: ${worker-instance} } } I think that EBS root volume type is specific to the ami you choose. Looking at the aws documentation: https://aws.amazon.com/ec2/instance-types/ It looks like d2.2xlarge doesn't say anything about EBS, so I may be assuming incorrectly but I don't think it is of the EBS kind.
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