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Specify type of EBS root volume #45
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set default type to 'gp2' add ebs-root-vol-type parameter to overwrite
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It seems like the ami EBS type is set to 'standard' which is a previous generation HDD.
This type of EBS Volume costs money for I/O and in that case is kind of hard to estimate.
I think it makes sense to change the default EBS type to "gp2" since this is also the default type when launching instances from web console.
This PR changes the default ebs-vol-type for root and additional volumes from 'standard' to 'gp2' which is the api name for "general purpose ssd".
an additional script parameter
ebs-root-vol-typeis introduced to overwrite the type.see also: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html