Values.EbsBlockDeviceSourceConfiguration of requested EBS block device associated with the instance group.
type nonrec t = {volumeSpecification : VolumeSpecification.t option;EBS volume specifications such as volume type, IOPS, size (GiB) and throughput (MiB/s) that are requested for the EBS volume attached to an Amazon EC2 instance in the cluster.
*)device : String_.t option;The device name that is exposed to the instance, such as /dev/sdh.
*)}