Values.Ec2EbsVolumeSourceSpecifies the EBS volume.
type nonrec t = {sizeGiB : Integer.t option;The EBS volume size in GiB.
*)iops : EbsIops.t option;The IOPS per volume.
*)throughputMiB : EbsThroughputMiB.t option;The throughput per volume in MiB.
*)}