NVMe is just how the storage is surfaced -- the hardware programming interface for the block device. Hardware iSCSI initiators (HBAs) also have a hardware progr

NVMe is just how the storage is surfaced -- the hardware programming interface for the block device. Hardware iSCSI initiators (HBAs) also have a hardware programming interface, but at the end of the day you talk SCSI over that interface. NVMe is a better match for the the storage operations supported by EBS. A bonus is that by surfacing EBS over NVMe there is a common storage interface for both managed storage volumes and local NVMe storage.