The number of I/O operations per second (IOPS) that the volume supports.
The volume size, in gibibytes (GiB). This can be a number from 1 - 1024. If the volume type is EBS-optimized, the minimum value is 10.
The volume type. Valid options are 'gp2', 'io1' and 'standard'.
The number of EBS Volumes to attach per instance.