Ultra disks don't have an extra charge for each VM that they're mounted to. They're billed on the total IOPS and MBps that the disk is configured for. Normally, an ultra disk has two performance throttles that determine its total IOPS/MBps. However, when configured as a shared ultra disk, two more performance throttles are exposed, for a total of four. These two additional throttles allow for increased performance at an extra expense and each meter has a default value, which raises the performance and cost of the disk.
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