Applies to Trident Ontap-SAN driver Answer It is by design. In order to ensure readability of the LUN, volume must have an extra space. Additional Information Trident calculates the size of volumes as...Applies to Trident Ontap-SAN driver Answer It is by design. In order to ensure readability of the LUN, volume must have an extra space. Additional Information Trident calculates the size of volumes as follows: Total volume size = [(PVC requested size) / (1 - (snapshotReserve percentage) / 100)] * 1.1