Used Size is usually slightly larger than LUN Size because: LUN Size reports only the size of total L0 blocks that hold actual user data. Used Size reports the size of total L0 blocks and indirect blo...Used Size is usually slightly larger than LUN Size because: LUN Size reports only the size of total L0 blocks that hold actual user data. Used Size reports the size of total L0 blocks and indirect blocks that hold metadata/non-user data. cluster::> lun show -instance Vserver Name: svm1 LUN Path: /vol/vol1/lun1 Volume Name: vol1 LUN Name: lun1 LUN Size: 350GB LUN UUID: 39597210-bb89-44bf-ac06-c926e55c4cd0 Used Size: 351.4GB Bug 1211279 - Inconsistency reported between LUN size and used size