Why is Used Size larger than LUN Size in the result of "lun show -instance"?
Applies to
- Logical Unit Number(LUN)
- ONTAP 9
Answer
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.
Example:
cluster::> lun show -instance
Vserver Name: svm1
LUN Path: /vol/vol1/lun1
Volume Name: vol1
Qtree Name: ""
LUN Name: lun1
LUN Size: 350GB
OS Type: linux
Space Reservation: enabled
Serial Number: 801mG?QMdRIe
Serial Number (Hex): 3830316d473f514d64524965
Comment:
Space Reservations Honored: false
Space Allocation: disabled
State: online
LUN UUID: 39597210-bb89-44bf-ac06-c926e55c4cd0
Mapped: unmapped
Used Size: 351.4GB
Additional Information
Bug 1211279 - Inconsistency reported between LUN size and used size