Reagrding Netapp Volume Capacity Values

[vemus]

Hi Team ,

we're using physical used capacity to compute various metrics. We've observed that for some volumes, the used capacity and physical used capacity values are the same, while for others, they differ.

Here are the details from our NetApp system (version 9.13):

```
A250::> volume show -fields size, available, total, used, physical-used
vserver volume      size     available  total    used     physical-used
------- ----------  -------  ---------  -------  -------  -------------
A250-01 vol0        151.3GB  72.74GB    143.7GB  70.99GB  68.25GB
A250-02 vol0        151.3GB  77.03GB    143.7GB  66.70GB  62.60GB
svm1    Lun_1       2.06GB   2.06GB     2.06GB   632KB    632KB
svm1    Lun_test_3  10.30GB  10.30GB    10.30GB  692KB    692KB
svm1    svm1_root   1GB      970.3MB    972.8MB  2.48MB   7.96MB
```
We've tried to understand the reasons behind this discrepancies but couldn't get a clear explanation.

Could you please help us understand about this  volume capacity values.

Thank You !

[cedric_renauld]

hello,

have you other VOL, or juste VOL0  and root vol to compare ?

For the vol hosting LUN,it's could be normal to "reserve" the sapce to garante the security of LUN iops

For ohter vol in NAS mode, like VOL0 or root, this vol dont have any reservation, and they benefit of the dedup action

[vemus]

Idily used and physical used capacity values are differenet , but for 2 volunmes the used and physical used is same, we need to understand what could be the reason behind that

[cedric_renauld]

Ok,

Can you try this command :

volume show -field space-guarantee

And send us the result , pls

[vemus]

Hi cedric_renauld,

Pls find the below details

Vserver Name: A250-02

Volume Name: vol0 

Space Guarantee Style: volume

Vserver Name: A250-02

Volume Name: vol0

Space Guarantee Style: volume

Vserver Name: svm1
Volume Name: Lun_test_3

Space Guarantee Style: none

Vserver Name: svm1
Volume Name: svm1_root

Space Guarantee Style: volume

Vserver Name: svm1
Volume Name: Lun_test_3

Space Guarantee Style: none

For  Lun_1  ,   Lun_test_3 , space guarantee is none, what does mean, is that the reason to get the same value for used and physical used values.

Thanks in Advance.