Volume capacity Values

[vemus]

Hi Team

We need some clarification regarding volume capacity values .

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 these discrepancies but couldn't get a clear explanation.

Could you please help us understand this .

Thank You!

[jaikumar]

The used (or used size ) indicate the total logical size that is used in the volume and it includes the de-duplicated data,compressed state , compacted data and the reclaimable data that is there in the lun /volume. 

while the physical size is the actual phyiscal block that the data is using on the volume (read it like the data is is used on the phyiscal disk).

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