topic Re: Reagrding Netapp Volume Capacity Values in ONTAP Discussions

Reagrding Netapp Volume Capacity Values

vemus — Thu, 30 May 2024 04:51:56 GMT

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 !

Re: Reagrding Netapp Volume Capacity Values

cedric_renauld — Sat, 01 Jun 2024 15:35:09 GMT

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

Re: Reagrding Netapp Volume Capacity Values

vemus — Mon, 03 Jun 2024 06:39:16 GMT

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

Re: Reagrding Netapp Volume Capacity Values

cedric_renauld — Mon, 03 Jun 2024 06:44:18 GMT

Ok,

Can you try this command :

volume show -field space-guarantee

And send us the result , pls

Re: Reagrding Netapp Volume Capacity Values

vemus — Wed, 05 Jun 2024 09:36:31 GMT

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.