Set storage use limit on ONTAP side

[ArtemKaba]

Brief: how to set up limit on storage utilisation in case of using ontap-nas (or ontap-nas-economy) driver?
We have trident installation with Openshift 3.11 cluster, backend was create at storage that we aren't own.
And now ONTAP Administrator wants to set limit to use his storage device because we can fill in all disks at any time.
How would he can acheive it?
We already have added line "limitVolumeSize" to backend configuration, but it is not under ONTAP Admin's control.

I hope I clearly explained the problem :)

[balaramesh]

Hi @ArtemKaba

You can set storage limits at the K8s level by defining Storage Resource Quotas and also limit the volume size provisioned by Trident using the limitVolumeSize parameter. The expectation is for the K8s admin to work with the storage admin when establishing these limits within k8s. As I understand, the question is wrt establishing limits at the ONTAP cluster itself. Take a look at our best practices for configuring ONTAP backends. You can limit the max number of volumes and set the maximum size per volume. You can also limit the aggregates assigned to your Trident SVM

[ArtemKaba]

@balaramesh as i know there is no way to set the maximum size per volume for SVM in ONTAP.
In case of using nas-economy driver, trident will create 200 qtrees in volume and then create new one. And every volume can expand as much as possible.
As a result we can establish limit only on the k8s side.

[gnarl]

@ArtemKaba we tested resize and don't agree with your statement. If you set the limitVolumeSize parameter for the backend that will enforce the maximum volume size when resizing a volume. Can you verify this?

[ArtemKaba]

@gnarl You absolutely right. But I am talking about limiting storage usage exactly on ONTAP side.
Owner of storage device can't set up quota for our k8s cluster because we have svm-admin permissions as well as limitVolumeSize parameter under our control.

[darthVikes]

This ref; shows limiting the size per the user role below URL link but I don't see this now listed in the newer documentation for v20.04? Any idea why that was removed? I would also like to ensure we can also enforce this on the OnTap side as well as people that may have access to the PVC side are different roles.

https://netapp-trident.readthedocs.io/en/stable-v19.01/dag/kubernetes/storage_configuration_trident.html#limit-the-maximum-size-of-volumes-created-by-the-trident-user