We are using NFS volumes as datastores for vSphere.
Volumes are managed via a dataset in UM.
They are thin provisionned with autogrow.
The volume nearly full threshold is set to 80 %.
The volume full threshold is set to 95%.
The vSphere admin configured alerts when datastore usage reaches 80%.
Example of what happen
Maximum volume space = 2 TB
Current allocated volume space = 1.7 TB
Current used space = 1.5 TB
Current % of used space from vSphere viewpoint = 88%
Current % of used space from UM viewpoint = 75%
Current % of used space from DOT = 88%
Many alerts are generated because from vSphere viewpoint the datastore usage is over 80%.
From UM viewpoint there is enough space because the current volume size does not reach the nearly full threshold.
From DOT viewpoint there is no need to autogrow the volume as it does not reach the autogrow threshold (~95%).
Do we have to avoid setting vSphere alerts on datastores as they are inconsistent ?
Do we better have to use UM alarms ?
Is there a way in UM to enforce volume growing up when used space reaches a given threshold of the current volume size ?
Many thanks for your help on this topic that could be part of best practices of vSphere on NetApp storage.