Today I had a customer who seemingly at random times lost connections to their QNAP NFS datastore. This only happend at night however.
This is what they saw in the vSphere client:
They could browse the datastore without issues and the VM worked fine if they removed it from inventory and re-added it again.
Since the host had other datastores and they did not have any issues, I started to look into the configuration of the QNAP network attached storage.
Under hardware I spotted that Enable hard disk standby mode if no access within the specific time period was enabled:
I cleared the checkbox and we have not seen the issue again.
As always, if this helped you please leave a comment! 🙂