I talked the last days to Christian Furchert, NetApp SE from office Hamburg.
We discovered a critical bug inside of Ontap 9.1. Please talk to your local NetApp SE
that can help to understand if this bug will hit you too. He can contact Christian for
more details on this.
While this bug is existing I could imagine we cannot support 9.1 until they
released a patch for this. We forwarded this issue already to our QA.
Kind regards und ein fröhliches Moin Moin aus Norddeutschland
P.S. It's not a bug in combination with Veeam it seems to be a general problem
with one OS function we use intensively.