Applies to ONTAP 9 Clustered Data ONTAP 8.3 and later Microsoft Hyper-V Issue After upgrade to clustered Data ONTAP 8.3 or later, Hyper-V VMs respond sluggishly and Event ID 129 is being logged inside...Applies to ONTAP 9 Clustered Data ONTAP 8.3 and later Microsoft Hyper-V Issue After upgrade to clustered Data ONTAP 8.3 or later, Hyper-V VMs respond sluggishly and Event ID 129 is being logged inside the VM's Windows event log. The Windows event logs of the Hyper-V host are clean.