Avamar: Non-clustered Windows 2019 client with SQL Plugin backup generates cluster failure events
Summary: On Windows Server 2019, standalone servers not part of a cluster may generate Event 81 messages due to Cluster Application Programming Interface (API) calls, which do not affect functionality. ...
Symptoms
A Windows 2019 virtual machine (VM) that is not in a cluster, logged the following event in System event log:
Log Name: System Source: Microsoft-Windows-FailoverClustering-Client Date: <date> <time> Event ID: 81
This event does not impact Avamar functionality in any way.
Cause
Event ID 81 is generated when cluster-aware applications invoke Windows Cluster APIs to determine whether the server is part of a failover cluster. If the server is not configured as a cluster node, the API call fails, resulting in the logging of this event.
This behavior is expected and does not indicate a critical issue. The event is informational in nature and typically occurs due to the way certain applications interact with the system to assess cluster membership. It can be safely disregarded unless there are specific concerns related to clustering functionality.
Resolution
This behavior is expected and does not indicate a critical issue. The event is informational in nature and typically occurs due to the way certain applications interact with the system to assess cluster membership. It can be safely disregarded unless there are specific concerns related to clustering functionality.