Valid on Windows Hyper-V systems.
Symptom
When you back up multiple virtual machines that reside on the same cluster shared volume concurrently, Windows warning ID 1584 appears in Windows Event Viewer. Windows warning ID 1584 is as follows:
A backup application initiated a VSS snapshot on Cluster Shared Volume Volume1 (Cluster Disk 8) without properly preparing the volume for snapshot. This snapshot may be invalid and the backup may not be usable for restore operations. Please contact your backup application vendor to verify compatibility with Cluster Shared Volumes.
Solution
Microsoft confirms that the message is a false alarm. You can ignore the message.
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