Hyper-V VSS snapshot import delay
Challenge
Cause
Apparently Dell VSS hardware provider continues to write some data to VSS snapshot after execution of DoSnapshotSet method(after returning S_OK code), and if we try to immediately import VSS snapshot, we could backup inconsistent data from that VSS snapshot.
Solution
Open registry editor on Veeam Backup console
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication
Create DWORD parameter:
HvDelayBeforeSnapshotImportCompleteSec
Set it to 90 seconds(or more if your hardware VSS provider requires more time).
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