The following error message is displayed in the SnapManager for Hyper-V report and the Windows Event log: Error: Vss Requestor - Backup Components failed. Writer Microsoft Hyper-V VSS Writer involved in backup or restore encountered a retryable error. Writer returned failure code 0x800423f3. Writer state is XXX. For more information, see the Hyper-V-VMMS event log in the Windows Event Viewer.

If you receive a VSS retry error that causes your application-consistent backup to fail, SnapManager for Hyper-V retries the backup three times with a wait of one minute between each attempt.

You can configure the number of retries (retry count) and the duration of wait time between the retries (retry interval) using the following registry keys:

Key: HKLM\System\CurrentControlSet\Services\OnCommandHyperV\Parameters DWORD value in seconds: vss_retry_sleep (The time duration to wait between retries) DWORD value: vss_retry (Number of retries)

These settings are at the Hyper-V host level and the keys and values should be set on the Hyper-V host for each virtual machine. If the virtual machine is clustered, the keys should be set on each node in the cluster.

You must restart SnapManager for Hyper-V after making changes to or adding these registry keys.