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ERROR_VOLSNAP_PREPARE_HIBERNATE
What ERROR_VOLSNAP_PREPARE_HIBERNATE means
This is a progress or retry-later condition during coordination between VSS, storage, and power management. It does not by itself indicate that the shadow copy or the volume is corrupt.
Where it appears
- system hibernation with active shadow-copy infrastructure
- backup providers quiescing volumes
- storage filters responding to power transition
Likely causes
- normal VSS preparation still in progress
- a provider or writer taking longer than expected
- I/O backlog delaying volume quiescence
Evidence to collect
- VSS writer and provider state
- System and Application events from VSS and Volsnap
- hibernation start time and timeout
- active backup jobs and storage latency
How to respond
Allow the preparation phase to finish and avoid starting competing snapshot work. If the state persists, identify the blocked VSS writer or provider, clear failed backup sessions using supported tools, and retest hibernation.
Diagnostic interpretation
For this particular status, the decisive evidence is VSS writer and provider state, System and Application events from VSS and Volsnap. Those details separate the documented condition from unrelated failures that happen to occur nearby.
Record the numeric code together with the symbolic name ERROR_VOLSNAP_PREPARE_HIBERNATE, the API or subsystem that produced it, and the first preceding failure. A later cleanup occurrence may describe a consequence instead of the initiating defect.
Example
A diagnostic trace records this result after an operation changes subsystem state. The result investigation should follow the first state-changing call, validate its resulting state, and classify later cleanup messages as secondary evidence.
Implementation guidance
Code handling this result should distinguish a terminal failure from a warning, progress indication, or request to repeat after a defined state change. When handling it, preserve handles and output fields only where the originating API explicitly keeps them valid. The path needs bounded retries and cleanup that tolerates partial initialization.
Validation after remediation
Repeat one controlled operation that previously produced this result. Verify both disappearance of the status and completion of the specific state transition described above. Adjacent messages around it must also be reviewed so a fallback is not mistaken for a complete repair.
References
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