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ERROR_VOLSNAP_HIBERNATE_READY
Volume Shadow Copy preparation has reached the state required for hibernation.
ERROR_VOLSNAP_HIBERNATE_READY identifies the condition that this condition The volume snapshot stack uses this informational result to signal that snapshot-related work is ready for the system hibernation transition. It is part of coordination between storage filters, VSS, and power management.
Where the result appears
- hibernation preparation on systems using volume snapshots.
- storage-filter power callbacks.
- VSS-aware backup products.
- diagnostics of hibernation delays involving snapshot providers.
How to interpret the result
Interpret the numeric value in the Win32/LRESULT domain and in the context of the API that returned it. Preserve this result before wrappers convert it to an HRESULT, exception, Boolean failure, or provider-specific message. When recording it, note whether the operation produced usable output; this determines whether the value is completion information, control flow, or a terminal failure.
Diagnostic evidence to collect
- volume identities and snapshot set IDs.
- VSS writer and provider state.
- power-transition timestamp.
- filter-driver stack and pending I/O count.
A diagnostic record for it should contain the API name, input flags, relevant handles or object identifiers, thread and process identity, timestamp, and the immediately preceding state transition. Those fields are more useful than a generic screenshot because they show which contract and lifecycle phase produced the value.
Handling and recovery
Allow the power transition to continue after all participating components report readiness. Backup or filter software must release transient resources and avoid starting new snapshot work after the hibernation boundary has been established.
Retry after this result only when an external state relevant to this operation can actually change. When it is rooted in object state, unsupported capability, ownership, or invalid sequencing, an unchanged retry repeats the defect and can obscure the first useful diagnostic record.
Common misinterpretation
This code is not a guarantee that the machine has already hibernated or that every VSS writer is healthy. It marks one storage-stage milestone.
Guidance for developers
Keep the original this result value and its Win32 domain in structured telemetry. If it crosses COM or another HRESULT-based boundary, store both the source Win32 value and the converted result. If it crosses JSON, RPC, or a database boundary, include error_domain, error_code, operation, and object_state so the receiver does not apply a second conversion.
An automated test should construct the specific state that leads to this result, assert the exact returned value, and verify cleanup on both the normal and exceptional path. The result test should additionally prove that the caller does not collapse this status into an unrelated generic error and does not retry forever.
References
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