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| VSS_E_UNEXPECTED_WRITER_ERROR | VSS_E_MAXIMUM_NUMBER_OF_SNAPSHOTS_REACHED |
VSS_E_SNAPSHOT_SET_IN_PROGRESS
VSS_E_SNAPSHOT_SET_IN_PROGRESS means that VSS is serializing shadow-copy creation and another requester has an active snapshot-set workflow. Starting a second set at that point is not supported.
What to do
- Wait for the active VSS operation to complete or fail, then retry the request.
- Coordinate backup schedules so multiple requesters do not start snapshot creation concurrently.
- On clustered or scale-out storage, verify that several nodes are not adding the same CSV volume or share at the same time.
Microsoft: serialized VSS state transitions
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