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STATUS_VHD_DIFFERENCING_CHAIN_ERROR_IN_PARENT
STATUS_VHD_DIFFERENCING_CHAIN_ERROR_IN_PARENT means the current child may be readable, but an earlier parent required to satisfy some virtual reads failed to open or validate. The reported child is not necessarily the file that contains the underlying fault.
This differs from STATUS_VHD_PARENT_VHD_NOT_FOUND, which describes the immediate parent lookup, and from STATUS_VHD_DIFFERENCING_CHAIN_CYCLE_DETECTED, which describes an invalid loop. Here the provider has progressed along the chain and encountered a failure in an ancestor.
Locate the first failing ancestor
- Enumerate the whole chain from leaf to base and test each link in read-only mode while recording its exact failure.
- Retain all related checkpoint and backup files; replacing only the visible child can destroy evidence about the ancestor problem.
- Resolve the earliest missing, inaccessible or corrupt parent before retrying a merge from the child.
References
- Microsoft: VHDX differencing-disk overview
- Microsoft: virtual-disk APIs and dependencies
- Microsoft: Merge-VHD
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