What does HRESULT 0x8004292D (VDS_E_VD_DISK_IS_COMPACTING) mean?

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Description:

The virtual disk is in the VDS compaction transition and cannot accept the requested operation.

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VDS_E_VD_DISK_IS_EXPANDING	VDS_E_VD_DISK_IS_MERGING

VDS_E_VD_DISK_IS_COMPACTING

VDS uses VDS_VST_COMPACTING while a compact operation reduces the physical size of a virtual-disk backing file. This HRESULT is returned to another operation that cannot run while that transition is active. It does not say that compaction failed or that the guest filesystem itself is being compressed.

Why this state matters

Compaction is an asynchronous virtual-disk metadata/storage operation. VDS permits compact on a detached disk and also on an attached disk that has been opened; the detailed state path differs for those cases. Diagnostics should therefore preserve both whether the disk is attached and the active compaction result rather than simply retrying a conflicting method.

Diagnostic focus

Wait for the compaction IVdsAsync result and capture its final HRESULT before starting the rejected operation.
Record whether the disk was detached, attached read-only, or attached with another access mode when compaction started.
Compare VirtualSize and PhysicalSize only after compaction completes; the two properties describe different sizes.
Avoid tight retry loops because they add state conflicts without advancing the compaction transition.

Technical references

IVdsOpenVDisk::Compact · compact vdisk command · VDS_VDISK_STATE · MS-VDS virtual disk state transitions · VDS_VDISK_PROPERTIES

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