What does HRESULT 0x80042932 (VDS_E_VD_ALREADY_COMPACTING) mean?

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Description:

A second VDS compact request was made while compaction of the same virtual disk is active.

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VDS_E_VD_DISK_ALREADY_EXPANDING	VDS_E_VD_ALREADY_MERGING

VDS_E_VD_ALREADY_COMPACTING

This code is specific to duplicate compaction. VDS already has the virtual disk in its COMPACTING transition, so another IVdsOpenVDisk::Compact request is rejected rather than queued. The result differs from a general state conflict: it tells the caller that the same kind of long-running operation is already underway.

Why this state matters

Compaction changes physical backing-file allocation, not the advertised virtual capacity. A monitoring loop should follow the original asynchronous result and later compare physical size; repeatedly starting compaction cannot be used as a progress probe. The VDS object state is the correct lifecycle signal.

Diagnostic focus

Serialize compact requests per virtual disk and store the original asynchronous operation handle.
Use VDS_VDISK_STATE and the original IVdsAsync result to monitor completion.
Do not compare only guest-visible free space; VDS exposes separate virtual and physical size properties.
If no caller believes it started compaction, audit concurrent administration tools and leaked management operation state.

Technical references

IVdsOpenVDisk::Compact · compact vdisk command · VDS_VDISK_STATE · VDS_VDISK_PROPERTIES · IVdsOpenVDisk

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