What does HRESULT 0x80042931 (VDS_E_VD_DISK_ALREADY_EXPANDING) mean?

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Description:

An expand request was issued for a virtual disk that already has an expansion in progress.

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VDS_E_VD_DISK_ALREADY_OPEN	VDS_E_VD_ALREADY_COMPACTING

VDS_E_VD_DISK_ALREADY_EXPANDING

This HRESULT is the duplicate-operation form of the VDS expansion state. Unlike VDS_E_VD_DISK_IS_EXPANDING, which can reject a different operation because expansion is active, this code says another expand has been requested while the first expand is still running. The second request does not queue a new target size.

Why this state matters

Because Expand is asynchronous, management code must retain the returned IVdsAsync and serialize capacity changes for each virtual disk. A retry timer that calls Expand again before observing the original final result can generate this HRESULT even when the provider is healthy.

Diagnostic focus

Correlate expand calls by VDS object ID and backing path and allow only one active expansion per virtual disk.
Retain and wait on the original IVdsAsync interface; record its final HRESULT and requested NewSize.
Do not interpret the duplicate request as evidence that the first target size was accepted or reached.
After completion, query VirtualSize and recalculate any further expansion from the current capacity.

Technical references

IVdsOpenVDisk::Expand · IVdsOpenVDisk · VDS_VDISK_STATE · VDS_VDISK_PROPERTIES · MS-VDS error codes

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