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VDS_E_SUBSYSTEM_ID_IS_NULL
This is a provider contract/data-quality failure. VDS hardware providers expose subsystem objects that group controllers, LUNs, drives, ports, and related storage capabilities. The HRESULT says the provider returned a null subsystem identification string, so VDS cannot rely on the identification field expected for that object.
Why this state matters
The failure should not be mapped to an iSCSI target name or disk serial number without evidence. A subsystem is a different VDS object type and can represent an array or storage system that surfaces multiple LUNs and paths. The useful question is which provider and subsystem object returned incomplete properties.
Diagnostic focus
- Identify the hardware provider and subsystem VDS object ID before refreshing the object model.
- Query other subsystem properties and related controllers/LUNs to determine whether only the identification string is absent or the object is generally incomplete.
- Compare provider results before and after hardware-provider reenumeration and refresh.
- Collect vendor provider and array management logs if the same subsystem consistently returns a null identification field.
Technical references
VDS interfaces and structures · MS-VDS error codes · VDS_PATH_INFO · IVdsLun · VDS common return codes
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