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nf-vds-ivdssubsystem-queryluns.md

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UID title description helpviewer_keywords old-location tech.root ms.assetid ms.date ms.keywords req.header req.include-header req.target-type req.target-min-winverclnt req.target-min-winversvr req.kmdf-ver req.umdf-ver req.ddi-compliance req.unicode-ansi req.idl req.max-support req.namespace req.assembly req.type-library req.lib req.dll req.irql targetos req.typenames req.redist ms.custom f1_keywords dev_langs topic_type api_type api_location api_name
NF:vds.IVdsSubSystem.QueryLuns
IVdsSubSystem::QueryLuns (vds.h)
The IVdsSubSystem::QueryLuns method (vds.h) returns an enumeration of LUNs surfaced in the subsystem. This method applies to hardware provider objects only.
IVdsSubSystem interface [VDS]
QueryLuns method
IVdsSubSystem.QueryLuns
IVdsSubSystem::QueryLuns
QueryLuns
QueryLuns method [VDS]
QueryLuns method [VDS]
IVdsSubSystem interface
base.ivdssubsystem_queryluns
vds/IVdsSubSystem::QueryLuns
vdshwprv/IVdsSubSystem::QueryLuns
base\ivdssubsystem_queryluns.htm
base
b8e17085-03cd-40d1-accf-6ea5fa69de65
08/08/2022
IVdsSubSystem interface [VDS],QueryLuns method, IVdsSubSystem.QueryLuns, IVdsSubSystem::QueryLuns, QueryLuns, QueryLuns method [VDS], QueryLuns method [VDS],IVdsSubSystem interface, base.ivdssubsystem_queryluns, vds/IVdsSubSystem::QueryLuns, vdshwprv/IVdsSubSystem::QueryLuns
vds.h
Windows
Windows Vista [desktop apps only]
Windows Server 2003 [desktop apps only]
Uuid.lib
Windows
19H1
IVdsSubSystem::QueryLuns
vds/IVdsSubSystem::QueryLuns
c++
APIRef
kbSyntax
COM
Uuid.lib
Uuid.dll
IVdsSubSystem.QueryLuns

IVdsSubSystem::QueryLuns

-description

[Beginning with Windows 8 and Windows Server 2012, the Virtual Disk Service COM interface is superseded by the Windows Storage Management API.]

Returns an enumeration of LUNs surfaced in the subsystem. This method applies to hardware provider objects only.

-parameters

-param ppEnum [out]

The address of an IEnumVdsObject interface pointer that can be used to enumerate the LUNs as LUN objects. For more information, see Working with Enumeration Objects. Callers must release the interface and each of the LUN objects when they are no longer needed by calling the IUnknown::Release method.

-returns

This method can return standard HRESULT values, such as E_INVALIDARG or E_OUTOFMEMORY, and VDS-specific return values. It can also return converted system error codes using the HRESULT_FROM_WIN32 macro. Errors can originate from VDS itself or from the underlying VDS provider that is being used. Possible return values include the following.

Return code/value Description
S_OK
Returns the enumeration of LUNs in the subsystem. If the subsystem has no LUNs, the enumeration is empty.
VDS_E_PROVIDER_CACHE_CORRUPT
0x8004241FL
This return value signals a software or communication problem inside a provider that caches information about the array. Use the IVdsHwProvider::Reenumerate method followed by the IVdsHwProvider::Refresh method to restore the cache.
VDS_E_OBJECT_DELETED
0x8004240BL
The subsystem object is no longer present.
VDS_E_OBJECT_STATUS_FAILED
0x80042431L
The subsystem is in a failed state and is unable to perform the requested operation.
VDS_E_ANOTHER_CALL_IN_PROGRESS
0x80042404L
Another operation is in progress; this operation cannot proceed until the previous operation or operations are complete.

-remarks

The IEnumVdsObject interface includes all LUNs in the subsystem, regardless of LUN masking.

Implementers must return an empty enumeration object for each subsystem with zero LUNs.

If this method is called in two separate threads that are running simultaneously, the results may be inconsistent. If it is called in one thread while a method such as IVdsLun::Delete is called in another thread that is running simultaneously, the result could be a provider access violation. The hardware provider is responsible for serializing this query operation as needed to minimize such synchronization issues.

-see-also

IEnumVdsObject

IVdsHwProvider::Reenumerate

IVdsHwProvider::Refresh

IVdsSubSystem