IVssBackupComponents::IsVolumeSupported method (vsbackup.h)

Article
10/13/2021

The IsVolumeSupported method determines whether the specified provider supports shadow copies on the specified volume or remote file share.

Syntax

HRESULT IsVolumeSupported(
  [in]  VSS_ID   ProviderId,
  [in]  VSS_PWSZ pwszVolumeName,
  [out] BOOL     *pbSupportedByThisProvider
);

Parameters

[in] ProviderId

Provider identifier. If the value is GUID_NULL, IsVolumeSupported checks whether any provider supports the volume or remote file share.

[in] pwszVolumeName

Volume name or UNC path of remote file share. The name or UNC path must be in one of the following formats and must include a trailing backslash (\):

The path of a mounted folder, for example, Y:\MountX\
A drive letter, for example, D:\
A volume GUID path of the form \\?\Volume{GUID}\ (where GUID identifies the volume)
A UNC path that specifies a remote file share, for example, \\Clusterx\Share1\

[out] pbSupportedByThisProvider

Address of a caller-allocated variable that receives TRUE if shadow copies are supported on the specified volume or remote file share, or FALSE otherwise.

Return value

The following are the valid return codes for this method.

Value	Meaning
S_OK	Successfully returned the provider support information.
E_ACCESSDENIED	The caller does not have sufficient backup privileges or is not an administrator.
VSS_E_NESTED_VOLUME_LIMIT	The specified volume is nested too deeply to participate in the VSS operation. Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP: This return code is not supported.
E_OUTOFMEMORY	The caller is out of memory or other system resources.
VSS_E_BAD_STATE	The backup components object is not initialized, this method has been called during a restore operation, or this method has not been called within the correct sequence.
VSS_E_OBJECT_NOT_FOUND	The specified volume or remote file share was not found or was not available.
VSS_E_UNEXPECTED	Unexpected error. The error code is logged in the error log file. For more information, see Event and Error Handling Under VSS. Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP: This value is not supported until Windows Server 2008 R2 and Windows 7. E_UNEXPECTED is used instead.

Remarks

Windows 7, Windows Server 2008 R2, Windows Vista, Windows Server 2008, Windows XP and Windows Server 2003: Remote file shares are not supported until Windows 8 and Windows Server 2012.

IsVolumeSupported will return TRUE if it is possible to create shadow copies on the given volume, even if the current configuration does not allow the creation of shadow copies on that volume at the present time.

For example, if the maximum number of shadow copies has been reached on a given volume (and therefore no more shadow copies can be created on that volume), the method will still indicate that the volume can be shadow copied.

Note For more information about the maximum number of shadow copies that can be created on a volume, see the entry for MaxShadowCopies in Registry Keys and Values for Backup and Restore.

This method cannot be called for a virtual hard disk (VHD) that is nested inside another VHD.

Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP: VHDs are not supported.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	vsbackup.h (include VsBackup.h, Vss.h, VsWriter.h)
Library	VssApi.lib