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IVssDifferentialSoftwareSnapshotMgmt::ChangeDiffAreaMaximumSize method (vsmgmt.h)

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The ChangeDiffAreaMaximumSize method updates the shadow copy storage area maximum size for a certain volume. This may not have an immediate effect.

Syntax

HRESULT ChangeDiffAreaMaximumSize(
  [in] VSS_PWSZ pwszVolumeName,
  [in] VSS_PWSZ pwszDiffAreaVolumeName,
  [in] LONGLONG llMaximumDiffSpace
);

Parameters

[in] pwszVolumeName

Name of the volume that is the source of shadow copies. This volume is associated with a shadow copy storage area on the pwszDiffAreaVolumeName volume.

The name of the volume 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)

[in] pwszDiffAreaVolumeName

Name of the volume that contains the shadow copy storage area associated with the pwszVolumeName volume.

The name of the volume must be in one of the following formats and must include a trailing backslash (\):

  • The path of a mounted folder
  • A drive letter, for example, D:\
  • A volume GUID path of the form \\?\Volume{GUID}\ (where GUID identifies the volume)

[in] llMaximumDiffSpace

Specifies the maximum size, in bytes, for the shadow copy storage area to use for the volume. If this value is zero, the shadow copy storage area will be deleted. If this value is –1, the maximum size is unlimited.

Return value

This method can return one of these values.

Value Meaning
S_OK
 Successfully changed the shadow copy storage area maximum size.
E_ACCESSDENIED
 Caller does not have sufficient backup privileges or is not an administrator.
E_INVALIDARG
 One of the parameter values is not valid.
E_OUTOFMEMORY
 The caller is out of memory or other system resources.
VSS_E_INSUFFICIENT_STORAGE
 The pwszDiffAreaVolumeName volume does not have sufficient free space.
VSS_E_OBJECT_NOT_FOUND
 The association between the pwszVolumeName and pwszDiffAreaVolumeName volumes was not found.
VSS_E_PROVIDER_VETO
 Provider error - the provider logged the error in the event log. For more information, see Event and Error Handling Under VSS.
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.
VSS_E_VOLUME_IN_USE
 A shadow copy is currently using the shadow copy storage area.

Remarks

The ChangeDiffAreaMaximumSize method makes the shadow copy storage area explicit, which means that it is not deleted automatically when all shadow copies are deleted.

If the shadow copy storage area does not exist, this method creates it.

Windows Server 2008, Windows Vista and Windows Server 2003:  If the shadow copy storage area does not exist, this method does not create it.

To create a shadow copy storage area, use the IVssDifferentialSoftwareSnapshotMgmt::AddDiffArea method.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header vsmgmt.h

See also

IVssDifferentialSoftwareSnapshotMgmt