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IVssDifferentialSoftwareSnapshotMgmt::ChangeDiffAreaMaximumSize method

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

pwszVolumeName [in]

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)
pwszDiffAreaVolumeName [in]

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)
llMaximumDiffSpace [in]

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.

ValueMeaning
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

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

VsMgmt.h

IID

IID_IVssDifferentialSoftwareSnapshotMgmt is defined as 214A0F28-B737-4026-B847-4F9E37D79529

See also

IVssDifferentialSoftwareSnapshotMgmt

 

 

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