VSS_PROTECTION_LEVEL enumeration (vsmgmt.h)

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Defines the set of volume shadow copy protection levels.

Syntax

typedef enum _VSS_PROTECTION_LEVEL {
  VSS_PROTECTION_LEVEL_ORIGINAL_VOLUME = 0,
  VSS_PROTECTION_LEVEL_SNAPSHOT
} VSS_PROTECTION_LEVEL, *PVSS_PROTECTION_LEVEL;

Constants

 
VSS_PROTECTION_LEVEL_ORIGINAL_VOLUME
Value: 0
Specifies that I/O to the original volume must be maintained at the expense of shadow copies. This is the default protection level. Shadow copies might be deleted if both of the following conditions occur:


  • A write to the original volume occurs.

  • The integrity of the shadow copy cannot be maintained for some reason, such as a failure to write to the shadow copy storage area or a failure to allocate sufficient memory.
VSS_PROTECTION_LEVEL_SNAPSHOT
Specifies that shadow copies must be maintained at the expense of I/O to the original volume. This protection level is called "shadow copy protection mode." All I/O to the original volume will fail if both of the following conditions occur:


  • A write to the original volume occurs.

  • The corresponding write to the shadow copy storage area cannot be completed for some reason, such as a failure to write to the shadow copy storage area or a failure to allocate sufficient memory.

Remarks

When a volume is in shadow copy protection mode, requesters must set shadow copy storage area (diff area) associations using the IVssDifferentialSoftwareSnapshotMgmt::AddDiffArea method.

Requirements

Requirement Value
Minimum supported client Windows Vista with SP1 [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header vsmgmt.h

See also

IVssDifferentialSoftwareSnapshotMgmt3

IVssDifferentialSoftwareSnapshotMgmt3::GetVolumeProtectLevel

IVssDifferentialSoftwareSnapshotMgmt3::SetVolumeProtectLevel

VSS_PROTECTION_FAULT

VSS_VOLUME_PROTECTION_INFO