Enum VssVolumeSnapshotAttributes

Allows additional attributes to be specified for a shadow copy. The context of a shadow copy (as set by the SetContext method in IVssBackupComponents method) may be modified by a bitmask that contains a valid combination of VssVolumeSnapshotAttributes and VssSnapshotContext enumeration values.

Namespace: Alphaleonis.Win32.Vss

Assembly: AlphaVSS.Common.dll

Syntax

[Flags]
public enum VssVolumeSnapshotAttributes

Remarks

In the VSS API, these values are represented by the enumeration VssSnapshotContext

Fields

Name	Description
AutoRecover	Indicates that the writer will need to auto-recover the component in `CVssWriter::OnPostSnapshot`. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
ClientAccessible	The specified shadow copy is a client-accessible copy, supports Shadow Copies for Shared Folders, and should not be exposed. This attribute is automatically set for `ClientAccessible` and `ClientAccessibleWriters`. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
DelayedPostSnapshot	Reserved for system use. Windows Vista, Windows Server 2003, and Windows XP: This value is not supported until Windows Server 2008.
Differential	Indicates that a given provider uses differential data or a copy-on-write mechanism to implement shadow copies. A requester can modify a shadow copy context with a bitwise OR of this attribute. By doing this, the requester instructs providers to create a shadow copy using a differential implementation. If no shadow copy provider installed on the system supports the requested attributes, a VssVolumeNotSupportedException error will be returned to AddToSnapshotSet(String, Guid).
ExposedLocally	The shadow copy is locally exposed. If this bit flag and the `ExposedRemotely` bit flag are not set, the shadow copy is hidden. The attribute is automatically added to a shadow copy context upon calling the ExposeSnapshot(Guid, String, VssVolumeSnapshotAttributes, String) method to expose a shadow copy locally. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
ExposedRemotely	The shadow copy is remotely exposed. If this bit flag and the `ExposedLocally` bit flag are not set, the shadow copy is hidden. The attribute is automatically added to a shadow copy context upon calling the ExposeSnapshot(Guid, String, VssVolumeSnapshotAttributes, String) method to expose a shadow copy locally. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
HardwareAssisted	Indicates that a given provider is a hardware-based provider. This attribute is automatically set for hardware-based providers. This enumeration value cannot be used to manually set the context (using the SetContext(VssVolumeSnapshotAttributes) method) of a shadow copy by a bit mask (or bitwise OR) of this enumeration value and a valid shadow copy context value from VssSnapshotContext.
Imported	The shadow copy of the volume was imported onto this machine using the ImportSnapshots() method rather than created using the DoSnapshotSet() method. This attribute is automatically set if a shadow copy is imported. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
NoAutoRecovery	Auto-recovery is disabled for the shadow copy. A requester can modify a shadow copy context with a bitwise OR of this attribute. By doing this, the requester instructs VSS to make the shadow copy read-only immediately after it is created, without allowing writers or other applications to update components in the shadow copy. Disabling auto-recovery can cause the shadow copy to be in an inconsistent state if any of its components are involved in transactional database operations, such as transactional read and write operations managed by Transactional NTFS (TxF). This is because disabling auto-recovery prevents incomplete transactions from being rolled back. Disabling auto-recovery also prevents writers from excluding files from the shadow copy. Windows Server 2003 and Windows XP: This value is not supported until Windows Vista.
NoAutoRelease	The shadow copy is not automatically deleted when the shadow copy requester process ends. The shadow copy can be deleted only by a call to DeleteSnapshot(Guid, Boolean) or DeleteSnapshotSet(Guid, Boolean). This attribute is automatically set for VssSnapshotContext contexts of `Rollback`, `ClientAccessible`, `ClientAccessibleWriters` and `Rollback`.
NotSurfaced	The shadow copy is not currently exposed. Unless the shadow copy is explicitly exposed or mounted, this attribute is set for all shadow copies. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
NotTransacted	The shadow copy is not transacted. A requester can modify a shadow copy context with a bitwise OR of this attribute. By doing this, the requester instructs VSS to disable built-in integration between VSS and transaction and resource managers. Setting this attribute guarantees that the requester will not receive VssTransactionFreezeTimeoutException errors. However, it may cause unwanted consequences, such as the loss of transactional integrity or even data loss. Windows Server 2003 and Windows XP: This value is not supported until Windows Vista.
NoWriters	No writers are involved in creating the shadow copy. This attribute is automatically set for VssSnapshotContext contexts of `NasRollback`, `FileShareBackup` and `ClientAccessible`. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
Persistent	The shadow copy is persistent across reboots. This attribute is automatically set for VssSnapshotContext contexts of `AppRollback` `ClientAccessible`, `ClientAccessibleWriters` and `NasRollback`. This attribute should not be used explicitly by requesters when setting the context of a shadow copy.
Plex	Indicates that a given provider uses a PLEX or mirrored split mechanism to implement shadow copies. A requester can modify a shadow copy context with a bitwise OR of this attribute. By doing this, the requester instructs the providers to create a shadow copy using a PLEX implementation. If no shadow copy provider installed on the system supports the requested attributes, a VssVolumeNotSupportedException error will be returned to AddToSnapshotSet(String, Guid).
RollbackRecovery	Indicates that the writer will need to auto-recover the component in `CVssWriter::OnPostSnapshot` if the shadow copy is being used for rollback (for data mining, for example). A requester would set this flag in the shadow copy context to indicate that the shadow copy is being created for a non-backup purpose such as data mining.
Transportable	The shadow copy is to be transported and therefore should not be surfaced locally. This attribute can be used explicitly by requesters when setting the context of a shadow copy, if the provider for shadow copy supports transportable shadow copies. Windows Server 2003, Standard Edition, Windows Server 2003, Web Edition, and Windows XP: This attribute is not supported. All editions of Windows Server 2003 SP1 support this attribute.
TxFRecovery	Indicates that TxF recovery should be enforced during shadow copy creation. Windows Vista, Windows Server 2003, and Windows XP: This value is not supported until Windows Server 2008.