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Diff Area Integrity

Updated: January 27, 2011

Applies To: Windows Server 2008

The Diff Area is the storage space that Shadow Copies of Shared Folders allocates on a volume for maintaining the snapshots of the contents of shared folders. A snapshot is a block-level set of information that represents the differences between the current content and content from a previous point in time. The integrity of existing and new snapshots depends on the integrity of the Diff Area.

Events

Event ID Source Message

1

VolSnap

The shadow copy of volume %2 could not create a diff area file on volume %3

2

VolSnap

The shadow copy of volume %2 could not be created because volume %3, which is specified as part of the diff area, is not an NTFS volume or an error was encountered while trying to determine the file system type of this volume.

3

VolSnap

The shadow copy of volume %2 could not lock down the location of the diff area file on volume %3.

14

VolSnap

The shadow copies of volume %2 were aborted because of an IO failure on volume %3.

16

VolSnap

The shadow copies of volume %2 were aborted because volume %3, which contains a diff area file for this shadow copy, was force dismounted

23

VolSnap

There was insufficient disk space on volume %3 to create the shadow copy of volume %2.  Diff area file creation failed.

24

VolSnap

There was insufficient disk space on volume %3 to grow the diff area for shadow copies of %2.  As a result of this failure all shadow copies of volume %2 are at risk of being deleted.

25

VolSnap

The shadow copies of volume %2 were aborted because the diff area file could not grow in time.  Consider reducing the IO load on this system to avoid this problem in the future.

33

VolSnap

The oldest shadow copy of volume %2 was deleted to keep disk space usage for shadow copies of volume %2 below the user defined limit.

35

VolSnap

The shadow copies of volume %2 were aborted because the diff area file failed to grow.

36

VolSnap

The shadow copies of volume %2 were aborted because the diff area file could not grow due to a user imposed limit.

38

VolSnap

There was a user imposed limit that prevented disk space on volume %3 from being used to grow the diff area for shadow copies of %2.  As a result of this failure all shadow copies of volume %2 are at risk of being deleted.

40

VolSnap

The shadow copies of volume %2 were aborted because volume %3 has been dismounted.

41

VolSnap

When preparing a new volume shadow copy for volume %2, the shadow copy storage on volume %3 did not have sufficiently large contiguous blocks.  Consider deleting unnecessary files on the shadow copy storage volume or use a different shadow copy storage volume

Related Management Information

Shadow Copies of Shared Folders

File Services

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