Volume Snapshot Driver – Diff Area health issues

Details
Product: Windows Operating System
Event ID: 36
Source: VolSnap
Version: 5.2.3790.1830
Message: Volume Snapshot Driver – Diff Area health issues
   
Explanation

To maintain the consistency of shadow copies, the Volume Shadow Copy Service saves the original data to a shadow copy storage area (also referred to as a Diff Area). This event indicates that Volume Shadow Copy Service encountered an issue when writing to this area.

Cause

Possible causes include:

  • A disk I/O error occurred while performing the copy-on-write operation.
  • There is a bad block on the disk that contains the volume where the Diff Area is stored.
  • The Diff Area is not large enough to store the shadow copies.
  • The disk I/O or system load is so large that the Diff Area was not able increase in size fast enough.
   
User Action

Do one or more of the following:

  • Using chkdsk /r, check for errors on the volume where the Diff Area is stored and on the original volume,.
  • Check the system log in Event Viewer for errors associated with the volume where the Diff Area is stored or with the original volume.
  • Check for hardware errors on the disks that contain the volume where the Diff Area is stored and on the original volume.
  • Move the Diff Area to a different, dedicated volume.
  • Move the Diff Area to a larger volume.
  • Allocate more storage space for the Diff Area.
  • Increase the Diff Area initial size and growth rate by changing the MinDiffArea registry key.Caution: Incorrectly editing the registry may severely damage your system. Before making changes to the registry, you should back up any valued data on the computer.

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