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Barracuda Backup

How to Check Volume Shadow Copy Services Driver State

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If you encounter errors during backup initialization of Microsoft Server 2008 or 2008 R2, or Small Business Server (SBS) 2011, you may have misconfigured or disabled Volume Shadow Copy Services (VSS) drivers. Microsoft provides a command-line tool to verify the state of the VSS writers. To utilize this tool, open a command prompt on the Windows Server, and enter:  vssadmin list writers

Following is an example using this tool to check driver status:

C:\>vssadmin list writers

vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool (C) Copyright 2001 Microsoft Corp. 

Writer name: 'System Writer'

Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}

Writer Instance Id: {449e12cf-6b8f-4d75-a821-bc869d6612c4}

State: [1] Failed

Last error: No error

 

Writer name: 'SqlServerWriter'

Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}

Writer Instance Id: {de3b2861-77f6-43f8-8619-64dc9ea2fbcf}

State: [1] Stable

Last error: No error

 

Writer name: 'MSDEWriter'

Writer Id: {f8544ac1-0611-4fa5-b04b-f7ee00b03277}

Writer Instance Id: {9036fdfa-05ef-4f7d-9c2f-84fa2f06560a}

State: [1] Stable

Last error: No error

 

Writer name: 'WMI Writer'

Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}

Writer Instance Id: {f9f92826-a3d4-486c-ade3-a4201deb8ad2}

State: [7] Failed

Last error: No error


If the output of this command contains writers with a state that is not Stable, you must restart the VSS service Volume Shadow Copy Services. If you continue to see this error in reports and agent logs even after restarting the services, register your VSS drivers use the following instructions:

If you determine that restarting Services is appropriate for your environment, complete the following steps:

  1. Log in to the system, and click Start.
  2. Enter services.msc in the Start Search box, and press Enter.
  3. In the Services window, right-click each of the following services individually, and then click Restart:
    • COM+ Event System
    • Volume Shadow Copy
  4. Close the Services window.
  5. Open an elevated command prompt, enter:
    vssadmin list writers
  6. Press Enter.
  7. Verify that the VSS writers are listed.

If you continue to experience problems with your VSS drivers in relation to your Barracuda Backup Server, contact Barracuda Networks Technical Support.

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