About Me

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TsooRad is a blog for John Weber. John was a Skype for Business MVP (2015-2018) - before that, a Lync Server MVP (2010-2014). My day job is titled "Technical Lead, MS UC" - I work with an awesome group of people at CDW, LLC. I focus on collaboration and infrastructure. This means Exchange of all flavors, Skype, LCS/OCS/Lync, Windows, business process, and learning new stuff. I have a variety of interests - some of which may rear their ugly head in this forum. I have a variety of certifications dating back to Novell CNE and working up through the Microsoft MCP stack to MCITP multiple times. FWIW, I am on my third career - ex-USMC, retired US Army. I have a fancy MBA. One of these days, I intend to start teaching. The opinions expressed on this blog are mine and mine alone.


2008 R2 Hyper-V WBadmin failure


2008R2 Hyper-V Host.

C: is system only. 

D: is hyper-v system files and VM VHD’s

Doing a complete server scheduled Windows Backup fails:  "The backup operation that started at '‎2010‎-‎02‎-‎13T06:21:44.876000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '2155348001'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

Drive C: backed up from command line just fine:

wbadmin start backup -backuptarget:\\network\share -include:c: -allcritical -quiet

Drive D: (288 GB of VM VHD) fails even from command line.


Read this and then do the following.

Open an elevated command prompt and do “vssadmin list writers”

In my case this is the result (and it matches the reference CSS advice). Remember that the CSS advice is to double-check this value as yours MAY be different.

Writer name: 'Microsoft Hyper-V VSS Writer'
   Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
   Writer Instance Id: {7df567b8-ed9f-4383-ae86-0489c9569cc2}
   State: [5] Waiting for completion
   Last error: Unexpected error


  1. hklm\software\microsoft\windowsNT\currentversion\spp
  2. Add a new key as type reg_Multi_SZ
  3. Name for new key: DisabledWriters
  4. Value for new key: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de} (remember that yours may be different - run a vssadmin list writers to determine your value for the key)
  5. net stop wbengine
  6. net start wbengine

My windows backup immediately worked properly, backing up over 280GB of active VM VHD’s.


Markyp said...

Awesome buddy, just saved me many more hours

tsoorad said...

Glad I helped.

nagidi said...

You are the best!

nagidi said...

Thank you!
You are the best!

Der HOrner said...

Well I already spent a few hours but u saved me from many more... big big thank you from austria :)

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