Hyper-V Hosts VSS Error 8194

[JaxIsland7575]

I am running 3 clustered Hyper-V hosts with VBR 8 update 2. During the guest VMs backups the event logs on the hosts are filled with these errors:

Code: Select all

Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface.  hr = 0x80070005, Access is denied.
. This is often caused by incorrect security settings in either the writer or requestor process. 

Operation:
   Gathering Writer Data

Context:
   Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Name: System Writer
   Writer Instance ID: {c1e8de77-751a-45eb-8283-db928aed6a45}

Per Microsoft's Link I ran this:

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PS H:\> vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.

Writer name: 'Task Scheduler Writer'
   Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
   Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
   State: [1] Stable
   Last error: No error

Writer name: 'VSS Metadata Store Writer'
   Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
   Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
   State: [1] Stable
   Last error: No error

Writer name: 'Performance Counters Writer'
   Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
   Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
   State: [1] Stable
   Last error: No error

Writer name: 'System Writer'
   Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Instance Id: {c1e8de77-751a-45eb-8283-db928aed6a45}
   State: [1] Stable
   Last error: No error

Writer name: 'Cluster Shared Volume VSS Writer'
   Writer Id: {1072ae1c-e5a7-4ea1-9e4a-6f7964656570}
   Writer Instance Id: {f4957cf0-b184-4f7f-810b-5fea6efbdcd0}
   State: [1] Stable
   Last error: No error

Writer name: 'Microsoft Hyper-V VSS Writer'
   Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
   Writer Instance Id: {e6aa44f6-10c6-4c11-8f73-2bd156892a8a}
   State: [1] Stable
   Last error: No error

Writer name: 'SqlServerWriter'
   Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}
   Writer Instance Id: {8288ac49-b3be-40b0-8cdd-8a73b1d86681}
   State: [1] Stable
   Last error: No error

Writer name: 'ASR Writer'
   Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
   Writer Instance Id: {cd70b0b4-0988-4302-933f-aa6e116a24e7}
   State: [1] Stable
   Last error: No error

Writer name: 'Cluster Database'
   Writer Id: {41e12264-35d8-479b-8e5c-9b23d1dad37e}
   Writer Instance Id: {ba7358a0-9a19-4ab7-98a6-ce2748b9f633}
   State: [1] Stable
   Last error: No error

Writer name: 'Shadow Copy Optimization Writer'
   Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
   Writer Instance Id: {f02050c8-5915-46d3-9968-f62683edacab}
   State: [1] Stable
   Last error: No error

Writer name: 'Registry Writer'
   Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
   Writer Instance Id: {96f08cad-4239-4d49-a3d0-0939f32feb2e}
   State: [1] Stable
   Last error: No error

Writer name: 'COM+ REGDB Writer'
   Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
   Writer Instance Id: {83bc6990-8b6f-442d-ae09-b982d9984619}
   State: [1] Stable
   Last error: No error

Writer name: 'BITS Writer'
   Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0}
   Writer Instance Id: {98bbc68e-0053-47dc-aa68-cb17e966dd40}
   State: [1] Stable
   Last error: No error

Writer name: 'WMI Writer'
   Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
   Writer Instance Id: {4a85665e-b8e3-477d-b2e2-79a24cc3377f}
   State: [1] Stable
   Last error: No error

The article says to go back to the backup vendor if they are listed with no errors. Any idea on how I can resolve these errors?

[foggy]

Ryan, your best bet is to contact technical support with this. Quick forum search shows there could be different reasons causing this error, so logs review is required to define the actual cause in your case. Thanks.

[JaxIsland7575]

Yes that would be the best bet and I did contact them before posting except I forgot one thing, the case id in the original post! For reference it is: 01065491

Thanks foggy!