we have a problem with one of our clients. The problem is related to a VM with 3 disks, 1 for the OS with 200GB and the other 2 for the data with 8TB and 13TB. Veeam 9.5 SP2 is installed on the host. The host is Windows Server 2012 R2 and the guest the same. It backups on a QNAP. No iscsi installed.
The problem is that 9/10 the backup failes with these errors:
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03/08/2017 13:21:47 :: Failed to create snapshot (Microsoft Software Shadow Copy provider 1.0) (mode: Veeam application-aware processing) Details: Writer 'Microsoft Hyper-V VSS Writer' is failed at 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT'.
The writer experienced a non-transient error. If the backup process is retried,
the error is likely to reoccur.
--tr:Failed to verify writers state.
--tr:Failed to perform pre-backup tasks.
03/08/2017 13:22:23 :: Retrying snapshot creation attempt (Writer 'Microsoft Hyper-V VSS Writer' is failed at 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT'.
The writer experienced a non-transient error. If the backup process is retried,
the error is likely to reoccur.
--tr:Failed to verify writers state.
--tr:Failed to perform pre-backup tasks.)
03/08/2017 13:22:25 :: Unable to allocate processing resources. Error: Writer 'Microsoft Hyper-V VSS Writer' is failed at 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT'.
The writer experienced a non-transient error. If the backup process is retried,
the error is likely to reoccur.
--tr:Failed to verify writers state.
--tr:Failed to perform pre-backup tasks.
In the guest there are these VSS errors:
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VSS Error 12293
Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {74600e39-7dc5-4567-a03b-f091d6c7b092}. Routine details PostFinalCommitSnapshots({f8ddc176-c71a-4aa7-8307-6b7efac0c6be}, 4) [hr = 0x80070002, The system cannot find the file specified.
].
Operation:
Executing Asynchronous Operation
Context:
Current State: DoSnapshotSet
Volsnap Error 16
The shadow copies of volume \\?...67-11e7-80cf-00155d01a201} were aborted because volume \\?...67-11e7-80cf-00155d01a201}, which contains shadow copy storage for this shadow copy, was force dismounted.
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Error Code 8229
A VSS writer has rejected an event with error 0x800423f4, The writer experienced a non-transient error. If the backup process is retried,
the error is likely to reoccur.
. Changes that the writer made to the writer components while handling the event will not be available to the requester. Check the event log for related events from the application hosting the VSS writer.
Operation:
PrepareForSnapshot Event
Context:
Execution Context: Writer
Writer Class Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
Writer Name: Microsoft Hyper-V VSS Writer
Writer Instance ID: {39a658c2-1b5d-4a0f-9364-3402e5439f8c}
Command Line: C:\Windows\system32\vmms.exe
Process ID: 2840
My support case id is : 02266075
Thanks