57069: Acronis Backup Advanced 11.7/11.5: Single-Pass Backup of Multiple SQL Databases Fails with "Unknown Win32 error"

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  1. You have an SQL server with a large amount of databases.
  2. You back up the server with single-pass backup.
  3. Backup fails with:

Failed to start creating the volume snapshot.
Error: 0x10C442
$module = "ArsDbBackupProvider64_vsa64_44299"
Tag: 0x14181C22EF45B17C

VSS writer 'SqlServerWriter' with class ID 'A65FAA63-5EA8-4EBC-9DBD-A0C4DB26912A' has failed to process the snapshot.
Error: 0x10C469
$module = "ArsDbBackupProvider64_vsa64_44299"
Tag: 0x14181C22EF45AA27

Unknown Win32 error
Error: 0xFFF0
code = 2147754996 (0x800423F4),
$module = "ArsDbBackupProvider64_vsa64_44299"

Windows event logs contain the following errors:

"Sqllib error: OLEDB Error encountered calling ICommandText::Execute. hr = 0x80040e14. SQLSTATE: 42000, Native Error: 3013
Error state: 1, Severity: 16
Source: Microsoft SQL Server Native Client 11.0
Error message: BACKUP DATABASE is terminating abnormally.
SQLSTATE: 42000, Native Error: 3202
Error state: 1, Severity: 16
Source: Microsoft SQL Server Native Client 11.0
Error message: Write on ""{56EFEAC3-AC01-4E93-86B8-D24E27241B1D}33"" failed: 995(The I/O operation has been aborted because of either a thread exit or an application request.)"

"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.
   PrepareForSnapshot Event
   Execution Context: Writer
   Writer Class Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}
   Writer Name: SqlServerWriter
   Writer Instance Name: Microsoft SQL Server 2014:SQLWriter
   Writer Instance ID: {3a6cb2be-ba9b-4259-9a73-59d16eff7f93}
   Command Line: ""C:\Program Files\Microsoft SQL Server\90\Shared\sqlwriter.exe""
   Process ID: 1980"


Increase the Max Worker Threads on your SQL Server. Select your version of SQL server and follow instructions of this MSDN article.