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snapshot error encountered(156) on SQL server (Open file backup question)

Created: 19 Dec 2012 • Updated: 18 Mar 2013 | 3 comments
This issue has been solved. See solution.

I received the following error on one of my SQL servers, but the SQL admin is using lightspeed to backup the logs. I turned off Open file backup and the error went away. Is there any reason if I didn't need to restore the database that I should be worried about doing this?

Hostname: 0085ctwksp01
Policy: Database-Servers-2
Policy type: MS-Windows
NB Client: 7.0
NB Master Server 7.0
Error: snapshot error encountered(156)

12/19/2012 1:04:47 AM - estimated 14852252 Kbytes needed
12/19/2012 1:04:48 AM - started process bpbrm (4968)
12/19/2012 1:04:56 AM - connecting
12/19/2012 1:05:00 AM - connected; connect time: 00:00:04
12/19/2012 1:05:04 AM - begin writing
12/19/2012 1:21:51 AM - Error bpbrm(pid=4968) from client 00085ctwksp01: ERR - failure reading file: I:\CI\Installs\EXT020_3\Publisher\Stage\QVD\ObTrans_2012.qvd (WIN32 2: The system cannot find the file specified. )
12/19/2012 1:21:52 AM - Error bpbrm(pid=4968) from client 00085ctwksp01: ERR - Snapshot Error while reading file: GLOBALROOT\Device\HarddiskVolumeShadowCopy166\CI\Installs\EXT020_3\Publisher\Stage\QVD\ObTrans_2012.qvd 
12/19/2012 1:21:53 AM - Critical bpbrm(pid=4968) from client 00085ctwksp01: FTL - Backup operation aborted!    
12/19/2012 1:21:57 AM - Error bpbrm(pid=4968) could not send server status message      
12/19/2012 1:22:00 AM - end writing; write time: 00:16:56
snapshot error encountered(156)

Firstly, if Open file backups are not desired for the client, disable them. This will decrease the resources used by the client during backup and resolve any Status 156 errors. The default NetBackup install options are to have open file backups enabled.
To confirm if VSS or VSP open file backups are activated:
1. Within the NetBackup Administration Console, expand Host Properties in the right hand pane
2. Within Host Properties, click Master Server and then the double-click the name of the Master Server in the right pane
3. Click on the Client Attributes section
4. If the client in question is listed here, click on the client name. If it is not listed, add and click on the client name.
5. Click the Windows Open File Backup tab
6. Ensure that Enable Windows Open File Backups for this client is not selected if open file backups are not required

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RamNagalla's picture


when your SQL DBA is using the  lightspeed, just make sure that you have the proper exclude list for all unnecessory files..

you does not neeed to worry about the DB files directyly... but you may need to take the backup of files that are created by lightspeed.(depends on your requirement)

 MS-Windows backup is required in case of OS recover and other then DB files, if you trun off the open file backup, you might not have the all data avaliable under the backup images.

so i would suggest you to find and fix this issue rather than disabling it.

Marianne's picture

As from NBU 7, VSS is used by default.

If you disable Open File backups, you will probably see status 1 exit codes. Skipped files will be listed in Job Details.

Best to send list of skipped files to server owner and verify the need for those files in case of restore request.

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