Windows 2008/2008R2 clients fail to backup NAS filer data through a UNC CIFS share

Problem

Windows 2008/2008R2 clients fail to backup NAS filer data through a UNC CIFS share

Solution

Overview:
Although NetBackup fully supports backing up data through a CIFS share, it has been discovered that Windows 2008/2008R2 clients configured to backup data from a Network Appliance or an EMC filer via UNC path to a CIFS share hosted by the filer, results in a failure.


Troubleshooting:
In Activity Monitor, the job completes with Status 1.  Job Details reveal these messages:

10/23/2009 2:37:24 PM - Error bpbrm(pid=4128) from client HV2008-1: ERR - failure reading file: \\FILER\VOL0\home\myfile.txt (WIN32 87: The parameter is incorrect. )
the requested operation was partially successful(1)
The job was successfully completed, but some files may have been
busy or unaccessible. See the problems report or the client's logs for more details.


The client side bpbkar log shows these log lines for all files and folders affected by this:

9:05:40.543 AM: [1496.2788] <4> tar_base::V_vTarMsgW: INF - tar message received from dos_backup::tfs_readdata
9:05:40.543 AM: [1496.2788] <2> tar_base::V_vTarMsgW: ERR - failure reading file: \\FILER\VOL0\home\myfile.txt (WIN32 87: The parameter is incorrect. )



Details:
The issue stems from a change in Microsoft's BackupRead function on Windows 2008 when reading files and folders which are located on another computer that is not running Windows.

The function returns ERROR_NOT_SUPPORTED when reading portions of the metadata associated with the incoming files and folders.

NOTE: This issue is thus far known to exist only when using a Windows 2008 client to backup files housed on an NDMP NetApp device via CIFS share.
Windows 2008 can successfully backup files through CIFS shares when housed on other Windows OS's.

ETA of Fix:
Symantec has acknowledged that the above mentioned issue (Etrack 1854506) is present in the current version(s) of the product(s) mentioned at the end of this article. Symantec is committed to product quality and satisfied customers.
 
The fix for this issue is included in the following release:
  • NetBackup 7.0 Release Update 1 (7.0.1)
Information on this release is available at the following link:
 http://www.symantec.com/business/support/overview.jsp?pid=15143

Workarounds:
There are several workarounds which can be used to overcome this obstacle.

 
1.  In a single Master Server / Media Server environment where the Master Server is Windows 2008, purchase the NDMP Licensing Option and configure the Master/Media server to perform remote NDMP backups of the filer.
 

 
2.  In a single Master Server / Media Server environment where the Master Server is Windows 2008, it is possible to revert the OS to Windows 2003 and backup the data via UNC directly to the Master / Media Server as a Client.
 

 
3.  Configure a Windows 2003 NetBackup Client with a CIFS share to the NetApp.  The Windows 2003 NetBackup Client can then send its data to a NetBackup Media Server of any OS including Windows 2008.  
 

NOTE: The data stream will traverse the network two times - once from the NetApp to the Client, and then from the Client to the Media Server.

 
4.  Install and configure a Windows 2003 Media Server as a NetBackup Client. Configure a policy for the Media Server Client that will back up the UNC path to the NetApp device.
 

NOTE: The data stream will traverse the network one time - from the NetApp to the Media Server.


If none of these workarounds are feasible, please open a case with Technical Support to see if a hotfix is available.

 

Terms of use for this information are found in Legal Notices.

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