FIX: Storage device overhead when you back up data or log files to a network share in SQL Server 2014 or 2012

Applies to: SQL Server 2014 DeveloperSQL Server 2014 DeveloperSQL Server 2014 Enterprise


When you back up a database or a database log to a network share Universal Naming Convention (UNC) path in Microsoft SQL Server 2014 or Microsoft SQL Server 2012, the network storage device indicates that SQL Server searches for the filestream.hdr file in its parent directories. This generates some unexpected overhead on certain storage devices.


This issue occurs because SQL Server checks for the filestream.hdr file to prevent a file from being backed up to a FILESTREAM container. However, this is generally unnecessary for a network share.


Cumulative update information

This fix relaxes the check for a UNC path.

The issue was first fixed in the following cumulative update of SQL Server:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.