Assume that you enable FILESTREAM feature in Microsoft SQL Server 2014 and create a FILESTREAM container on a storage volume. If you bring the instance of SQL Server and the storage volume offline, the FILESTREAM driver (RsFx driver) is unexpectedly detached from the volume. You can use the fltmc instances command to check this state of the RsFx driver.
This issue may occur in the following scenario:
You use the third-party product VERITAS Storage Foundation to manage the storage volume of a Windows failover cluster.
The FILESTEAM data resides on the storage volume.
After you bring the storage volume online in this scenario, the FILESTREAM data is inaccessible. For example, you can't access the Windows share of the FILESTREAM data by using the Universal Naming Convention (UNC) path in File Manager.
Cumulative update information
The issue was first fixed in the following cumulative update of SQL Server 2014:
Recommendation: Install the latest cumulative update for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server 2014:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.