SetFileIOOverlappedRange Error AFTER Installing SQL Server 2008 R2 SP2 / Win 2679255 / T8903

SQL Server 2008 R2 - 64 Bit

Version: 10.5.4260 (SP2 CU1)

OS: Windows Server 2008 R2 Enterprise 64 bit SP1 With Hotfix 2679255 installed

SQL Server Trace flag 8903 enabled

In the environment described above, we are sometimes experiencing the following error when restoring databases from backup:

SetFileIoOverlappedRange failed, GetLastError is 1314

Per blogs, forum posts, etc. (see the bottom of this post), I was under the impression that this error is fixed with SQL Server 2008 R2 in conjunction with Windows hotfix 2679255 and SQL Server Trace flag 8903. Yet this error still occurs.

Has anyone else seen this error AFTER updating to SP2 / T8903 / 2679255?

I realize that we can work around the issue by turning off T8903, but I'd still like to understand why this isn't working- seems like we have everything we need in place.

Any help appreciated!

Thanks,

Vince

Background posts:

http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/74d2eaaa-cbcf-4870-9d99-e9b052805c2d

http://blogs.msdn.com/b/psssql/archive/2012/03/20/setfileiooverlappedrange-can-lead-to-unexpected-behavior-for-sql-server-2008-r2-or-sql-server-2012-denali.aspx