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Copy Paste file transfers slow only on 10g connected NICs

    Question

  • Have a network copy performance problem.    Two servers running either 2008R2 or Server 2012 connected at 10g have extremely slow copy performance when using the Windows GUI to copy.  Robocopy performs as expected.

    The problem does not occur with 1gb NICS.   1gb NIC file copy performance when using the GUI is actually multiple times faster than the 10g connected NICS.

    Have already disabled TCP chimney, IPv4 Large Send offloading, disabled smb 2.0 as a test, RSS etc.

    Tuesday, April 23, 2013 7:15 PM

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