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Running a dir \\view\someviewname reports error: The mounted file system does not support extended attributes



This technote identifies an error, The mounted file system does not support extended attributes, that can occur when running a dir \\view\someviewname when using IBM Rational ClearCase.


Running a dir \\view\someviewname reports an error:

"The mounted file system does not support extended attributes"


This issue has been identified as a product defect under APAR IC63847.


This issue has been seen in Microsoft Windows Windows 7, Vista SP2 and Windows 2008 SP2.

You do not see this behavior when running Windows 2008 Service Pack 1.

Prior to an upgrade to Windows 2008 Service Pack 2, it was possible to get a listing when running a dir of \\view\someviewname for a remote view.

Resolving The Problem

Defect APAR IC63847 has been resolved in ClearCase, and


  • To workaround the issue, use the mapped MVFS drive or a mapped view drive and run dir.
  • OR

  • Disable DFS


    This solution contains information about modifying the system registry. Before making any modifications to the Microsoft Registry Editor, it is strongly recommended that you make a backup of the existing registry. For more information describing how to back up the registry, refer to Microsoft Knowledge Base article 256986

    In the windows registry, create or set a DWORD value called DisableDfs . The value needs to be set as 1 in HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Mup

    Note: Contact Microsoft for further information about disabling DFS.

    You must reboot the machine for this value to take effect.

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Document Information

Modified date:
29 September 2018