IBM Support

Windows Fatal Application Exit error accessing ClearCase VOBs with SaMBa



IBM® Rational® ClearCase® users have difficulty accessing elements in a SaMBa™ environment using Microsoft® Windows® views and UNIX® or Linux® VOBs resulting in Fatal Application Exit errors on Windows.


The following error may be printed on the client desktop:

Windows – Fatal Application Exit
mvfs: ERROR: view=<viewtag> vob=<vobtag> - ClearCase vob error
see view_log on host <view-host> for more info

The following types of errors may also appear in the view_log on the view server:

05/03/04 11:33:06 view_server(3184): Error: view_server.exe(3184): Error: Unable to construct cleartext for object "0xA16A" in VOB "": error detected by ClearCase subsystem

05/03/04 11:33:06 view_server(3184): Error: view_server.exe(3184): Error: Type manager "text_file_delta" failed construct_version operation.

05/03/04 11:33:06 view_server(3184): Warning: text_file_delta: Error: Unable to open file "\\\vobs\myvob.vbs\s
/sdft\17/f/0-61614bfee27841349bf7ad2e50eb5487-y1": Invalid argument


This problem can occur if:

  1. The information in the SaMBa username map file, samba.conf, is incorrect, or if SaMBa is configured to point to the wrong username map file or Samba's MAX_OPEN_FILES parameter may be set too low.


  2. The Windows client's MVFS Maximum Mnode settings are incorrect.

Resolving The Problem

Check the following:

1. Login to the SaMBa SWAT tool and make sure the correct username map file, samba.conf, is specified. Then, check the username map file to make sure all entries are correct. Consult your SaMBa man pages for assistance where required.

If the MAX_OPEN_FILES parameter are too low, use Samba's SWAT administration tool to reset the MAX_OPEN_FILES parameter to a higher value. This parameter can be accessed with the Globals > Advanced View. Check if this resolves the problem.

2. If there are no problems with the username map file, make sure that the MVFS Mnodes settings are correct for use with SaMBa.

To do this, open the Windows Control panel and click the ClearCase > MVFS Performance tab > Mnodes section. The settings of interest are:

  • Maximum number of Mnodes to keep on the VOB free list
  • Maximum number of Mnodes to keep on the cleartext free list

    Note: You will need to check Override to modify the value.

  • 3. The required Mnode settings are specific to the SaMBa installation:

  • For 32-bit mode Samba installations, these Mnode values are both required to be set to 200
  • For 64-bit mode Samba installations, these Mnode values are both required to be set to 800

    Note: The above settings are only for the Maximum Mnode values, and you do not need to adjust the Minimum Mnode values with respect to this issue.

  • The default MVFS cache sizes scale automatically based on host memory and are appropriate for a wide range of client needs. Refer to Examining and Adjusting MVFS Cache Size in the IBM Rational ClearCase Administration Guide for more details on the MVFS cache and what the general considerations are for adjusting them.


    Hardcopy can be ordered from the IBM Publications Center

    On-line documentation can be found:

  • HTML

  • 7.0:
  • On-line ClearCase version 7.0 documentation

  • Distributed Documentation:
  • C:\Program Files\Rational\ClearCase\doc\books

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    Document Information

    Modified date:
    16 June 2018