09/24/96,
 
  Mksysb 8mm Tape Block Size Recovery
 
 
 
  SPECIAL NOTICES
 
       Information in this document is correct to the best of our
       knowledge at the time of this writing.  Please send feedback
       by fax to "AIXServ Information" at (512) 823-4009.
 
       Please use this information with care.  IBM will not be
       responsible for damages of any kind resulting from its use.
       The use of this information is the sole responsibility of
       the customer and depends on the customer's ability to eval-
       uate and integrate this information into the customer's
       operational environment.
 
       +----------------------------------------------------------+
       |                                                          |
       | NOTE:  The information in this document has NOT been     |
       | verified for AIX 4.1.                                    |
       |                                                          |
       +----------------------------------------------------------+
 
 
  ABOUT THIS DOCUMENT
 
       This document is a workaround for the 8mm tape block size
       problem.  The problem is usually found when the user tries
       to install from 8mm system image backup tapes.  This proce-
       dure applies to AIX 3.1 and 3.2.
 
  SUPPLIES:
 
       o   Install/Maintenance diskette of the correct level
 
       o   Enough temporary space to restore the
           Install/Maintenance diskette
 
  STEPS:
 
       You must be logged on as the root user when you perform
       these steps.
 
       1.  Create a temporary directory for restoring the
           Install/Maintenance diskette.  You can replace "temp" in
           the command below with whatever you wish to call the
           directory.
 
           mkdir temp
 
       2.  Change your current working directory to the temporary
           directory.  (Replace temp with the name you gave the
           directory.)
 
           cd temp
 
       3.  Restore the Install/Maintenance diskette.
 
           restore -xvq
 
                                  Mksysb 8mm Tape Block Size Recovery  1
 
 
                                                               09/24/96,
 
       4.  Edit the file called startup2.
 
           Search for the string "512".  You should find the line
           in the file which says, "Make sure that all tape devices
           are at 512."  A couple of lines later, there is a chdev
           command which sets the block_size to 512.  Change the
           512 to 1024 or whatever your block_size was when you
           made the system backup.
 
           Save your changes and exit the editor.
 
       5.  Re-create the diskette with the following command, typed
           from the directory where the diskette was restored.
 
           find . -print | backup -ivqp
 
       6.  Reboot from the bosboot diskette that you just modified.
           You should now be able to use the system backup tape,
           provided that the change to the diskette was made cor-
           rectly.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                  Mksysb 8mm Tape Block Size Recovery  2
 
 
                                                               09/24/96,
 
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  END OF DOCUMENT (mksysb.1024.bak)
 
 
 
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