Kit Name:

     ALPMSCP01_071


Kits superseded by this kit:

     None


Kit Description:

     Version(s) of OpenVMS to which this kit may be applied:

     OpenVMS Alpha V7.1


     In order to receive the full fixes listed in this kit the following
     remedial kits also need to be installed:

     None


     Files patched or replaced:


      o  [SYS$LDR]TMSCP.EXE (new image)

      o  [SYS$LDR]MSCP.EXE (new image)



Problems addressed in ALPMSCP01_071 kit


      o  A Cache Data Lost error is detected in the tape  subsystem  due
         to  a  hardware related problem.  A GUS end message is returned
         to the client with an end message status of  08  (data  error).
         This  status  was  set  up in routine SEND_END in TMSCP.  Since
         this is not a valid status  for  a  GUS,  the  client  TUDRIVER
         rejects  the  invalid  status,  logs  an  error  and then calls
         TU$RE_SYNCH which breaks the connection.

         For the same Cache Data Lost error, if an AVAILABLE command  is
         issued,  the controller should return CDL until the host clears
         the condition in the controller.  TUDRIVER in the server,  upon
         receipt  of  an  end message for AVAILABLE which indicates CDL,
         will then issue another AVAILABLE with  the  clear  cache  data
         lost  modifier  set  in  the  packet.   The only status that is
         checked on the receipt of this end message is for  PRESE  which
         will return SS$_DATALOST.  Anything else returns SS$_DATALOST.

      o  System crash (INVEXCEPTN) when TMSCP does  not  get  a  message
         buffer  during  config  time  when a connection to MSCP$TAPE is
         broken.

                                                                Page 2


      o  An inconsistent transfer count when encountering a forced error
         on  a drive.  A drive directly attached (or HSx served) reports
         a different transfer count from the same drive served  via  the
         MSCP server.

         Code that attempts to determine the LBN of a forced error block
         by  looking  at  the byte count in the IOST/IOSB will arrive at
         different values on the same drive when  directly  accessed  or
         MSCP served.



Kit Installation Rating:

     The following kit  installation  rating,  based  upon  current  CLD
     information,  is provided to serve as a guide as to which customers
     should apply this remedial kit.  (Reference attached Disclaimer  of
     Warranty and Limitation of Liability Statement)

     INSTALLATION RATING:
        2 : To be installed by all customers using the following feature(s):

            Customers who are MSCP serving disks and tapes need to install
            this kit.


Installation Instructions:

     Install this kit with the VMSINSTAL utility  by  logging  into  the
     SYSTEM account, and typing the following at the DCL prompt:

         @SYS$UPDATE:VMSINSTAL ALPMSCP01_071 [location of the saveset]

     The saveset location may be a tape drive, or a disk directory  that
     contains the kit saveset.

     System should be rebooted after successful installation of the kit.
     If  you  have  other  nodes in your VMScluster, they should also be
     rebooted in order to make use of the new image(s).


     Copyright  (c)  Digital  Equipment  Corporation,  1997  All  Rights
     Reserved.   Unpublished rights reserved under the copyright laws of
     the United States.

     The software contained on this media is proprietary to and embodies
     the  confidential  technology  of  Digital  Equipment  Corporation.
     Possession, use, or dissemination of  the  software  and  media  is
     authorized  only  pursuant  to a valid written license from Digital
     Equipment Corporation.

     DISCLAIMER OF WARRANTY AND LIMITATION OF LIABILITY

     THIS PATCH IS PROVIDED AS IS, WITHOUT WARRANTY OF  ANY  KIND.   ALL
     EXPRESS  OR  IMPLIED  CONDITIONS,  REPRESENTATIONS  AND WARRANTIES,
     INCLUDING ANY IMPLIED  WARRANTY  OF  MERCHANTABILITY,  FITNESS  FOR
     PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED TO THE

                                                                Page 3


     EXTENT PERMITTED BY APPLICABLE LAW.  IN NO EVENT  WILL  DIGITAL  BE
     LIABLE  FOR  ANY  LOST REVENUE OR PROFIT, OR FOR SPECIAL, INDIRECT,
     CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER  CAUSED  AND
     REGARDLESS  OF  THE  THEORY OF LIABILITY, WITH RESPECT TO ANY PATCH
     MADE AVAILABLE HERE OR TO THE USE OF SUCH PATCH.