ECO NUMBER:     VMS72_PORTS-V0100
             PRODUCT:        OpenVMS Alpha OPERATING SYSTEM 7.2
             UPDATE PRODUCT: OpenVMS Alpha OPERATING SYSTEM 7.2




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1  KIT NAME:

     VMS72_PORTS-V0100


2  KITS SUPERSEDED BY THIS KIT:

     None.


3  KIT DEPENDENCIES:

     3.1  The  following  remedial  kit(s)  must  be  installed   BEFORE
          installation of this, or any required kit:

     DEC-AXPVMS-VMS72_UPDATE-V0100--4.PCSI


     3.2  In order to receive all the corrections listed  in  this  kit,
          the following remedial kits should also be installed:

     None.


4  KIT DESCRIPTION:

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

     OpenVMS Alpha V7.2


     4.2  Files patched or replaced:


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



5  PROBLEMS ADDRESSED IN VMS72_PORTS-V0100 KIT


      o  The cluster-related problems that can occur are:

         1.  SYS$SCS   FAST_PATH   RSPID   =   0:    "STALE   READ/WRITE
             DATA-CORRUPTION"  or SYS$DUDRIVER cancel-related INVEXCEPTN
             bugcheck

             Incorrect SYS$SCS FAST_PATH  Response-ID  (RSPID)  handling
             results  in  1)  RSPID=0  and  2)  a  "stale"  CDRP  in the
             Response-Descriptor-Table (SCS$GL_RDT) index-0.   RDT-scans
             on   DU-connection-failover   or  DU-I/O  "CANCELing"  will
             attempt to process the "stale" CDRP,  with  either  of  the
             following results:

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              -  SYS$DUDRIVER/DUTU$CANCEL      (or      DUTU$END_CANCEL)
                 INVEXCEPTN bugchecks or

              -  DATA-CORRUPTION due to re-issuing MSCP-I/O  on  "stale"
                 CDRP


         2.  SCAN_RDT STALE-CDRP "RSPID" verification to avoid potential
             DATA-CORRUPTION from "STALE" CDRPs

             If  an  SCS  system   application   (DUDRIVER)   fails   to
             de-allocate an "RSPID", a "stale" CDRP pointer will be left
             in the  RDT.   A  check  is  added  for  "stale"  CDRPs  on
             RDT-scans,  to  avoid  data  corruption  due  to unintended
             reprocessing of a recycled CDRP.


         Images(s) affected:

          -  [SYS$LDR]SYS$SCS.EXE




6  KIT INSTALLATION RATING:

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

     INSTALLATION RATING:

       INSTALL_2 : To  be  installed  by   all  customers  using  the  following
           feature(s):

           OpenVMS Alpha Clusters



7  INSTALLATION INSTRUCTIONS:

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

     PRODUCT INSTALL VMS72_PORTS /SOURCE=[location of Kit]

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

     Additional help on installing PCSI kits can be found by typing
     HELP PRODUCT INSTALL at the system prompt


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     The images in this kit will not take effect  until  the  system  is
     rebooted.

     If you have other nodes in your OpenVMS cluster, they must also  be
     rebooted  in  order  to make use of the new image(s).  If it is not
     possible or convenient to reboot the entire cluster at this time, a
     rolling re-boot may be performed.


     Copyright  (c)  Compaq  Computer  Corporation,  1999   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  Compaq  Computer  Corporation.
     Possession, use, or dissemination of  the  software  and  media  is
     authorized  only  pursuant  to  a valid written license from Compaq
     Computer 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
     EXTENT PERMITTED BY APPLICABLE LAW.  IN NO  EVENT  WILL  COMPAQ  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.