OpenVMS VMS72_PORTS-V0100 Alpha V7.2 SCS ECO Summary

TITLE: OpenVMS VMS72_PORTS-V0100 Alpha V7.2 SCS ECO Summary
 
NOTE:  An OpenVMS saveset or PCSI installation file is stored
       on the Internet in a self-expanding compressed file.
       The name of the compressed file will be kit_name-dcx_vaxexe
       for OpenVMS VAX or kit_name-dcx_axpexe for OpenVMS Alpha.
 
       Once the file is copied to your system, it can be expanded
       by typing RUN compressed_file.  The resultant file will
       be the OpenVMS saveset or PCSI installation file which
       can be used to install the ECO.
 

Copyright (c) Compaq Computer Corporation 1999.  All rights reserved.

Modification Date:  10-AUG-1999
Modification Type:  New Kit


PRODUCT:    OpenVMS Alpha

COMPONENT:  SYS$SCS.EXE (Cluster, DUDRIVER)

SOURCE:     Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name:  VMS72_PORTS-V0100
                    DEC-AXPVMS-VMS72_PORTS-V0100--4.PCSI

     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  180 Blocks
     Kit Applies To:  OpenVMS Alpha V7.2
     System/Cluster Reboot Necessary:  Yes
     Rolling Re-boot Supported:  Yes
     Installation Rating:  INSTALL_2 - To be installed on all systems running
                                       the listed version(s) of OpenVMS and
                                       using the following feature(s):

                                            OpenVMS Alpha Clusters
     Kit Dependencies:

       The following remedial kit(s) must be installed BEFORE
       installation of this kit:

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

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

         None 


ECO KIT SUMMARY:

An ECO kit exists for SYS$SCS on OpenVMS Alpha V7.2.  This kit addresses
the following problems: 

Problems Addressed in the VMS72_PORTS-V0100 Kit:

  o  FAST_PATH RSPID=0 and "stale" CDRP in SCS$GL_RDT, SYS$DUDRIVER
     INVEXCEPTN 

     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: 

            -  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


INSTALLATION NOTES:

The images in this kit will not take effect until the system is
rebooted.  If there are other nodes in the VMScluster, 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.


All trademarks are the property of their respective owners.

dec-axpvms-vms72_ports-v0100--4.README
dec-axpvms-vms72_ports-v0100--4.CHKSUM
dec-axpvms-vms72_ports-v0100--4.pcsi-dcx_axpexe
vms72_ports-v0100.CVRLET_TXT