OpenVMS__SHADOW ALPSHAD01_070 Alpha V7.0 Volume Shadowing 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) Digital Equipment Corporation 1996.  All rights reserved.

          ********************  WARNING!  ********************
          *                                                  *
          *  Engineering has discovered a problem with this  *
          *  ECO kit and has requested that it be placed on  *
          *  hold.  They are currently researching the       *
          *  problem.                                        *
          *                                                  *
          ****************************************************

PRODUCT:    Volume Shadowing for OpenVMS  (Phase II)

OP/SYS:     OpenVMS Alpha V7.0

COMPONENT:  Shadow Driver 
            Bugcheck

SOURCE:     Digital Equipment Corporation

ECO INFORMATION:

     ECO Kit Name:  ALPSHAD01_070
     ECO Kits Superseded by This ECO Kit:  None.  
     ECO Kit Approximate Size:  882 Blocks
     Kit Applies To:  OpenVMS Alpha V7.0
     System/Cluster Reboot Necessary:  Yes


ECO KIT SUMMARY:

An ECO kit exists for Volume Shadowing on OpenVMS Alpha V7.0.  
This kit addresses the following problems: 

  o  Failures occur during attempts to start copies or restart
     copies, usually after a node halt, shutdown or reboot.
     Additional symptoms observed include inconsistent values for
     HBS_CIP when compared to SHADOW_MAX_COPY, negative values for
     HBS_CIP and copies that should continue start over from the
     beginning.

  o  If a DCD copy is interrupted by a mini-merge, the copy will
     restart at 0% copied (LBN 0) rather than continuing from where
     it left off.  DCD copies should restart at the last copied LBN
     after it was interrupted by mini-merge.

  o  System hangs may occur when I/Os pending to a shadow set do
     not complete.

  o   A two member shadowset with member index 0 a copy target and
      index 1 the only source member experiences a node failure on a
      node serving the disks.  The source member goes "available".
      The source index is never packacked and the system remains with
      the set hung in mount verification forever.

  o   UCB$L_MAXBCNT is not set up for system disks before the first
      writes are enabled for that device.  The attempt to issue a
      write without having this field initialized results in a
      SHADDETINCON bug check.


INSTALLATION NOTES:

In order for the corrections in this kit to take effect, the system
must be rebooted.  If the system is a member of a VMScluster, the 
entire cluster should be rebooted. 

alpshad01_070.README
alpshad01_070.CHKSUM
alpshad01_070.a-dcx_axpexe
alpshad01_070.CVRLET_CVRLET_TXT