OpenVMS__SHADOW VAXSHAD01_070 VAX V7.0 Shadow Driver 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.

PRODUCT:    OpenVMS VAX

COMPONENT:  Volume Shadowing for OpenVMS  (Phase II)

SOURCE:     Digital Equipment Corporation

ECO INFORMATION:

     ECO Kit Name:  VAXSHAD01_070 
     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  234 Blocks
     Kit Applies To:  OpenVMS VAX V7.0
     System/Cluster Reboot Necessary:  Yes


ECO KIT SUMMARY:

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

  o  Attempts to start or restart copies may fail, usually after
     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 starting over from the beginning.

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

  o  If a DCD (Disk Copy Data) copy is interrupted by a mini-merge,
     the copy will restart at 0% copied (LBN 0) rather than continuing
     from where it left off.

  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 becomes "available".
     The source index is never acknowledged and the system remains
     with the set hanging 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. 

Colorado Site
Georgia Site

vaxshad01_070.README
vaxshad01_070.CHKSUM
vaxshad01_070.CVRLET_TXT
vaxshad01_070.a-dcx_vaxexe