IMPORTANT NOTICE

Updated: 24-SEP-2003 (Use your browsers' Reload button to ensure you're viewing the most recent version)

To obtain this kit please call the Customer Support Centre or use the FTP site Search for this ECO kit and dependencies Search the Compaq FTP web site this kit (exact match) Search the Compaq FTP web site this or related ECOs

Copyright (c) Digital Equipment Corporation 1994. All rights reserved.

Modification Date:  14-NOV-2001
Modification Type:  Note added regarding this kit is no longer
                    available through SSB.

OP/SYS:     OpenVMS AXP

COMPONENT:  System

SOURCE:     Digital Customer Support Center

ECO INFORMATION:

     CSCPAT Kit:  CSCPAT_2009 V1.0  (CSCPAT_2009010)
     CSCPAT Kit Size:  594 blocks
     Engineering Cross Reference:  AXPCPUR02_010
     Kit Applies To:  OpenVMS AXP V1.0
     System Reboot Necessary:  Yes
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*                            NOTE                                     *
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*         THIS KIT IS NO LONGER AVAILABLE THROUGH SSB.                *
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ECO KIT SUMMARY:

An ECO kit exists for the DEC 3000 System on OpenVMS AXP V1.0.
This kit addresses the following problems:

  o  On DEC 3000 systems, on-disk data corruption may occur under
     the following conditions:

     -  A process is issuing multiple, asynchronous writes
        from user pages which are part of a global section;

     -  Asynchronously to the write operations, the process
        incurs page faults which may invalidate pages that
        were referenced in the queue, but were not yet
        ready to be processed as I/O requests;

     -  When the I/O requests get dequeued for processing,
        the DEC 3000 CPU specific code fails to detect
        that a user page mapping a page in the global
        section has become invalid.  This failure will cause
        another random page to be written to disk.

     Note that OpenVMS paging semantics allows for a  process page
     which is locked down for I/O to become invalid, as long as that
     process page maps a page of a global section.

     Typically, this failure is made evident by a process with a
     limited working set, issuing numerous asynchronous I/Os which
     involve global sections, and where in the act of issuing the
     I/Os, the process is sweeping memory (i.e., from one end of the
     global section to the other), incurring numerous page faults.


RELATED ARTICLES:

Detailed articles describing the problems listed above may exist in
the OPENVMS database. To view these articles, open the appropriate
product database and perform a query using either of the following
search strings: 'CSCPAT_2009' or 'AXPCPUR'.


ECO KIT ORDERING INSTRUCTIONS:

If after an evaluation you wish to obtain this kit, request it
electronically using the appropriate Advanced Electronic Services
(AES) Service Tool. If you are not familiar with how to request kits
electronically, open the DIA, WIS or DSNLINK database and review
the article entitled:

   [AES] How To Electronically Request ECO Kits Using Service Tools


INSTALLATION NOTES:

In order for the corrections in this kit to take effect, the system
must be rebooted.
  
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