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* *
* This is a newly released patch... *
* *
* Online links can be found at *
* http://ftp.support.compaq.com/patches/public/unix/v5.1/t64v51b19-c0125200-14321-e-20020516.README
*******************************************************************************

TITLE: Tru64 UNIX directIO inconsistent data fix
 
New Kit Date: 23-MAY-2002
Modification Date: Not Applicable
Modification Type: Net Kit

Copyright (c) Compaq Computer Corporation 2002. All rights reserved.

PRODUCT: Tru64 UNIX [R] 5.1
SOURCE: Compaq Computer Corporation

ECO INFORMATION:

     ECO Name: T64V51B19-C0125200-14321-E-20020516.tar
     ECO Kit Approximate Size: 2.5MB
     Kit Applies To: Tru64 UNIX 5.1 PK5 (BL19)

     ECO Kit CHECKSUMS:
        /usr/bin/sum results:
        64009 2520

        /usr/bin/cksum results:
        2193034021 2580480

        MD5 results:
        c06edea1da56b4c1bd50550f4b161393

        SHA1 results:
        b9f79b6027cb535a8110c4561cfd07b5489b55c8

ECO KIT SUMMARY:

A dupatch-based, Early Release Patch kit exists for Tru64 UNIX 5.1 that
contains solutions to the following problem(s):

  When a file is opened in an AdvFS filesystem for directIO, and
  there are several concurrent writers to the same AdvFS page (writes
  must be < 8k in size or not page-aligned), and the underlying AdvFS
  page is already in the UBC cache, the updates are not correctly
  serialized and one or more of the updates may be lost. This patch
  fixes this condition.

  On Tru64 UNIX V5.1 there is a potential loss of updated data in files
  opened for directIO when writing in increments smaller than 8k.

The Patch Kit Installation Instructions and the Patch Summary and Release
Notes documents provide patch kit installation and removal instructions
and a summary of each patch. Please read these documents prior to
installing patches on your system.

The patches in this ERP kit will also be available in the next mainstream
patch kit - Tru64 UNIX 5.1 Patch Kit 6.

INSTALLATION NOTES:

Install this kit with the dupatch utility that is included in the patch
kit. You may need to baseline your system if you have manually changed
system files on your system. The dupatch utility provides the baselining
capability.

INSTALLATION PREREQUISITES:

You must have installed Tru64 UNIX 5.1 PK5 (BL19) prior to installing
this Early Release Patch Kit.

KNOWN PROBLEMS WITH THE PATCH KIT:

None.

RELEASE NOTES FOR T64V51B19-C0125200-14321-E-20020516.tar:

1 Release Notes

This Early Release Patch Kit Distribution contains:

   - fixes that resolve the problem(s) reported in:
        o 93376 BCGM50847
             * for Tru64 UNIX V5.1 T64V51B19AS0005-20020325.tar (BL19)
             * for Tru64 UNIX V5.1 T64V51B19AS0005-20020411.tar (BL19)

 The patches in this kit are being released early for general customer use.
 Refer to the Release Notes for a summary of each patch and installation
 prerequisites.

 Patches in this kit are installed by running dupatch from the directory

 in which the kit was untarred. For example, as root on the target system:

> mkdir -p /tmp/CSPkit1
> cd /tmp/CSPkit1
> <copy the kit to /tmp/CSPkit1>
> tar -xpvf DUV40D13-C0044900-1285-20000328.tar
> cd patch_kit
> ./dupatch

2 Special Instructions

There are no special instructions for Tru64 UNIX V5.1 Patch C1252.00

3 Summary of CSPatches contained in this kit

Tru64 UNIX V5.1

PatchId Summary Of Fix
----------------------------------------
C1252.00 Fix directIO pwrite/pread inconsistent data

4 Additional information from Engineering

None

5 Affected system files
This patch delivers the following files:

Tru64 UNIX V5.1
        Patch C1252.00
                ./sys/BINARY/advfs.mod
                        CHECKSUM: 50806 1184
                        SUBSET: OSFADVFSBIN510

[R] UNIX is a registered trademark in the United States and other countries
licensed exclusively through X/Open Company Limited.

Copyright Compaq Computer Corporation 2002. All Rights reserved.

  This software is proprietary to and embodies the confidential technology
  of Compaq Computer Corporation. Possession, use, or copying of this
  software and media is authorized only pursuant to a valid written license
  from Compaq or an authorized sublicensor.

       This ECO has not been through an exhaustive field test process.
       Due to the experimental stage of this ECO/workaround, Compaq
       makes no representations regarding its use or performance. The
       customer shall have the sole responsibility for adequate protection
       and back-up data used in conjunction with this ECO/workaround.

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