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HP Tru64 UNIX Potential data consistency issues with ADVFS and DirectI/O
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TITLE: HP Tru64 UNIX Potential data consistency issues with ADVFS and DirectI/O
New Kit Date: 02-APR-2003
Modification Date: Not Applicable
Modification Type: NEW KIT
Copyright (c) Hewlett-Packard Company 2003. All rights reserved.
PRODUCT: HP Tru64 UNIX [R] 5.1
SOURCE: Hewlett-Packard Company
ECO INFORMATION:
ECO Name: T64V51B20-C0176000-17632-E-20030328
ECO Kit Approximate Size: 3.57MB
Kit Applies To: HP Tru64 UNIX 5.1 PK6 (BL20)
ECO Kit CHECKSUMS:
/usr/bin/sum results:
50085 3660
/usr/bin/cksum results:
1116287435 3747840
MD5 results:
7d6e9c84993d077f20ef7ef91d3c9eea
SHA1 results:
23fede60743d1e73895ddca9843b93fcd2e57714
ECO KIT SUMMARY:
A dupatch-based, Early Release Patch kit exists for HP Tru64 UNIX 5.1 that
contains solutions to the following problem(s):
The following data consistency problems may occur in HP Tru64 UNIX with
any application that uses ADVFS and direct I/O:
1. Potential for inconsistent data to be returned for threaded applications
performing AIO reads on a fragmented file via direct I/O, though
correct data is returned on subsequent reads. In addition, there is a
potential for an AIO read of a file opened for direct I/O to return an
incorrect number of bytes transferred. There is no actual on disk
corruption of the affected files.
2. Data loss may occur in files opened for direct I/O when writing in
increments smaller than 8K. This problem has been seen as an Oracle
process failure when running parallel query tests, with the following
error message:
"ORA-08103: OBJECT NO LONGER EXISTS error because a block in the datafile is
invalid."
3. Stale data may be returned to an application performing a read after a
copy-on-write operation on a clone fileset even though the correct data
is on the disk. With Oracle, this has been seen as a "ORA-600 [3020]
encountered during standby database recovery" error message.
These fixes are recommended by Oracle on their http://metalink.oracle.com
website for Oracle Server-Enterprise Edition versions 9.2, 9.0.1, and 8.1.7.
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 - HP Tru64 UNIX 5.1 Patch Kit 7.
INSTALLATION NOTES:
1) 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.
2) This ERP kit will NOT install over any Customer Specific Patches (CSPs)
which have file intersections with this ERP kit. Contact your normal
Service Provider for assistance if the installation of this ERP kit is
blocked by any of your installed CSPs.
INSTALLATION PREREQUISITES:
You must have installed HP Tru64 UNIX 5.1 PK6 (BL20) prior to installing
this Early Release Patch Kit.
SUPERSEDED PATCH LIST:
This patch kit supersedes the following Tru64 UNIX patch kit:
None.
KNOWN PROBLEMS WITH THE PATCH KIT:
None.
RELEASE NOTES FOR T64V51B20-C0176000-17632-E-20030328:
Release Notes
This document summarizes the contents and special instructions for the
Tru64 UNIX V5.1 patches contained in this kit.
For information about installing or removing patches, baselining,
and general patch management, see the Patch Kit Installation
Instructions document.
1 Release Notes
This Early Release Patch Kit Distribution contains:
- fixes that resolve the problem(s) reported in:
o TSTQG1TL9
* for Tru64 UNIX V5.1 T64V51B20AS0006-20030210.tar (BL20)
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 C1760.00
3 Summary of CSPatches contained in this kit
Tru64 UNIX V5.1
PatchId Summary Of Fix
----------------------------------------
C1760.00 Fix directIO stale data
4 Additional information from Engineering
None
5 Affected system files
This patch delivers the following files:
Tru64 UNIX V5.1
Patch C1760.00
./sys/BINARY/advfs.mod
CHECKSUM: 46517 1189
SUBSET: OSFADVFSBIN510
[R] UNIX is a registered trademark in the United States and other countries
licensed exclusively through X/Open Company Limited.
Copyright Hewlett-Packard Company 2003. All Rights reserved.
This software is proprietary to and embodies the confidential technology
of Hewlett-Packard Company. Possession, use, or copying of this
software and media is authorized only pursuant to a valid written license
from Hewlett-Packard or an authorized sublicensor.
This ECO has not been through an exhaustive field test process.
Due to the experimental stage of this ECO/workaround, Hewlett-Packard
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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Files on this server are as follows:
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»t64v51b20-c0176000-17632-e-20030328.README
»t64v51b20-c0176000-17632-e-20030328.CHKSUM
»t64v51b20-c0176000-17632-e-20030328.tar
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