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| Title: | dec_mls_plus |
|
| Moderator: | SMURF::BAT |
|
| Created: | Mon Nov 29 1993 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 534 |
| Total number of notes: | 2544 |
479.0. "new-wire-method broken" by SMURF::BAT (Segui la tua beatitudine) Wed Apr 16 1997 18:32
Date: Wed, 16 Apr 1997 15:52:11 -0400 (EDT)
From: John Donovan USG <[email protected]>
To: "blitz.dis" <[email protected]>, [email protected],
[email protected], [email protected],
Dianna Ellis UNIX Presales <[email protected]>,
[email protected], [email protected],
[email protected], [email protected],
Allan Malcolm USG <[email protected]>, [email protected],
[email protected], Neil Davies <[email protected]>,
USEG Problem Management -- Brian Axtell <[email protected]>,
Henry Bone <[email protected]>, Ronald Uberti <[email protected]>,
Tom Hayden <[email protected]>, [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
Cc: Patricia Czerny USG <[email protected]>, Jane Lawler <[email protected]>,
Kent Ferson <[email protected]>,
Sarah Tappan USG <[email protected]>,
Shashi Mangalat USG <[email protected]>,
Joe Kenny USG <[email protected]>, John Donovan <[email protected]>
Message-Id: <[email protected]>
Mime-Version: 1.0
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Sender: owner-bbw
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Reply-To: John Donovan USG <[email protected]>
TO: blitz.dis
CC: czerny, lawler, ferson, tappan, shashi, kenny, me
+---------------------------+TM
| | | | | | | |
| d | i | g | i | t | a | l | TIME DEPENDENT BLITZ
| | | | | | | |
+---------------------------+
BLITZ TITLE: DIGITAL UNIX DATA CORRUPTION WITH SHARED MEMORY
DATE: 16 April 1997
AUTHOR: John Donovan TD #:
DTN: 381-1344
ENET: guru::donovan CROSS REFERENCE #'s:
DEPARTMENT: UNIX Support Engineering (PRISM/TIME/CLD#'s)
INTENDED AUDIENCE: All PRIORITY LEVEL: 1
(U.S./EUROPE/GIA) (1=TIME CRITICAL,
2=NON-TIME CRITICAL)
=====================================================================
INTRODUCTION:
During the course of prereleased hardware testing with Digital UNIX
Versions 4.0 and later, the Digital UNIX Engineering Group discovered
a user application data corruption that was not detected by the
operating system software.
PROBLEM:
A data corruption problem can occur when the parameter new-wire-method
is turned on. The new-wire-method parameter is only available in V4.0
and later releases. All versions V4.0 and later ship with the default
being new-wire-method enabled.
RESOLUTION/WORKAROUND:
The workaround for this problem is as follows:
The problem can be eliminated by turning off the new-wire-method.
1) Become the root user.
2) Create a new file named /tmp/nwm and insert the following lines:
vm:
new-wire-method=0
3) Execute the sysconfigdb command as follows:
# /sbin/sysconfigdb -f /tmp/nwm -m vm
4) Reboot the system.
The new-wire-method option is now disabled.
Please note that turning off the new-wire-method should cause
little or no performance degradation.
It is the Strong Recommendation of Digital UNIX Engineering that
this workaround be implemented on all systems running Digital UNIX
V4.0 and above. Failure to do so can result in undetected data
corruption.
ADDITIONAL COMMENTS:
Digital UNIX Engineering is working at the highest priority on a
solution that will not require the above workaround. When the
resultant fix is ready, an advisory blitz will announce its
availability.
*** DIGITAL INTERNAL USE ONLY ***
\\ GRP=TIME_DEPENDENT CAT=HARDWARE DB=CSSE_TIME_CRITICAL
\\ TYPE=KNOWN_PROBLEM TYPE=BLITZ STATUS=CURRENT
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