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| Title: | dec_mls_plus |
|
| Moderator: | SMURF::BAT |
|
| Created: | Mon Nov 29 1993 |
| Last Modified: | Fri Jun 06 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 21:32
Date: Wed, 16 Apr 1997 15:52:11 -0400 (EDT)
From: John Donovan USG <donovan@zk3.dec.com>
To: "blitz.dis" <boren@bss.enet.dec.com>, comstock@helix.enet.dec.com,
csc-contacts@guru.zk3.dec.com, DAVE.SPILLANE@reo.mts.dec.com,
Dianna Ellis UNIX Presales <dianna@zk3.dec.com>,
dominic@neasys.enet.dec.com, keilty@rhett.ENET.dec.com,
kenyon@asimov.enet.dec.com, lemire@mse1.enet.dec.com,
Allan Malcolm USG <malcolm@zk3.dec.com>, martin@decatl.enet.dec.com,
mgreenfield@hydra.enet.dec.com, Neil Davies <ndavies@zk3.dec.com>,
USEG Problem Management -- Brian Axtell <axtell@zk3.dec.com>,
Henry Bone <bone@zk3.dec.com>, Ronald Uberti <uberti@zk3.dec.com>,
Tom Hayden <hayden@zk3.dec.com>, safford@mse1.enet.dec.com,
tasar@amcucs.enet.dec.com, TECH_INFO@CSSE.enet.dec.com,
TIMA_MGR@tima.ENET.dec.com, useg@kamlia.zk3.dec.com,
usg@kamlia.zk3.dec.com
Cc: Patricia Czerny USG <czerny@zk3.dec.com>, Jane Lawler <lawler@zk3.dec.com>,
Kent Ferson <ferson@zk3.dec.com>,
Sarah Tappan USG <tappan@zk3.dec.com>,
Shashi Mangalat USG <shashi@zk3.dec.com>,
Joe Kenny USG <kenny@zk3.dec.com>, John Donovan <donovan@zk3.dec.com>
Message-Id: <Pine.OSF.3.95.970416154332.30186I-100000@kamlia.zk3.dec.com>
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Reply-To: John Donovan USG <donovan@zk3.dec.com>
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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