Re: Anyone??? (was Reproducible data corruption on 6.1-Stable)

Jonathan Stewart <jonathan@xxxxxxxxxx> wrote:
I set up a new server recently and transferred all the information from
my old server over. I tried to use unison to synchronize the backup of
pictures I have taken and noticed that a large number of pictures where
marked as changed on the server. After checking the pictures by hand I
confirmed that many of the pictures on the server were corrupted. I
attempted to use unison to update the files on the server with the
correct local copies but it would fail on almost all the files with the
message "destination updated during synchronization."

It appears the corruption happens during the read process because when I
recompare the files in a graphical diff tool between cache flushes the
differences move around!?!?!? The differences also appear to be very
small for the most part, single bytes scattered throughout the file. I
really have no idea what is causing the problem and would like to pin it
down so I can either replace hardware if it's bad or fix whatever the
bug is.

That very much sounds like bad RAM, or overclocked CPU
or bus. I assume you do not overclock, so I recommend
you replace your RAM modules and check if the symptoms
are gone.

Also check your BIOS settings for the RAM timings.
Setting the timings to more conservative values might
already solve the problem.

Best regards
Oliver

--
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd
Any opinions expressed in this message may be personal to the author
and may not necessarily reflect the opinions of secnetix in any way.

"Clear perl code is better than unclear awk code; but NOTHING
comes close to unclear perl code" (taken from comp.lang.awk FAQ)
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