From: Valdis.Kletnieks@vt.edu
To: Stephan von Krawczynski <skraw@ithnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Undo aic7xxx changes (now rc7+aic20030603)
Date: Tue, 24 Jun 2003 22:22:44 -0400 [thread overview]
Message-ID: <200306250222.h5P2MiM9019201@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Tue, 24 Jun 2003 23:26:09 +0200." <20030624232609.5887c159.skraw@ithnet.com>
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On Tue, 24 Jun 2003 23:26:09 +0200, Stephan von Krawczynski said:
> sorry, you probably misunderstood my flaky explanation. What I meant was not
a
> cached block from the _tape_ (obviously indeed a char-type device) but from t
he
> 3ware disk (i.e. the other side of the verification). Consider the tape
> completely working, but the disk data corrupt (possibly not from real reading
> but from corrupted cache).
Don't rule out odder explanations either. True story follows.. ;)
I once had the misfortune of being the admin for a Gould PN/9080. UTX/32 1.2
came out, and since it changed the inode format on disk, it's dump/mkfs/restore
time. So I take the last 3 full backups, and do 2 more complete dumps besides.
I checked, and *NO* I/O errors had been reported (and then I checked THAT by
giving it a known bad tape and seeing errors WERE reported).
Do the upgrade... and *every single* tape was 'not in dump/restore format'.
Finally traced it down (this was the days when oscilloscopes were still useful)
to a bad 7400 series chip on the tape controller. The backplane was a 32-bit
bus, the tape was an 8-bit device - so there was a 4-to-1 mux that had a bad
chip. Bit 3 would be correct for 4 bits, inverted for 4 bits, correct for
4, etc.. Tape drive *NEVER* complained, because what came over the *cable*
was correct, parity and all..
Oh, and I got the data back something like this:
cat > mangle.c
main() {
int muck[2];
while (read(0,muck,8) == 8) {
muck[1] ^= 0x20202020;
write(1,muck,8);
}
}
^D
cc -o mangle mangle.c
dd if=/dev/rmt0 bs=32k | ./mangle | restore -f -
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next prev parent reply other threads:[~2003-06-25 2:08 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 20:22 Undo aic7xxx changes Marcelo Tosatti
2003-05-09 0:45 ` Justin T. Gibbs
2003-05-09 10:06 ` Stephan von Krawczynski
2003-05-09 12:06 ` Willy Tarreau
2003-05-09 13:02 ` Stephan von Krawczynski
2003-05-09 13:27 ` Willy Tarreau
2003-05-09 13:46 ` Stephan von Krawczynski
2003-05-09 14:56 ` Willy Tarreau
2003-05-09 15:08 ` Arjan van de Ven
2003-05-09 16:27 ` Willy Tarreau
2003-05-09 15:18 ` Andreas Schwab
2003-05-09 15:19 ` William Lee Irwin III
2003-05-09 14:11 ` Stephan von Krawczynski
2003-05-09 14:57 ` Willy Tarreau
2003-05-12 9:02 ` Stephan von Krawczynski
2003-05-12 15:43 ` Marc-Christian Petersen
2003-05-12 17:25 ` Willy Tarreau
2003-05-23 10:38 ` Stephan von Krawczynski
2003-05-23 12:58 ` Justin T. Gibbs
2003-05-23 13:11 ` Stephan von Krawczynski
2003-05-23 19:57 ` Willy Tarreau
2003-05-24 10:52 ` Stephan von Krawczynski
2003-05-24 11:16 ` Willy Tarreau
2003-05-25 10:58 ` Stephan von Krawczynski
2003-05-25 12:35 ` Willy TARREAU
2003-05-25 12:47 ` Marc-Christian Petersen
2003-05-25 13:50 ` Stephan von Krawczynski
2003-05-25 14:01 ` Marc-Christian Petersen
2003-05-25 14:03 ` Geller Sandor
2003-05-26 15:00 ` Stephan von Krawczynski
2003-05-26 16:44 ` Willy Tarreau
2003-05-30 8:09 ` Stephan von Krawczynski
2003-05-30 8:19 ` Marc-Christian Petersen
2003-05-30 8:21 ` Arjan van de Ven
2003-05-30 8:51 ` Stephan von Krawczynski
2003-05-30 13:34 ` Jeff Garzik
2003-05-30 13:59 ` Stephan von Krawczynski
2003-05-30 13:35 ` Jeff Garzik
2003-05-25 18:30 ` Justin T. Gibbs
2003-06-05 15:05 ` Undo aic7xxx changes (now rc7+aic20030603) Stephan von Krawczynski
2003-06-05 18:14 ` Willy Tarreau
2003-06-06 8:17 ` Oleg Drokin
2003-06-06 9:04 ` Stephan von Krawczynski
2003-06-06 9:17 ` Oleg Drokin
2003-06-06 15:24 ` short freezing while file re-creation Stephan von Krawczynski
2003-06-06 16:02 ` Oleg Drokin
2003-06-06 19:00 ` Chris Mason
2003-06-06 19:10 ` Oleg Drokin
2003-06-06 19:20 ` Chris Mason
2003-06-08 10:15 ` Undo aic7xxx changes (now rc7+aic20030603) Stephan von Krawczynski
2003-06-08 11:19 ` Stephan von Krawczynski
2003-06-08 11:49 ` Stephan von Krawczynski
2003-06-08 16:07 ` Stephan von Krawczynski
2003-06-09 15:10 ` Stephan von Krawczynski
2003-06-09 15:32 ` Justin T. Gibbs
2003-06-10 10:23 ` Stephan von Krawczynski
2003-06-10 15:38 ` Justin T. Gibbs
2003-06-10 17:11 ` Stephan von Krawczynski
2003-06-10 18:07 ` Justin T. Gibbs
2003-06-11 0:51 ` Stephan von Krawczynski
2003-06-11 4:39 ` Justin T. Gibbs
2003-06-11 20:23 ` Stephan von Krawczynski
2003-06-11 21:01 ` John Stoffel
2003-06-13 9:45 ` Stephan von Krawczynski
2003-06-15 12:56 ` Stephan von Krawczynski
2003-06-15 13:26 ` John Stoffel
2003-06-17 20:47 ` Marcelo Tosatti
2003-06-18 11:05 ` Stephan von Krawczynski
2003-06-18 14:21 ` John Stoffel
2003-06-18 14:54 ` Stephan von Krawczynski
2003-06-20 19:59 ` Marcelo Tosatti
2003-06-20 20:59 ` Kevin P. Fleming
2003-06-20 21:13 ` Marcelo Tosatti
2003-06-20 22:03 ` Willy Tarreau
2003-06-20 23:48 ` Stephan von Krawczynski
2003-06-21 10:50 ` Willy TARREAU
2003-06-22 19:00 ` Stephan von Krawczynski
2003-06-23 11:30 ` Stephan von Krawczynski
2003-06-24 11:11 ` Stephan von Krawczynski
2003-06-24 17:43 ` Willy Tarreau
2003-06-24 21:26 ` Stephan von Krawczynski
2003-06-24 22:03 ` Willy Tarreau
2003-06-24 23:43 ` Stephan von Krawczynski
2003-06-25 19:16 ` Willy Tarreau
2003-06-25 19:42 ` Stephan von Krawczynski
2003-06-25 20:30 ` John Stoffel
2003-06-26 9:36 ` Stephan von Krawczynski
2003-06-26 11:34 ` Stephan von Krawczynski
2003-06-30 10:10 ` Stephan von Krawczynski
2003-06-30 11:39 ` Marcelo Tosatti
2003-06-30 12:08 ` Stephan von Krawczynski
2003-06-25 23:04 ` Bernd Eckenfels
2003-06-25 2:22 ` Valdis.Kletnieks [this message]
2003-06-24 18:31 ` Bill Davidsen
2003-06-12 13:54 ` Stephan von Krawczynski
2003-06-10 1:38 ` Zwane Mwaikambo
2003-06-10 10:30 ` Stephan von Krawczynski
2003-06-10 12:51 ` Zwane Mwaikambo
2003-06-10 13:38 ` Stephan von Krawczynski
2003-06-10 13:51 ` Zwane Mwaikambo
2003-06-10 15:55 ` Stephan von Krawczynski
2003-06-10 16:23 ` Oleg Drokin
2003-06-10 17:44 ` Stephan von Krawczynski
2003-06-10 18:15 ` Zwane Mwaikambo
2003-06-10 23:55 ` Stephan von Krawczynski
2003-06-10 18:20 ` Zwane Mwaikambo
2003-05-23 18:30 ` Undo aic7xxx changes Marcelo Tosatti
2003-05-23 19:25 ` Stephan von Krawczynski
[not found] <20030507203025$6f60@gated-at.bofh.it>
[not found] ` <20030509005011$6cee@gated-at.bofh.it>
[not found] ` <20030509101012$732a@gated-at.bofh.it>
[not found] ` <20030509122007$758f@gated-at.bofh.it>
[not found] ` <20030509131009$00f3@gated-at.bofh.it>
[not found] ` <20030611045008$03cf@gated-at.bofh.it>
[not found] ` <20030611203031$12de@gated-at.bofh.it>
[not found] ` <20030611211012$34cf@gated-at.bofh.it>
[not found] ` <20030613095017$1680@gated-at.bofh.it>
[not found] ` <20030617210022$3e37@gated-at.bofh.it>
[not found] ` <20030618111010$154f@gated-at.bofh.it>
2003-06-18 12:46 ` Undo aic7xxx changes (now rc7+aic20030603) Pascal Schmidt
2003-06-18 12:49 ` Stephan von Krawczynski
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