Date: Tue, 16 May 1995 07:26:33 -0400 (EDT) From: Peter Dufault <dufault@hda.com> To: y0001415@ws.rz.tu-bs.de (Martin Butkus) Cc: freebsd-bugs@FreeBSD.org Subject: Re: big files written to scsi harddisk got corrupted Message-ID: <199505161126.HAA24513@hda.com> In-Reply-To: <199505161010.DAA05529@freefall.cdrom.com> from "Martin Butkus" at May 16, 95 12:10:37 pm
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Martin Butkus writes: > > Hello. > > I think I have discovered a bug in the february SNAP of FreeBSD. After a > vanilla install, I did > > yes > test.dat > > in an xterm and killed yes when test.dat had a size of 100MB or so. When I > looked at the file I found that sometimes characters got replaced by 0xff's. > If such a corruption happens, it always happens to 8 consecutive characters. > When I tried to determine at which position in the file such a corruption > occurs, I found that the positions (in bytes) are always divisible by 2048. > I then ktrace'd the I/O of yes and there were no errors in the ktrace log file. > I enabled SCSI debugging too and the error level returned from the drive was > always 0x0 (no error). I have checked cables and termination but this had > no effect on the bug. The problem could be found on my Quantum drive as well > as on the Syquest. I presume this is a bug in FreeBSD as the drive is > new and the controller is known to have worked flawlessly in another machine. > In case you need it here is my configuration: > > intel 486/50 > 16 MB RAM > Quantum lightning 730S rev 241E hard disk > Syquest 270MB removable disk (currently not installed) > Adaptec 1542 A SCSI controller (I use its floppy disk controller, too) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is suspect in the newer kernels, perhaps due to better clustering and bigger I/O transfers. Marc Ramirez was kind enough to send me a 1542A, but I won't have a system to plug it into (with full length slots) until later this week. Peter -- Peter Dufault Real Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267
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