From owner-freebsd-questions Wed Nov 26 12:00:06 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id MAA14769 for questions-outgoing; Wed, 26 Nov 1997 12:00:06 -0800 (PST) (envelope-from owner-freebsd-questions) Received: from wall.jhs.no_domain (vector.muc.ditec.de [194.120.126.35]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id LAA14724 for ; Wed, 26 Nov 1997 11:59:59 -0800 (PST) (envelope-from jhs@flip.jhs.no_domain) Received: from flip.jhs.no_domain (localhost [127.0.0.1]) by flip.jhs.no_domain (8.8.5/8.8.5) with ESMTP id QAA05254 for ; Wed, 26 Nov 1997 16:34:01 +0100 (MET) Message-Id: <199711261534.QAA05254@flip.jhs.no_domain> Date: Wed, 26 Nov 1997 15:34:00 +0000 From: "Julian H. Stacey" Subject: Re: bytes gets substituted on write To: undisclosed-recipients:; Sender: owner-freebsd-questions@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk ------- Blind-Carbon-Copy To: Leif Neland cc: tomppa@fidata.fi, fabio@cesar.unicamp.br, gcrutchr@nightflight.com, j@uriah.heep.sax.de, jc@irbs.com, julian@freebsd.org, kuku@gilberto.physik.rwth-aachen.de, nikm@ixa.net, wilko@yedi.iaf.nl, Greg Lehey , "Julian H. Stacey" , scsi@FreeBSD.ORG Subject: Re: bytes gets substituted on write From: "Julian H. Stacey" Reply-To: "Julian H. Stacey" X-Address: Holz Strasse 27d, 80469 Munich, Germany X-Web: http://www.freebsd.org/~jhs/ (including PGP key) X-Tel: +49.89.268616 X-Fax: +49.89.2608126 X-Data: +49.89.26023276 X-Company: Vector Systems Ltd, Unix & Internet Consultants X-Mailer: EXMH-1.6.9 + FreeBSD-2.2.2 (Unix) In-reply-to: Your message of "Wed, 26 Nov 1997 13:10:32 +1030." <19971126131032.61824@lemis.com> Date: Wed, 26 Nov 1997 15:34:00 +0000 Sender: jhs@flip.jhs.no_domain [ Moved from (but bcc'd to) freebsd-questions@FreeBSD.ORG ] Reference: > From: Greg Lehey > Date: Wed, 26 Nov 1997 13:10:32 +1030 > Message-id: <19971126131032.61824@lemis.com> Greg Lehey wrote: > On Wed, Nov 26, 1997 at 01:06:04AM +0100, Leif Neland wrote: > > Here I go again: > > > > When copying a large file, suddenly 8 bytes in a row gets substituted > > with 0xff! > > When I repeat the copy, it's the same 8 bytes. > > Where are they in the block? > > > It also happens, when I either use ftp on this machine to get a file > > or use ftp on another to put the file. > > System: 486dx33Mhz, 8MB ram, Old Adaptec, 4 scsi's, the one with fbsd > > is a maxtor "scsi-0". > > Would the controller be a 154[02]A? People have seen this before. I > can't recall, but I seem to think that 8 bytes is about the reconnect > length for the controller. Are they located on 8-byte boundaries? > > Try tweaking your controller parameters. I don't know if this would > help, but it could help us work out what's wrong here. > > Greg Hi Leif, cc Greg et all, If it's a 1542A let me know ! I have a directory of notes on the 1542a & FreeBSD (see below). Brief summary of symptoms: Intermittent burst of 8 * 0xFF bytes on occasional multiples of (I recall) 1or4K boundaries on drives >= sd1 , mainly when multiple devices active (I think). Others apart from me have seen similar. I have an A, a B, and a C, but no complaints about the B or C. If your problem is with a B or C, I have nothing useful to contribute, in that case I suggest you just discuss with . If you have an A with problems, please mail me, and also CC the following: tomppa@fidata.fi, fabio@cesar.unicamp.br, gcrutchr@nightflight.com, j@uriah.heep.sax.de, jc@irbs.com, julian@freebsd.org, kuku@gilberto.physik.rwth-aachen.de, nikm@ixa.net, tomppa@fidata.fi, wilko@yedi.iaf.nl, Greg Lehey , Julian H. Stacey , Leif Neland who all have, or have had an interest in FreeBSD & 1542A scsi cards. I'm no scsi expert, just someone who's put a lot of time into observing the 1542A 8 0xFF bytes bug, (& even ripped off cache chips & replaced, & thrown out a perfectly good 500M drive, all seeking to track this down (It'd be cheaper to Axe my 1542A into final submission ;-). If it's a 1542A card, please read my archive of mail, try my testblock/ & 8f/ & let us know your results, etc. General data testing tool: http://www.freebsd.org/~jhs/src/bsd/jhs/bin/public/testblock/ Specific 1542A corrupt data testing search tool (use with find): http://www.freebsd.org/~jhs/src/bsd/jhs/bin/public/8f/ Archive of mail (will upload in next days (as of 1997.11.26)): http://www.freebsd.org/~jhs/1542a/ Julian - -- Julian H. Stacey jhs@freebsd.org http://www.freebsd.org/~jhs/ ------- End of Blind-Carbon-Copy