From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 5 Sep 2001 09:07:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 5 Sep 2001 09:07:01 -0400 Received: from mailout03.sul.t-online.com ([194.25.134.81]:26643 "EHLO mailout03.sul.t-online.de") by vger.kernel.org with ESMTP id ; Wed, 5 Sep 2001 09:06:58 -0400 Message-ID: <3B962319.F9B710B4@t-online.de> Date: Wed, 05 Sep 2001 15:05:29 +0200 From: SPATZ1@t-online.de (Frank Schneider) X-Mailer: Mozilla 4.76 [de] (X11; U; Linux 2.4.3-test i686) X-Accept-Language: en MIME-Version: 1.0 To: dl8bcu@dl8bcu.de CC: Antonio Miguel Trindade , linux-kernel@vger.kernel.org Subject: Re: aic7xxx errors In-Reply-To: <200109050621.f856LAK00824@ambassador.mathewson.int> <3B95DB22.866EDCA3@mediascape.de> <3B95EA8F.93B27304@t-online.de> <200109051027.f85ARmM10012@polaris.dei.uc.pt> <3B960208.7121318@t-online.de> <20010905112127.A21405@Marvin.DL8BCU.ampr.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Thorsten Kranzkowski schrieb: > > On Wed, Sep 05, 2001 at 12:44:24PM +0200, Frank Schneider wrote: > > Antonio Miguel Trindade schrieb: > > > Em Quarta 05 Setembro 2001 10:04, Frank Schneider escreveu: > > > > Olaf Zaplinski schrieb: > > > > > > > > I had this effect too here (RH7.1, Kernel 2.4.3), but i put it on a > > > > wrong termination of the LVD Bus...be careful if you have LVD-Drives > > > > with a "Termination"-Jumper...(e.g. IBM DGHS18V)...this Termination is > > > > only usable if you use the drive as Single Ended SCSI-UW, *not* if you > > > > use the drive i a true LVD-environment ! > > > > > > > > > > According to IBM specs, _no LVD drive has terminators built-in_... I have > > There are definitely some that have this SE-Termination jumper. Yes...i can send you one if you send me a spare-drive instead...:-)) > > > > But as said, my DGHS-Disk has a build-in terminator for use with > > UW-buses...the bad thing is, that if you "terminate" the LVD-bus with > > this, it seems to work...for some time...i had "/" on it and a part of > > my /home-RAID5, and it run 2 weeks.... > > Usually when a single device in a LVD chain is operated in SE mode all LVD > devices also switch to SE mode automatically. The use of a SE terminator > such as the one on your harddisk qualifies for SE operation. Thats exactly what i expected, but that did not happen...i tried this one time by setting the "SE"-Jumper on *all* devices *and* connecting them to the UW-cable (i use a Asus P2B-DS-Mobo with 3 connectors, Fast-SCSI, UW-SCSI, LVD-SCSI)..their it worked in the described way, but on the LVD-cable not even the SCSI-Bios at bootup mentioned the problem...all devices were "LVD-SCSI" rated, and not "SE/FastSCSI" at bootup...and /proc/scsi/aic7xxx/0 also said something about "80MByte/sec synchronous speed..." It seems that in this particular case you don`t get any hint where the problem lies...neither from the bios nor from the driver...i noticed it when i changed the LVD-cable and took a closer look on the disks...and then in the specs on www.storage.ibm.com.... > But in SE mode you are tied to the much stricter specifications like length > of cable etc. compared to LVD mode. Thats clear...max. cablelength is 1,50m (if more than 4 devices are connected), all together, incl. Fast-SCSI-cable or external cables, if used... > So maybe you just exceeded specifications too much. I did this also one time (6 Devices-2m cablelength) and it showed indeed the same problems...randomly appearing crashes on the scsi-bus, sometimes revoverable, sometimes not, sometimes under heavy disk-load, sometimes without... Solong.. Frank. -- Frank Schneider, . Microsoft isn't the answer. Microsoft is the question, and the answer is NO. ... -.-