[4968] in linux-scsi channel archive
Re: Problems with NCR875
daemon@ATHENA.MIT.EDU (Gerard Roudier)
Thu Oct 22 15:45:02 1998
Date: Thu, 22 Oct 1998 20:46:46 +0200 (MET DST)
From: Gerard Roudier <groudier@club-internet.fr>
To: "Luca Palazzo (IW9EXL)" <lpala@genius.cdc.unict.it>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.4.04.9810221349330.3328-100000@genius.cdc.unict.it>
On Thu, 22 Oct 1998, Luca Palazzo (IW9EXL) wrote:
> On Wed, 21 Oct 1998, Gerard Roudier wrote:
> [...]
> > On Wed, 21 Oct 1998, Luca Palazzo (IW9EXL) wrote:
> [...]
> - Viking II + HP6020i connected to 68 pins internal connector (the HP is
> in a external box connected by an external cable, but to the same 68 pin
> internal connector)
> >
> > > ncr53c875-0: SCSI parity error detected: SCR1=1 DBC=19000000 SSTAT1=f9
> > > scsi : aborting command due to timeout : pid 2261, scsi0, channel 0, id 1,
> > >
> > > and i'm not able to use none of two CDs. When HP is not connected everything
> > > works really fine. This problem appeared when i changed my Plextor 12Plex
> > > with Ultraplex; everything worked fine with 12plex.
> > > I've tried to disconnect the Ultraplex and leave connected only two HDs and
> > > HP and everything works fine. The problems are only when i connect HP and
> > > Plextor.
> > > The parity is ON on every device....
> > > The driver is 3.0g, kernel 2.1.119 or 123, and 3.0i with 2.1.125.
> >
> > Use preferently 3.0i or newer.
> >
> > > I don't know what i can do... I've tried near everything...
> >
> If i change the ultraplex with an 12plex, everything works fine...
> I think there would be some problem when the driver finds two cds that
> have negotiated different speeds.
If the driver were so broken, probably my ISP would pay me for going away
since my mailbox would run the risk to explode at his face due to the
astronomical number of problem reports I would receive. :-)
> When Ultraplex (Fast-20) and HP
> (Fast-10) are connected ==> no work. IF 12Plex (Fast-10) and HP (Fast-10)
> ==> OK.
Fast-20 Single Ended SCSI has very low electrical characteristics margin.
Please, would you want to describe accurately to me your SCSI BUS in terms
of:
- Cable length and quality.
- Connectors.
- Terminator types (active/passive).
- Position of each device and each termination.
Regards,
Gerard.
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