[2609] in linux-scsi channel archive
Re: Quantum SCSI and Fujitsu IDE Interaction
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Sat Oct 11 12:30:49 1997
Date: Fri, 10 Oct 1997 09:58:14 +0200 (CEST)
In-Reply-To:
<C02FF9DC1632D111994600805F9A73C802E76E@srv-src-sd02.src.uniden.com>
From: Kurt Garloff <garloff@kg1.ping.de>
To: "Stearns, Fred" <fstearns@src.uniden.com>
CC: SCSI-Linux mailing list <linux-scsi@vger.rutgers.edu>
On Thu, 9 Oct 1997, Stearns, Fred wrote:
> When I read and write to the IDE drive by itself, everything works.
> Similarly, when I read and write to the SCSI drive by itself, everything
> works. When I copy many files from the SCSI drive to the IDE drive,
> everything works. However, when I copy many files from the IDE drive to
> the SCSI drive, I eventually get a SCSI timeout, i.e. it is only SCSI
> write operations that time out, and only when reading from the IDE drive
> at the same time.
The problem might be that you transfer multiple sectors per request on
your IDE drive via PIO. This takes a long time during your system is
occupied servicing the IDE IRQ.
Try to enable dma (hpdaprm -d1) and/or to reduce the multiple sector count
(hdparm -m 4) of your IDE drive and see if the problem persists.
Kurt Garloff, Dortmund
<K.Garloff@ping.de>
