[113] in linux-scsi channel archive
Re: Lockups with aha1542cf
daemon@ATHENA.MIT.EDU (Kai Harrekilde-Petersen)
Fri Mar 24 01:04:58 1995
From: Kai Harrekilde-Petersen <khp@pip.dknet.dk>
To: johnsonm@nigel.vnet.net (Michael K. Johnson)
Date: Thu, 23 Mar 1995 21:03:32 +0100 (MET)
Cc: linux-scsi@vger.rutgers.edu (Linux SCSI mailing list)
Michael K. Johnson wrote:
> Kai Harrekilde-Petersen writes:
> >One thing, though, which I am puzzling with in my mind is the possibility of
> >being a cabling problem. My cable is a standard flat-cable, bought at the
> >electronics-shop 'down at the corner. Drew says in the SCSI howto that the
> >1542cf is rather sensitive to non-spec cables, so this could be kicking me.
>
> I had a cable with connectors too close together that made for
> some *really* weird SCSI problems that went away when I got a
> cable designed to spec. Just a data point for you...
Interesting. How close were the connectors on the bad cable? I checked the
comp.periphs.scsi faq, and it seems to recommend 4-6 inches as a minimum.
My connectors are at least 6 inches apart, more likely 8 inches. However, i
seem to remember (in the _deep_ back of my hogde-podge memory) that the
connectors should be at least 12 inches (30 cm) apart(!). This would make
for absurdly long cables in my already rather filled minitower cabinet.
However, my lockup problem has been solved by disallowing the IBM disk to do
disconnections. I talked to the guys I bought the disk from, and they said,
after talking to their supplier (a whole-seller), that the disconnection
problem is not caused by the disk, but by the AHA1542CF(!). According to
the wholeseller, all disks f*k up the disconnection, when used together with
an 1542c/1542cf adapter. However, i'm not so sure.
Kai
--
Kai Harrekilde-Petersen <khp@pip.dknet.dk> Linux: choice of a GNU generation
>> Inside every little problem there's a BIG problem, struggling to get out <<
===== Please do not use my old account <khp@login.dknet.dk> as it's void =====
