[110] in linux-scsi channel archive
Re: Lockups with aha1542cf
daemon@ATHENA.MIT.EDU (Kai Harrekilde-Petersen)
Wed Mar 22 02:44:34 1995
From: Kai Harrekilde-Petersen <khp@pip.dknet.dk>
To: eowmob@exp-math.uni-essen.de (Michael Weller)
Date: Tue, 21 Mar 1995 21:38:38 +0100 (MET)
Cc: linux-scsi@vger.rutgers.edu (Linux SCSI mailing list)
In-Reply-To: <Pine.3.89.9503201338.C70398-0100000@werner.exp-math.uni-essen.de> from "Michael Weller" at Mar 20, 95 01:26:39 pm
Michael Weller wrote:
> I've no real idea, but since you didn't mention it, you should maybe have
> a look at the disconnection settings. I heard that the 1542CF allows just
> like my 1742 to enable/disable disconnection on a per device basis.
Correct. Right now, it is set to allow disconnection on both (all) devices.
> Usually you really want disconnection on a tape coz it is slow... (and if
> it works on all other devices as well) If you don't use it the system will
> indeed freeze on long tape activities.. However you talked about complete
> lockups, did you?
Indeed. Very solid, very complete lockups. (wrt the lockups that the NEC
cd-rom gave, i could hear it got into fits with moving the laser around and
changing the speed of the disc. Not really a scsi lockup)
> Still some of your devices may have problems with that.. Maybe disconnection
> is enabled and either tape or disk can't stand it..(or needs some jumper
> setting to do so). At least if I were you I'd play around with the settings.
I'm going to remove the cover of the box and let run run "naked" for a
while so I can observe the LED on the controller board and try to "play"
with the thing some more.
> > Since I bought an IBM DPES-31080 disk, I have experienced SCSI lockups when
> > I backup from the disk to my Wangtek 6200-HS DAT drive.
>
> Just as a datapoint... I use an IBM disk for a very long time now...
> works like a charm (except when I inquire defect lists in a non standard
> format.. then locks up til the next power cycle). However it is of a
> different type (BTW, this typeno sounds weird to me.. never heard of a
> recent IBM disk with that type..)
It's an "OEM disk drive" (meaning that IBM will sell it to OEM's). The
series contains the DPES-30540 (541Mb), -30810 (812Mb), and the 31080
(1083Mb) drives. Physically, the drive is a 25.4mm high, 3.5" unit.
Apparently, the DPES-3xxxx series is a lower performance/cost/capacity range
to complement their 0662/0664 disks (which are 1Gb / 2Gb).
> This sounds also like it is either a disconnection problem and/or some
> firmware bug in either the dat or the disk..
I'm inclined to say it's the disc, because I talked to a friend of mine (Hi
Niels!) who also has a Wangtek DAT (we bought our drives through a group
buy on comp.periphs.scsi), and he has had no such problems on his aha1542cf
(but he changed is M/B + scsi controller, so we can't do a direct
"back-to-back" test).
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.
(To Be Continued!)
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 =====
