Date: Wed, 8 May 1996 10:09:54 +0200 From: Lars Koeller <Lars_Koeller@odie.physik2.uni-rostock.de> To: proett@nas.nasa.gov, Lars_Koeller@odie.physik2.uni-rostock.de Cc: freebsd-questions@freefall.FreeBSD.org Subject: Re: quantum atlas vs adaptec Message-ID: <199605080809.KAA04881@odie.physik2.uni-rostock.de> In-Reply-To: Mail from 'Tom Proett <proett@nas.nasa.gov>' dated: Tue, 07 May 1996 14:33:33 -0700
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Hi!
> I grep'ed through the FAQ to see if there was any info on this but didn't
> find it so here goes...
>
> I bought a Quantum Atlas scsi disk drive (XP34300) and connected it to
> my Adaptec 1742A scsi adaptor. I have a micropolis disk as scsi id 0
> and the atlas is scsi id 1. The adaptec is scsi id 7.
>
> I started from DOS and ran fdisk fine. Then I tried format. All went
> well until the end when it was going to write the label. At this point,
> the system froze with the drive and adaptor busy lights on solid.
> I tried doing a few things with the drive and almost everything resulted
> in a freeze. I contacted Quantum and they said there was a timing problem
> between the atlas and the adaptec 1742 and gave me a firmware upgrade for
> the disk. It completed with no error but the freeze still happens.
> Trying to access the disk from FreeBSD results in a freeze as well.
Yes, I have the same problem with an Atlas XP32150 and the Adaptex
1742A. The reason is the cache of the Atlas and the "slow" Adaptec.
When the disc gets the blocks out of the cache, it's too fast for the
controller and locks the SCSI-bus cause the first bytes are lost. The
solution of this is to edit the mode page of the Atlas (getting this
information cousts me 3 days of hard search in the newsgroups). So do
the following:
- get the dsp programm for dos to edit the scsi mode pages (you
can get it from my anonymous ftp server).
- edit the vendor specific mode page 0x25 (hex)
- you get a byte-stream of
24 00 10 08 ..... a5 17 00 00 00 00 05 02 00 ....
^ ^
| Byte 0x05
Begin of Page (byte 0x0)
- change the byte 0x05 (set bit 3) to 0x08 this enables a 15 mys delay
for blocks out of the cache.
- all runs fine!
- NOTE: all the above fits for a 2 GB Atlas, but should also work
for the 4 GB version.
Be happy about this fast harddrive. Please e-mail on success.
Regards
Lars
--
___________________________________________________________________________
Lars Köller Phone: +49 381/498-1665, Fax: -1667
Universität Rostock E-Mail:
Fachbereich Physik Lars_Koeller@odie.physik2.Uni-Rostock.DE
Universitätsplatz 3 Anonymous ftp:
18051 Rostock (Germany) ftp://odie.physik2.uni-rostock.de/pub
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