Date: Tue, 26 Aug 1997 13:26:21 -0500 (CDT) From: bartling@cyrix.com (Steve Bartling) To: freebsd-scsi@freebsd.org Subject: Re: Freebsd2.2.2, adaptec 1742A and Ultra SCSI drive (fwd) Message-ID: <199708261826.NAA16135@mega.eng.cyrix.com>
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Thanks Tom,
Does anyone know where I can get access to the mode
page information for the Micropolis 4743NS SCSI hard
drive ?
I need to know what parameters I am mucking with and what
each option represents.
Also, a pointer to some DOS based software that will
allow me to do the bit twiddling would be appreciated.
Please read the informative post from Tom below for
the background to the above questions.
- Steve Bartling
P.S. Of course, the micropolis web site is less than forthcoming
when you need this level of detail.
> From: Tom Proett <proett@nas.nasa.gov>
> Content-Length: 4210
>
> Hi,
>
> I have a 1742 with a quantum atlas drive so I had to fuz with
> the disk to get it to work with the adaptec. Here is the
> email that saved me. It is archived on the freebsd site.
>
> Tom
>
> > > >I replaced a defective Micropolis 2217 1.7 Gig Fast SCSI-2
> > > >drive with a new ultra scsi Micropolis 4743NS.
> > > =
>
> > > You may want to try playing around with mode page two on
> > > the drive. I remeber that the Atlas I wouldn't work on the 1742A
> > > unless you slowed it down a little bit. It seems that if you
> > > cut your bus signal times close to the minimum the spec allows,
> > > the 1742 becomes confused. There is probably a FAQ entry
> > > somewhere on Quantum's web site that talks about the problem
> > > the Atlas I had and hopefully the solution they give is not
> > > vendor specific and can be used on your 4743NS.
> > > =
>
> > > --
> > > Justin T. Gibbs
> > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > FreeBSD: Turning PCs into workstations
> > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
> 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
> Sender: owner-questions@FreeBSD.ORG
> Subject: Re: quantum atlas vs adaptec
>
> 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 resulte=
> d
> > in a freeze. I contacted Quantum and they said there was a timing prob=
> lem
> > between the atlas and the adaptec 1742 and gave me a firmware upgrade f=
> or
> > 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 Adapt=
> ex
> 1742A. The reason is the cache of the Atlas and the "slow" Adapte=
> c.
> When the disc gets the blocks out of the cache, it's too fast for t=
> he
> controller and locks the SCSI-bus cause the first bytes are lost. T=
> he
> solution of this is to edit the mode page of the Atlas (getting th=
> is
> 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 del=
> ay
> 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 K=F6ller Phone: +49 381/498-1665, Fax: -1667
> Universit=E4t Rostock E-Mail:
> Fachbereich Physik Lars_Koeller@odie.physik2.Uni-Rostock.=
> DE
> Universit=E4tsplatz 3 Anonymous ftp:
> 18051 Rostock (Germany) ftp://odie.physik2.uni-rostock.de/pub
>
> -------------------------------------------------------------------------=
> ---
> www@freebsd.org
>
>
> -- =
>
> proett@nas.nasa.gov
> NASA Ames Research Center
>
>
>
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