Problems with Quantum Dlt7000 and adaptec 2940UW-Pro

[Stefan Schmidt]

Hi everybody,

please find attached a little mail conversation I've had with Alfred
Perlstein about problems with a Quantum Dlt 7000 and an Adaptec 2940UW-Pro

What I forgot to tell Alfred is, that when the drive was connected while I
was rebooting the machine, FreeBSD comes to driver ahc0 and than stopped and
an error message appeared saying
somebody is reseting ahc0.
FreeBSD was stopped and only this errormessage appeared on the screen, one
line behind the other until I switched off power.
On the same scsi bus are attached:
System harddisk and a cdrom drive.

If you have any questions please feel free to contact me.

Regards
Stefan

From: Alfred Perlstein <alfred at freebsd.org>
To: Stefan Schmidt <st-schmidt1 at gmx.de>
CC: tomsoft at freebsd.org
Subject: Re: Problems with a Quantum dlt7000 on FreeBSD
Date: Tue, 4 Nov 2003 08:30:47 -0800

thank you, I'm glad that you were able to solve your problem.

* Stefan Schmidt <st-schmidt1 at gmx.de> [031104 01:42] wrote:
> Hi Alfred,
>
> thanks for your quick reply.
> I solved the problem.
> It was a problem with the Scsi Bios.
> I changed the Adaptec 2940UW-Pro with an other 2940UW-Pro but this one has
> an other Bios version.
> After that, I set "enable disconnection" to disabled and what should I
say,
> it works :-)
>
> I will follow your recommendation and send this complete Mailthread to
> scsi at freebsd.org
>
> Thanks for your help
>
> Stefan
>
> > * Stefan Schmidt <st-schmidt1 at gmx.de> [031103 05:02] wrote:
> > > Hi Alfred,
> > >
> > > it might be that this is not one of your current projects, but I found
a
> > > mail thread where you described some problems with bus resets on the
> > scsi bus
> > > while using or trying to use a Quantum Dlt 7000 drive with FreeBSD
> >
> > I think I finally solved the problem when I figured out that the
> > cable i was using was LVD instead of "normal".  My suggestion would
> > be to boot the box running NT using a FreeBSD disk and see if it
> > works in that configuration.  If it does, then it's a matter of
> > checking bios settings for correct termination software settings
> > and double checking that you have the same cable on the NT box as
> > you do on the FreeBSD box.  Basically, make sure you have the
> > EXACT same setup on the FreeBSD box as you do under the NT box.
> >
> > Also mailing scsi at freebsd.org couldn't hurt.
> >
> > best of luck,
> > --
> > - Alfred Perlstein
> > - Research Engineering Development Inc.
> > - email: bright at mu.org cell: 408-480-4684
> >

-- 
- Alfred Perlstein
- Research Engineering Development Inc.
- email: bright at mu.org cell: 408-480-4684

Hi Alfred,

it might be that this is not one of your current projects, but I found a
mail thread where you described some problems with bus resets on the scsi
bus
while using or trying to use a Quantum Dlt 7000 drive with FreeBSD

I am using FreeBSD 4.8 and 5.1 and I bought a used drive as described above.

Every time I try to do something with the drive, the same error appears:
Unexpected bus free in command phase
Syslogd reports a dump of the ahc0 (Adaptec 2940-UW Pro) and the drive has
been removed from the bus.
To exclude other things I did the following:
- Changed cable
- changed port
- changed scsi device
- put device on a second adaptec 2940-UW Pro as only device on that bus.
- changed to an other machine (FreeBSD 4.7 installed)
- used different tapes
- changed several options in the scsi controllers bios (enable/disable
disconnect, command queing... and  
  so on)
Nothing, always the same:
Put tape in, wait until camcontrol tur states device is ready
mt rewind or mt status
device starts spooling the tape forward and backward for 1 or 2 minutes and
after that I get my dump and the described error message.
To check if the drive is broken, I took it to my company and connected the
drive to a simple Windows NT4 workstation.
was found, installed driver, reboot, open backup, write a backup of the
harddisk, verify, works perfect!
No problem, no errors, nothing.
Installed Quantum Check software for Dlts, did a complete test, any part of
the test has been passed without any error.

As I could read in this old mailthread, you had the same problems with the
same drive on FreeBSD 3.5.
Is it possible, that the driver for ahc0 or sa0 hasn't been changed since
that?
If this is possible, I would understand why the drive doesn't seem to work
on FreeBSD 3.5, 4.8 and 5.1
Did you find a solution or can you give me a hint?

Thanks in advance
Stefan

Ps.: Mail is cced to Tomsoft because Tom is a really good friend of mine and
I want him to stay informed.

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