[8551] in linux-scsi channel archive
Re: SCSI write errors with Onstream ADR50 drive
daemon@ATHENA.MIT.EDU (Tom Sedge)
Wed Apr 5 07:08:53 2000
Date: Wed, 5 Apr 2000 12:07:00 +0100 (BST)
From: Tom Sedge <tom@cognality.com>
To: Ricky Beam <jfbeam@bluetopia.net>
Cc: Eric Lee Green <eric@estinc.com>,
"Karl B. Hammar" <karl@kalle.csb.ki.se>, linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.4.04.10004040117530.23096-100000@beaker>
Message-ID: <Pine.LNX.4.21.0004051205350.8008-100000@behemoth.cognality.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Tue, 4 Apr 2000, Ricky Beam wrote:
> On Mon, 3 Apr 2000, Eric Lee Green wrote:
> >He (Tom) says that he checked termination. However, that is not easy to check.
>
> *grin* "The light's green!" Seriously, if it's LVD then I assume it's a
> quality external terminator -- they are usually clamped to the end of the
> cable.
Yep.
> >I would first suggest making sure that a) you have active termination, and b)
> >you don't have passive termination enabled in one of the internal drives. This
>
> Again, if it's LVD, then none of the drives will have terminators.
>
> >sounds an aweful lot like a termination problem -- often an improperly
>
> Or a cable problem or even a power supply problem! If you are running in
> LVD mode, use a cable designed for it. Regular flat ribbon cable will
> not carry a full speed (40MHz) LVD signal without distortion. That's
> like running 100base-TX over phone wire.
We've got a purpose designed cable.
> Can you try dropping the bus to SE and/or reducing the speed of the tape
> drive. (i.e. run the drive in async mode just to make sure it isn't the
> drive.)
I'll try this once I've figured out how to do it (dropping to SE) Any
pointers?
Thanks for your help.
Best Regards,
Tom.
--
Cognality Ltd. tom@cognality.com Where dreams become reality....
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