[8550] in linux-scsi channel archive
Re: SCSI write errors with Onstream ADR50 drive
daemon@ATHENA.MIT.EDU (Tom Sedge)
Wed Apr 5 07:08:20 2000
Date: Wed, 5 Apr 2000 12:05:18 +0100 (BST)
From: Tom Sedge <tom@cognality.com>
To: Eric Lee Green <eric@estinc.com>
Cc: "Karl B. Hammar" <karl@kalle.csb.ki.se>,
linux-scsi@vger.rutgers.edu
In-Reply-To: <38E913B8.6711029A@estinc.com>
Message-ID: <Pine.LNX.4.21.0004051201060.8008-100000@behemoth.cognality.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Mon, 3 Apr 2000, Eric Lee Green wrote:
> "Karl B. Hammar" wrote:
> > Return defective unit to where you sold it.
>
> "bought" it, I presume. But: see below:
>
> > > All is well until we try reading or writing to a tape. The drive starts
> > > to show write/read behaviour and then nothing happens for a minute or so
> > > until a large number of SCSI write errors are reported by the kernel.
>
> He (Tom) says that he checked termination. However, that is not easy to check.
> 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
> sounds an aweful lot like a termination problem -- often an improperly
> terminated SCSI bus will work well enough to get the intial INQUIRY info
> across so that it shows up in /proc/scsi/scsi, but not well enough when you're
> trying to send actual bulk data. I have also had similar problems (though not
> so bad) when my SCSI cable was too long and I was not using LVD (Ultra 2),
> which allows long SCSI cables. How long is your SCSI bus?
I'll double check the termination when I can next take the machine down.
Onstream have since told me to upgrade to kernel 2.2.14 (but not why).
This hasn't fixed the problem.
We bought a special long SCSI LVD cable costing around $180, with 7
connectors on it. The cable is about 70cm long I think (maybe less).
I'll double check the setup of the other drives. The cable has a quality
end terminator.
I suspect it is probably the unit because the other 4 scsi devices (all
fast disks) are not experiencing any problems at all. RAID is working
perfectly as far as I can see.
> Or it could be a defective ADR50, as Karl said.
I think this must be the case. But I'll check out the other things too.
> --
> Eric Lee Green eric@estinc.com
> Software Engineer Visit our Web page:
> Enhanced Software Technologies, Inc. http://www.estinc.com/
> (602) 470-1115 voice (602) 470-1116 fax
Thanks for your help.
Best Regards,
Tom.
--
Cognality Ltd. tom@cognality.com Where dreams become reality....
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.rutgers.edu
