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Date:      Wed, 20 Dec 2006 02:09:47 -0600
From:      Mark Kane <mark@mkproductions.org>
To:        Dan Nelson <dnelson@allantgroup.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: SCSI Tape Drive Problems
Message-ID:  <20061220020947.135537e1@localhost>
In-Reply-To: <20061220051644.GB41207@dan.emsphone.com>
References:  <20061219221610.4bcdb4c4@localhost> <20061220051644.GB41207@dan.emsphone.com>

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On Tue, Dec 19, 2006, at 23:16:45 -0600, Dan Nelson wrote:
> Timeouts and unexpected busfree errors like these are indicative of
> cabling or termination problems.  I don't think DLTs auto-terminate,
> for example, so try putting an external terminator on the 2nd plug on
> the back of the unit (or if it's an internal drive with one plug,
> terminate the cable the drive's plugged into).  Once you get those
> errors sorted out, see whether you still get incorrect volume full
> messages.

Thanks very much for the replies. Both drives are external, and they
both have terminators on the back. The setup is like this:

The DDS autoloader is connected to the back of the Adaptec card via a
new external HD68 cable and the terminator that came with the drive
is on the second plug of the unit.

The Sun DLT drive is connected via an external HD50 cable to an adaptor
that turns it into an internal cable which is then connected to the
Adaptec card internally. It has a Sun terminator on the second plug on
the unit.

The cable that connects the DDS autoloader is brand new. It's not a
major brand name, but it's listed as "double shielded", "UL20276
listed", etc. The cable that connects the DLT unit is an older Adaptec
one (possibly used) purchased for a few dollars locally. I could
understand if that cable was a problem for writing using that drive, but
having the issue on both drives like this with two separate cables just
seems like it's something else.

By the way, the green LEDs on both terminators are illuminated so they
should be working.

With the DDS drive, it does not give any errors to /var/log/messages
like the DLT drive does. cpio just quits with that "Internal overflow,
aborting" error (which doesn't happen with the DLT). Do you guys know
specifically what that message means? With the DLT drive, cpio actually
gives the volume full errors but with the DDS it's only "Internal
Overflow" and nothing else anywhere that I can see. Internet searches
for the "Internal Overflow" message have not turned up much helpful
information.

Thanks again.

-Mark

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