[nycbug-talk] tape drive woes

Tillman Hodgson tillman
Fri Feb 4 12:06:20 EST 2005

On Fri, Feb 04, 2005 at 11:19:37AM -0500, Dan Langille wrote:
> On 3 Feb 2005 at 22:11, Tillman Hodgson wrote:
> > 
> >   camcontrol negotiate da0 -R10 -q -a
> > 
> > I'm simply moving the bus from 20MHz to 10MHz which, at 16 bits wide,
> > moves me from 40MB/s to 20MB/s. That's more than fast enough for the
> > drives I have in the JBOD (which aren't ever accessed simultaneously
> > with the use I've put them to) and all top out at about 12MB/s
> > anyway).
> I've not tried that yet.  Last night, I tried a DDS-2 tape. I was 
> able to back up.  But I still think something is wrong.  It's a DDS-4 
> drive, and I was unable to do a backup on a DDS-4 tape.
> While it was labelling the tape, a bit of tape would be fed through, 
> then the unit would "click" three times, rewind, and read the tape 
> again, click three times, repeat... several times.

That sounds more like a mechanism problem. Is this a fresh tape? If not,
does retensioning it cause the same clicking?


"Belief gets in the way of learning."
    -- Robert Heinlein

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