dead DLT drive? (I/O erors, sense data errors, "write filemark" error)
minxmertzmomo at gmail.com
Tue Dec 20 14:56:38 UTC 2005
On 12/19/05, Gene Heskett <gene.heskett at verizon.net> wrote:
> On Monday 19 December 2005 18:46, Matt Morgan wrote:
> >I'm trying, still to get a working Amanda setup. This is on my home
> >system in advance of setting it up for a client next week :-). It's
> >FC4, and the drive is a Quantum DLT 7000, which I think is a 35/70Gb
> >model. It's old.
> >I think the old DLT drive (haven't used it for a few years, but it
> >worked the last time I had it plugged in) may be dead. Here's what I
> >1) The "use cleaning tape" light was on. I plugged in a cleaning
> > tape, and the light went out; but then when I plugged i na real
> > tape, the drive pretty quickly turned the "use cleaning light" back
> > on again. This has happened a few times--the cleaning tape seems to
> > work, but then as soon as I put in a real tape, the drive wants
> > cleaning again.
> How old are your tapes, and under what conditions have they been
Well, they're as old as the drive ... and they haven't been stored in
anything like the conditions you recommend :-). I don't let my nice
wines sit around very long in this apartment, for example. I bet
Yuck--so now I have to decide whether my project is worth another $40.
> Old tape, particularly if its been stored in a humidity exceeding 50%,
> can get quite abrasive and leave large amounts of oxide gunk on the
> heads rapidly. I'd also see about getting it (the drive) out of its
> skin and making use of a chamois stick moistened with alcohol (not
> rubbing, its got water in it, use paint thinner or better) to gently
> clean the head, making sure you do not rub it sideways, but in the
> same direction the tape travels.
> 75F and 80+% relative humidity is death for tape, but only mildly
> uncomfortable for us humans.
It's good to hear someone say this with authority. Back when I was
using these tapes at work, they seemed to go bad a lot, even after
only a couple months. On the tape container the environmental
requirements listed were a little broader. The room was
air-conditioned but not humidity-controlled and this is New York,
where 80%+ humidity is common in Summer.
We were going through enough tapes at the time, and had a redundant
enough backup, that the loss of a few of them wasn't really worth
worrying about in advance of our upgrade to a big LTO library and a
better tape storage system. I always wondered, though.
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