On Tue, Feb 08, 2000 at 09:44:00AM +1100, Jason Thomas wrote:
> Can a dirty drive cause the machine to lockup. Or will it only cause
> corrupted reads and write to the tape device. we forgot all about the head
> cleaning tape that came with the drive.
It might (the drive's error correction circuits do a read after write, and if
it couldn't reread the same block, it tries again). For my daily dumps, I try
to get into a habit of running the cleaning tape every Monday when I switch
tapes. I also keep track of how many times I use the cleaning tape, and go to
the next one after 50 or so times. Similarly for DAT tapes, I do a verify
after the dump, and if I get excessive differences or errors, I thow out the
tape.
> Michael Meissner [[EMAIL PROTECTED]] wrote:
> > On Mon, Feb 07, 2000 at 10:21:16AM +1100, Jason Thomas wrote:
> > > We hava a Sony SDT-9000 that locks up the machine. It has been tried in two
> > > different machines and does the same thing, We also tried a Seagate 24GB
> > > drive in those same machines and it works flawlessly.
> > >
> > > The machine locks up to the point where SysRq still works but can't perform
> > > any IO function so Emergency sync does not work but Dumping Memory stats
> > > still works.
> > >
> > > The Tape Drive has been sent back to the supplier under warranty and tested,
> > > they claim that It is okay.
> > >
> > > The Scsi controllers are different in both machines, various kernel versions
> > > have been tried.
> > >
> > > When we first bought the tape drive it worked fine for about three months
> > > before this happened.
> > >
> > > Any ideas..
> >
> > You might want to check out how you terminate the drive and whether you have a
> > laser printer near the drive. I had similar problems with my HP DAT24i, and
> > I'm on my 3rd drive now. The first drive failed after 3 months with medium
> > sense errors, and in talking to HP they said that laser printers emit charged
> > particles that can get into the mechanism, and also that the drive wanted
> > active termination on an ultra controller (the guy who built my system had
> > enabled the termination on the CD-R). For the 2nd tape drive, I put the tape
> > on a non-ultra controller and moved the printer away from the computer (though
> > in the last 2 months, I had to have the printer in the same room due to
> > construction going on in my office). Now I have the drive with a separate
> > active terminator, and the laser printer in a separate room. We'll see in 3
> > months if the failure occurs again.
> >
> > --
> > Michael Meissner, Red Hat, Inc.
> > PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886
> > Work: [EMAIL PROTECTED] phone: 978-486-9304 fax: 978-692-4482
> > Non-work: [EMAIL PROTECTED]
>
> --
> Jason Thomas Phone: +61 2 6257 7111
> System Administrator - UID 0 Fax: +61 2 6257 7311
> tSA Consulting Group Pty. Ltd. Mobile: 0418 29 66 81
> 1 Hall Street Lyneham ACT 2602 http://www.topic.com.au/
--
Michael Meissner, Red Hat, Inc.
PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886
Work: [EMAIL PROTECTED] phone: 978-486-9304 fax: 978-692-4482
Non-work: [EMAIL PROTECTED]
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