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Re: [Bacula-users] Data Loss on Tapes
2008-12-03 01:46:35
Alan Brown <ajb2 AT mssl.ucl.ac DOT uk> wrote on 03/12/2008
12:31:42 AM:
> On Tue, 2 Dec 2008, Glen Davison wrote:
>
> > The symptoms vary - sometimes there is an error at some point
through the
> > tape, and sometimes (suspiciously often) it seems to have lost
the bacula
> > label right at the start. These tapes were new, and the
rate of these
> > errors is far higher than I can attribute to bad tape manufacture,
etc.
>
> Scsi errors spring to mind.
>
> Are your cables within spec?
> Are your terminators in good condition?
>
> What kind of tapes are you using?
>
> If these are all ok, then suspicion should fall on the tape drive.
>
> > This system has had a history of problems, particularly scsi
problems.
>
> What kind of interface card are you using?
>
> AB
Alan, thanks for the reply.
I am pretty confident of cables and terminators. The
card is more suspect, but I think the most likely culprit is the tape library
itself - possibly the firmware on the drives. I've just had a protracted
battle with this library, and a parallel ongoing support call open with
HP. It wasn't pretty. ;(
The tapes are SDLT300/600, library is HP MSL6026.
Card is some sort of aic79xx. (lsmod) I can't remember exact
model number - I've changed it a couple of times.
"Jeff Kalchik" <jkalchik AT frontiernet DOT net>
wrote on 03/12/2008 02:15:43 AM:
> > This system has had a history of problems, particularly scsi
problems.
>
> Unfortunately, I'd suspect that this is the real source of your problems.
> Until you have a stable SCSI bus, anything sent down it is suspect.
I
> wouldn't even be sure the data got written to tape.
>
> Jeff "who's fighting loader errors on an L500" Kalchik
Jeff, I sure hope you're wrong, but that does make
sense. :(
It does mean though that I must have been having SCSI
problems for longer than I realised. Some of these tapes go back
many months.
Thanks for responses, guys.
Glen
--
Glen Davison
davo AT sirca.org DOT au
SIRCA Pty Ltd
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