>>>>> On Fri, 7 Aug 2009 23:33:37 -0400, Mike Chisholm said:
> > Were there any syslog messages at this time?
> Yes
> Aug 5 10:13:07 pendual kernel: [ 7737.941074] st0: Sense Key : Medium Error
> [current]
> Aug 5 10:13:07 pendual kernel: [ 7737.941150] Info fld=0xfc00
> Aug 5 10:13:07 pendual kernel: [ 7737.941161] st0: Add. Sense: Sequential
> positioning error
> This repeated 3 more times at
> Aug 5 10:14:04
> Aug 5 10:16:24
> Aug 5 10:16:24
Looks very much like a hardware problem (tape corrupted).
> > What is the TWO EOFs setting for the device in Bacula's sd config? Does
> > this
> > match the setting in the drive?
>
> There is no setting in the SD config so I think the default is TWO
> EOF=no. I'm not sure how to check this on the drive itself. I have tried
> various st, mtx, tapeinfo, and smartctl commands but none of them return
> something that is obvious to me.
Sorry, I don't know on Linux (on FreeBSD mt has a geteotmodel command). It is
probably set to one EOF by default like Bacula.
> FWIW, the last two days of backups to the
> next tape have performed flawlessly so perhaps this is a bad piece of
> media. It just seems pretty coincidental that I had this problem after a
> power failure. I'm working on getting this system hooked to a UPS as
> well. I'm not sure it's worth a lot of effort to try to figure this out, I
> mainly wanted to make sure I wasn't missing something obvious. I am willing
> to continue digging in it if anyone is really curious, otherwise I think I
> will just let thing continue and see how it goes. Assuming there was just
> some glitch caused by loss of power, I would think the next time bacula goes
> to write to this media it will read the header and begin writing new data
> with a new EOF after the first volume, then just appending additional
> volumes and writing new EOF's after each one, correct? So any count problem
> will just get overwritten. If it is actually bad media I will probably hit
> it again but then I'll know and can just toss the tape.
Yes, a purged and recycled tape will be written from the start next time.
__Martin
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