(Fwd) Re: SCSI tape data loss

[Nate Lawson]

On Wed, 27 Aug 2003, Kern Sibbald wrote:
> Many thanks for testing this ...
>
> It seems to me that your tests, clearly indicate that
> there is a problem even though you had no data loss.
>
> When you ran without -pthread, the status
> received by the program was a 0 with 141776
> blocks written. This is correct.
>
> When you ran with -pthread, the status
> received by the program was a -1 with 142879
> blocks written. This is "not correct".
>
> To me, that shows very clearly that with -pthread
> the 0 status was lost and more blocks were written.
> In fact, in this case so many blocks were written
> that the tape was not properly terminated with
> an EOF (actually two EOF marks).

Here is a response I got by forwarding this to the pthreads maintainer:
> A return status of 0 from write is not interpreted as an End-Of-Tape.
> The threads library isn't smart enough to know that the file
> is a tape device and that a 0 status should break it out of the
> loop.  Thus, it continues writing.
>
> Use libkse :-)
>
> --
> Dan Eischen

-Nate