SCSI tape data loss

[Matthew Jacob]

> And we have finish:
>
> ./tpt -v -b 5120 -r 10000000000 -n 10 -f /dev/nrsa0
> .......Rewind Tape
> ........Write Pass
> WEOT at File 0 Record 694983 Offset 0 (3558312960 total bytes written)
> Elapsed Seconds: 5467; Data Rate: 0.620633MB/s
> .......Rewind Tape
> .........Read Pass
> REOT at File 1 Record 0 Offset 0 (3558312960 total bytes read)
> Elapsed Seconds: 4422: Data Rate: 0.7673MB/s
> --

Now, tape_pattern_tester actually does some somewhat simplistic data
integrity checking, so I tend to believe that the bytes read do match
the bytes written.

This now begs the question as to why Bacula lost some records.

I'm going to ponder this a bit today while I'm at one of my paying gigs.
I'll hook up a tape drive to a FreeBSD box @ Feral tomorrow and see if I
can anylyze Bacula a bit closer.

-matt