I thought I had fixed this by upgrading to Bacula 5 (as part of Fedora 13 
upgrade) and reverting bacula-sd.conf settings to defaults.  I can perform 
reboots, stop & restart bacula-sd, and Bacula is able to append.  However the 
other day the system locked up (due to an unrelated issue) & I had to reboot 
the hard way with the power switch.  After that I am back to MTEOM tape 
positioning errors:-
08-Jul 01:06 bacula-sd JobId 315: Error: Unable to position to end 
of data on device "SLR7" (/dev/nst0): ERR=dev.c:956 ioctl MT
EOM error on "SLR7" (/dev/nst0). ERR=Input/output error.

If I try to position at the end of this tape I get an I/O error:-
[root@localhost dev]# mt -f /dev/nst0 eod
/dev/nst0: Input/output error
But if I use the previous week's tape, which did not have any errors, mt -f 
/dev/nst0 eod successfully positions the tape.

It looks as if Bacula writes the EOM marker when it is shut down nicely, not 
when it completes the backup job; if it is shut down brutally it doesn't get 
written and so the end of the medium can't be found.  Is this how Bacula really 
works?  If it is, how can I get round it, or is it a bug?

For the record, my (default) bacula-sd.conf settings are:-
   Hardware End of Medium = Yes
   Fast Forward Space File = Yes
   Use MTIOCGET = Yes
   BSF at EOM = No
   Two EOF = No
   Backward Space Record = Yes
   Backward Space File = Yes
   Forward Space Record = Yes
   Forward Space File = Yes
and my tape driver options are 
The options set: buffer-writes async-writes read-ahead can-bsr

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