I know that this error has been a topic off and on for bacula users.  I may 
have some light to shed on one occasion when it happens, but I will ask a 
question at the end.

I have 2 drives in my changer, both have tapes loaded from the same pool.  2 
jobs start at the same time.  Job #1 wants to use the tape in drive #2 and 
begins by unloading the tape in drive #1.  Meanwhile, job #2 is happy with the 
tape in drive #2 and begins the backup process.  Job #1 completes the unload 
operation of the tape in drive #1 and requests loading of the tape that is in 
drive #2.  The tape in drive #2 is unloaded, put into its changer slot and then 
a load operation is executed to place the tape into drive #1.  At this point 
drive #2 does not have a tape and when job #2 is ready to write to tape, it 
finds no volume in the drive and the error "Fatal error: askdir.c:340 NULL 
Volume name. This shouldn't happen!!!" is generated and the job ends with a 
Fatal error status.

So, the question, why is bacula requesting different tape volumes from the same 
pool when the tape volume already present in the drive is perfectly acceptable? 
 A related question, I have had jobs insisting on using a tape that is already 
in use by another job in another drive and will wait for it  and send out 
notification complaints until it either gets the tape or times out and ends in 
an error state – why is that?

Patti Clark
Linux System Administrator
Research and Development Systems Support Oak Ridge National Laboratory


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