There was a thread in January of 2012 discussing how to get tapes that are 
already labeled with a block size that is too small, usually the default 64K, 
to be relabeled in order to be the new block size set in bacula-sd.conf.  One 
of the recommendations was to erase the tape.  Since I had almost 200 LTO-5 
tapes already labeled and otherwise empty, the erase time per tape runs approx. 
3 hours.  No joy here.  I've worked it out and found the following bconsole 
commands to do the job and fairly quickly.  Relabel will not permit the use of 
the same label, so I just relabeled twice, removed the L5 designator the first 
time and reapplied it the second time.  If someone knows of a better approach, 
I'm all ears.  I just thought that I'd share something that does work.  I have 
not tried it with a tape containing data.

mount storage=changer drive=0 slot=170
update volume="076999L5" volstatus="Recycle"
relabel storage=changer oldvolume="076999L5" volume="076999" pool="Scratch" 
drive="0" slot=170
update volume="076999" volstatus="Recycle"
relabel storage=changer oldvolume="076999" volume="076999L5" pool="Scratch" 
drive="0" slot=170
unmount storage=changer drive=0

Patti Clark
Information International Associates, Inc.
Linux Administrator and subcontractor to:
Research and Development Systems Support Oak Ridge National Laboratory


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