On Wed, Aug 4, 2010 at 12:18 PM, John Drescher <drescherjm AT gmail DOT com> 
wrote:
> On Wed, Aug 4, 2010 at 12:08 PM, Alan Brown <ajb2 AT mssl.ucl.ac DOT uk> 
> wrote:
>> John Drescher wrote:
>>
>>>> It does matter if they have data on them.....
>>>>
>>>
>>> Agreed. If they were from some other backup program you need to erase
>>> them first.
>>
>> Or if they have last night's Bacula backups on them...
>>
>> "Label barcodes" is an extremely dangerous command and should be used with
>> extreme caution.
>>
>
> I use it every time I add tapes for the last 4 years. It does not harm
> already written volumes at all.
>
It just ignores already written volumes. Here is the rest of the run
from this morning:

Media record for Slot 2 Volume "A00007" already exists.
Sending label command for Volume "A00086" Slot 3 ...
3307 Issuing autochanger "unload slot 1, drive 1" command.
3304 Issuing autochanger "load slot 3, drive 1" command.
3305 Autochanger "load slot 3, drive 1", status is OK.
block.c:1016 Read error on fd=9 at file:blk 0:0 on device "LTO2-1"
(/dev/nst1). ERR=Input/output error.
3000 OK label. VolBytes=64512 DVD=0 Volume="A00086" Device="LTO2-1" (/dev/nst1)
Catalog record for Volume "A00086", Slot 3  successfully created.
Media record for Slot 4 Volume "A00058" already exists.
Media record for Slot 5 Volume "A00023" already exists.
Media record for Slot 6 Volume "A00006" already exists.
Media record for Slot 7 Volume "A00072" already exists.
Sending label command for Volume "A00085" Slot 8 ...
3307 Issuing autochanger "unload slot 3, drive 1" command.
3304 Issuing autochanger "load slot 8, drive 1" command.
3305 Autochanger "load slot 8, drive 1", status is OK.
block.c:1016 Read error on fd=9 at file:blk 0:0 on device "LTO2-1"
(/dev/nst1). ERR=Input/output error.
3000 OK label. VolBytes=64512 DVD=0 Volume="A00085" Device="LTO2-1" (/dev/nst1)
Catalog record for Volume "A00085", Slot 8  successfully created.
Media record for Slot 9 Volume "A00028" already exists.
Sending label command for Volume "A00084" Slot 10 ...
3307 Issuing autochanger "unload slot 8, drive 1" command.
3304 Issuing autochanger "load slot 10, drive 1" command.
3305 Autochanger "load slot 10, drive 1", status is OK.
block.c:1016 Read error on fd=9 at file:blk 0:0 on device "LTO2-1"
(/dev/nst1). ERR=Input/output error.
3000 OK label. VolBytes=64512 DVD=0 Volume="A00084" Device="LTO2-1" (/dev/nst1)
Catalog record for Volume "A00084", Slot 10  successfully created.
Media record for Slot 11 Volume "A00054" already exists.
Media record for Slot 12 Volume "A00039" already exists.
Media record for Slot 13 Volume "A00073" already exists.
Media record for Slot 14 Volume "A00012" already exists.
Media record for Slot 15 Volume "A00037" already exists.
Media record for Slot 16 Volume "A00053" already exists.
Media record for Slot 17 Volume "A00074" already exists.
Media record for Slot 18 Volume "A00052" already exists.
Media record for Slot 19 Volume "A00030" already exists.
Media record for Slot 20 Volume "A00081" already exists.
Media record for Slot 21 Volume "A00082" already exists.
Media record for Slot 22 Volume "A00063" already exists.
Media record for Slot 23 Volume "A00083" already exists.

John

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