In the message dated: Mon, 11 Mar 2013 22:44:25 -0400,
The pithy ruminations from John Drescher on
<Re: [Bacula-users] tapes randomly become unrecognizeable> were:
=> > DO NOT PRINT YOUR OWN LABELS
=> > EVER
=>
=> I have for the last 100 or so tapes and I have had 0 issues with that.
=>
In my experience, the readability of barcode labels is highly dependant on the
combination of the label and the barcode reader.
Since 2006 we've had:
LTO2 library ~100 pre-printed labels, no problem
LTO3 library ~100 pre-printed labels, no problem
~50 in-house labels, no problem
~100 in-house labels, no problem
~50 in-house labels, no problem
LTO3 2nd library ~50 in-house labels, ~1% failure rate
LTO3 2nd library ~50 in-house labels, ~1% failure rate
LTO4 50 pre-printed labels, no problem
50 in-house LTO4 labels: ~75% failure
~75% failure reading existing LTO3
in-house labels (100% failure for some
batches, ~25% failure for other batches)
~ 5% failure rate reading pre-printed
LTO3 labels
Over the years, we've used different parameters for printing labels,
with extremely minor changes (mm) in the height and width of the labels.
All labels were printed with a color laser printer onto self-adhesive
(Avery 6577) label stock, following the TriOptic color coding and the
USS-39 barcode standard.
However, each the barcode reader on each of our tape libraries is
different--some (the 2nd LTO3 library) were slightly sensitive to
the label placement (whether it was straight, whether it was to the
left/right/top/bottom of the indented region on the tape cassette),
while the reader in our current LTO4 library is extremely sensitive to
the barcode size, label position, stray ink or discoloration on the edge
of a label, etc. The LTO4 libarary has even had difficulty reading some
pre-printed labels.
We've used the following on-line barcode generators, as well as local perl
scripts:
http://www.mytapelabels.com/
http://blog.maniac.nl/index.php/webbased-pdf-lto-barcode-generator/
In short, I'd say that the success--or failure--of locally generated barcode
labels is highly dependent on the combination of the label and the barcode
scanner; there is no absolute answer for every environment.
Mark
=> John
=>
=>
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Mark Bergman voice: 215-662-7310
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Department of Radiology University of Pennsylvania
PGP Key: https://www.rad.upenn.edu/sbia/bergman
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