Proxmox Online LTO Barcode Generator

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Apr 21, 2026
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Hello dear Proxmox dev team!

I stumbled across the online LTO barcode generator a couple weeks ago, and I must say it is a fantastic tool! IMHO, you should really make it more visible (e.g. direct link on the PBS page) because I am sure a lot of people don't know it exists. The same applies to the Backup Pruning Simulator, it is incredibly useful to fine-tune retention policies!

I also wanted to let you know that I found a limitation on the barcode generator: it currently requires a leading uppercase letter [A-Z] as a prefix, but the LTO standard dictates that this could also be a number. In fact, the first 6 chars may be anything [A-Z;0-9], so basically a prefix is not required at all. I agree that most people creating new media sets would probably start the labels with at least one letter to identify media sets faster, but when you already have dozens or hundreds of factory-labeled cartridges that don't have any prefix, you're blocked... Maybe you could remove this design limitation?


I'll put the links below for those who come across this post and don't know these tools yet...

LTO Barcode Generator:
https://pbs.proxmox.com/docs/lto-barcode/index.html

Backup Pruning Simulator:
https://pbs.proxmox.com/docs/prune-simulator/

Cheers,

Denis
 
Hello Denis,

thanks for posting on the forum!

You're right both are not the easiest tools to find and i agree they could be more present.
I've drafted a quick patch [1] for that and sent it to the devel list. Let's see what the others think.

In general please consider reporting feature requests in our Bugzilla [2].

Concerning the prefix limitation:
There seems to be no specific reason why it is limited to characters so i also removed that [3].

Thanks for noticing and letting us know!

Best regards
Jonas

[1] https://lore.proxmox.com/pbs-devel/20261111173428.498121-1-j.theisen@proxmox.com/T/#u
[2] https://bugzilla.proxmox.com/
[3] https://lore.proxmox.com/pbs-devel/20261111173346.497452-1-j.theisen@proxmox.com/T/#u
 
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