Re: [Dar-support] Multiple slices on LTO6 tape

[Denis C. <dar...@fr...>]

Le 09/06/2022 à 11:49, me...@rm... a écrit :
> Dear Petr, Dear Denis,
> 
>> BTW - LTFS has a lot of problems - so it is not good replacement for
>> dar on tapes (it seems not to support multiple tapes either, moreover
>> the symlink and special files cannot be written - so you cannot backup
>> the system partition with it ...
> 
> Petr, you are right, LTFS cannot user Special file names, etc. or
> rights. But that is all managed by DAR.
> All LTFS has to do is:
> 1. save content -> dar slices and maybe the dar catalogue files
> 2. Restore everythere -> Can be read on Linux, Windows, Mac
> 3. Be reliable -> ECC is used on LTO-Tapes [1]
> 
> 
> IMHO LTFS is the ideal combination for using dar on tapes. You do not
> have to deal with dd / buffers / running out space. Just use the tape
> like an external drive.
> 
> Then I finished my test, I'll create a Repository on github, containing
> a Windows-CMD or Powershell-Script and an Linux-Bash-Script to backup
> and restore files on LTFS using dar.

Nice! :)

> 
> Beside of the gui, DAR is able to do all the stuff other tools in the
> LTFS-field do, e.g. YoYotta [2]:

there is some gui for dar, like gdar and darGUI... at least gdar is
maintained as I had to work with Tobias to validate latest major release
(2.7.0).

http://dar.linux.free.fr/doc/presentation.html#external_tools

> "During the archive YoYotta calculates both MD5 and xxHash checksums and
> then automatically uses these to read back and verify every file.
> YoYotta remembers the contents of every tape created so later on you can
> search to find the location of shots."
> 
> Is anyone interested in this, or already using LTFS and DAR?
> 
> Does anyone feel like testing the scripts or even just commenting?

well, I have no LTO to test it, as you all know ;)
> 
> [1] https://www.lto.org/2019/12/how-does-lto-tape-do-it/
> [2] https://yoyotta.com/yoyotta/ltfs.html
>