Splitting up sets of files for archiving (e.g. to tape, optical media)

Adam Vande More amvandemore at gmail.com
Fri Jan 19 02:40:55 UTC 2018

On Thu, Jan 18, 2018 at 8:06 PM, Ronald F. Guilmette <rfg at tristatelogic.com>

> This isn't really FreeBSD specific, but in my experience the folks on
> this list have a lot of knowledge about a lot nice, useful free software
> tools, so I hope nobody will begrudgd me for asking this question here.
> I'm looking for a pre-existing software tool, which may or may not already
> exist, and which will do the following job...
> Problem statement:
> Imagine that you have a big set of files that you would like to archive
> to some sort of archiving media, such as tapes, or optical media, where
> each unit of said archiving media has a capacity considerably less than
> the total aggregate size of all of the files you want to archive.
> Imagine further that you would like your set of input files to be spread
> across the units of the output (archive) media such that no single input
> file is ever split across more than one unit of the output media, in order
> to simplify recovery/restore of individual files.
> Lastly, assume that it is desired to minimize, as much as reasonably
> possible, the total number of output (archive) media units used to
> archive the entire set of input files.  (And to further this goal,
> it is acceptable for files from any single input subdirectory to be
> scattered among the various output media units.
> +_+_+_+_+_+_+_+_+_+_
> In my case, I want to archive several hundred gigabytes onto a set of
> blank BD-R disks.
> I plan to use ImgBurn to actually write the BD-R disks.
> So basically, I just need a tool to analyze the input file set, applying
> some sort of bin packing algorithm, and then spit out a list of which
> specific files should go into each specific archive volume, e.g. #01, #02,
> #03... etc.  Each such set of files will then, in turn, be hard-linked
> into a temporary directory, and then, one by one, ImghBurn will be told
> to write each of these temp directories to a single output BD-R disk.
> I have written a small software tool to do the above "splitting" job,
> and I am currently improving upon it, but it occured to me that I
> should at least ask if someone else has perhaps already perfected this
> exact wheel that I am busy re-inventing.
> Regards,
> rfg
> P.S.  It seems unlikely that I'm the first and only person to have ever
> written a tool to do this specific job, but on the off chance that I am,
> I am more than willing to contribute my little tool to the ever-expanding
> ports tree.



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