Date: Thu, 18 Jan 2018 20:40:53 -0600 From: Adam Vande More <amvandemore@gmail.com> To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Splitting up sets of files for archiving (e.g. to tape, optical media) Message-ID: <CA%2BtpaK1riqaXp%2BJa=JoBHqEJe1%2BiM3simMs%2BqxW4=HHyORdSBQ@mail.gmail.com> In-Reply-To: <68377.1516327618@segfault.tristatelogic.com> References: <68377.1516327618@segfault.tristatelogic.com>
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On Thu, Jan 18, 2018 at 8:06 PM, Ronald F. Guilmette <rfg@tristatelogic.com> wrote: > > 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. > http://www.gnu.org/software/tar/manual/tar.html#Using-Multiple-Tapes -- Adam
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