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Re: quick CD burner Selector/Optimiser

by spartan (Pilgrim)
on Dec 19, 2003 at 20:52 UTC ( #315911=note: print w/replies, xml ) Need Help??


in reply to quick CD burner Selector/Optimiser

I really like this. I could have used it at the last 2 places I've been at. The only annoying thing is that it does not handle directories out of the range of the size of a CD.
I know it's easier to say "hey your thingy doesn't do this really neato thing" rather than stating the same, and then giving a solution. Alas I am far from providing solutions, but I though you'd like to know this is a nice little program.

UPDATE:
Oh for heavens sake... Had I taken the time to look a little more closely, I'd have seen that changing du -sk to du -dk gives a MUCH more granular look at the directory tree below where you invoke the script.
Good stuff!


Very funny Scotty... Now PLEASE beam down my PANTS!

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Re: Re: quick CD burner Selector/Optimiser
by dominix (Deacon) on Dec 22, 2003 at 04:12 UTC
    at least the script gives you the name of the directories you have to split ...
     du -dk what version is that ? did I got a so old distro ;-) that I haven't got this option ??

      my GNU du doen't have a -d option either, but on Solaris -d means 'Do not cross filesystem boundaries.' the equivalent GNU option is -x or --one-file-system.

      i've been toying with this backup thing for a couple of days, my new work provided home machine came with a DVD+RW drive that i want to put to some good use. but i have to admit i think it's much better/cheaper nowdays to get an extra HD for backups. mounting another 120G and using rsync beats the snot out of trying to fit things in 700M or 4.7G chunks.

      but i've still been looking at the problem from the angle of 'it is easier to send my sister a DVD than a HD' and i'm working on a little script to do just that.

      some tidbits from my digging...

      • DVD it appears has a 2k block size. assuming some sort of regularish filesystem on the media it might be wise to support block size in the calculations. a 1b file will take at least 2k on the disk.
      • i haven't found a way to calculate the iso9660 filesystem overhead except by running mkisofs with --print-size. if anybody knows the overhead calculations please share =).
      • iso9660 has a max-filesize limit, it's either 1 or 2 G, i forget which. so you won't be able to back up that 3G file on a DVD the obvious way.
      • mkisofs will automatically split those large files into filename_00, filename_01, filename_02, ... chunks. you'll have to put them back together yourself.
      • if you have RW media and multisession capability there is a neato patch for mkisofs that will do incremental backups. something like:
        mkisofs -r -J -root=backup_00 /path plus mkisofs -r -J -root=backup_01 -old-root=backup_00 /path
        if you burn the first iso, then the second as multisession when you mount the disk backup_01 will have the most recent files, plus hardlinks back to files that didn't change between backups. i haven't quite figured this out yet since DVD+RW multisession isn't working on Linux 2.6.0 yet (should be fixed soon).
      • it might be more appropriate to use the -H option over -h. -h is 1024*1024 wise, -H is 1000*1000 wise. the 4.7G DVD is in -H units, not sure about 700M CD but i would guess it's in -H units also.

      if anybody knows of any interesting and not too difficult algorithms for packing i would love to know about them. seems Algorithm::Bucketizer only has a couple that are either simple or random. i'd like to find something with a bit of heuristics added.

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