Re: [Sheflug] Scripting backups to cdrom.

["Rob Keeling" <rob [at] xxxxxxxxxxxxxxxxxxxxxxxxx>]

Alex,

>From: "Alex Hudson" <home [at] alexhudson.com>
>To: <shef-lug [at] list.sheflug.org.uk>
>Sent: Wednesday, June 18, 2003 2:32 PM
>Subject: Re: [Sheflug] Scripting backups to cdrom.

>> On Wed, Jun 18, 2003 at 02:16:57PM +0100, Rob Keeling wrote:
> > I need to add the files in alpabetical order, not splitting home dirs
across
> > cd roms.
>
> Are you saying here any given home would be <700Mb in size?

Yes, they vary from a few Mb up to max 200Mb

>
> > I can see how to use cdrecord and mkiso to create the cd images from a
dir
> > of the right size, what I can`t see is a way to
> > script dividing the home dir`s between runs to make the cd`s max 700Mb.
> >
> > Can anyone give suggestions?
>
> Yup. First, you need a script that will generate ISOs from file lists.
> You probably want it to generate multiple ISOs, so it should take input
like
>
> CDROM1
> /file1
> /file2
> CDROM2
> /file3
> /file4
> /file5
>
> ...etc..
>
> ... and make those into cdrom1.iso, cdrom2.iso, etc.
>
> Then, you need a second script to run in front of the first that groups
your
> HOMEs into groups of <700Mb, which shouldn't be too hard (depending on
> whether homes might be <700Mb - if you _can_ guarantee that, it's very
> simple to make it work).
>

Ah, I can follow your logic, but I have no idea how to write said scripts.

> You probably need to be aware that the general case of this - i.e., using
as
> few CDROMs as possible - is probably the packing problem, and therefore
> NP-hard (i.e., difficult to compute). I think.

Yes, I have given up on any thought of efficent use of cdrom`s as the extra
computational time involved
in juddling the files, and then finding them again outwayed the cost of the
additional CDROM`s.

>
> Cheers,
>
> Alex.

Thanks

Rob Keeling


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