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The Friday 2007-04-27 at 12:50 +0100, G.T.Smith wrote:
> > > became apparent that one would still have move the dar slices to an iso
> > > image and the iso image would then need to be burned.
> >
> > Obviously. But I understand it can burn them in parallel to the backup
> > procedure continuing.
> Not strictly parallel, it allows for a script to be executed after a
> slice has being written (or before) and one could therefore background
> a burn process... but if one is writing in a scenario where the media
> size < backup size you will get no benefit or if no of slices > 1 per
> media and no of media > 1 some interesting juggling will need to be
> performed by the script to identify what needed to be written.
I haven't really tried it yet, it is on my to do list. I do my backups to
other HD and manually to DVD. Not an automated solution.
> > > A further
> > > complication is although kdar apparently offers a 4Gb slice size for DVD
> > > the dvdtools burning tools will only accept a max of 2Gb per file
> > > (slice).
> >
> > Yes. I haven't looked at it for use with dar, but you know that you are
> > not limited to iso images for dvd burning: I myself use XFS, wich doesn't
> > have that limitation. I wonder I f I could use them from dar.
> This 2Gb file size limit seems to be a linux thing with DVDs not sure
> whether this is just t wodim or what.
I believe it is a limitation of the iso format. As I mentioned, I burn
DVDs in XFS format and I have no such limitation.
> > > (And not even that... setting slice size to 2Gb still caused
> > > problems).
> >
> > At 2 GB, 400 MB are wasted. Better four slices of 1.1 GB.
> Still 400k wasted with 4Gb according to kDar (DVD slice is set as 4.3Gb)
4 * 1.1 = 4.4, no waste.
> > I still have to evaluate dar, but I should think it makes an index to
> > facilitate this. Any good backup solution should handle this.
> External index an option, but then one has to transfer the index to DVD
> to make it available. (loops within loops) And it does not deal with
> issue of which part of the media set a particular file is on.
I don't know how dar/kdar deal with it, but it should be done
automatically. Ie, choose a file, and the program should ask for the exact
dvd(s) to be mounted. The user should not be bothered with details.
> >
> > I miss pctools backup from 198X-190X, for MsDos... it could backup to
> > floppies files way larger than a single floppy, and restore without
> > problems - even with media errors. My backups from that era still work.
> >
> But beware the dodgy floppy ;-)
I do have some floppies with errors. One bad error on a set of 80
floppies, data still recoverable with error correction techniques
automatically applied by the program. I say I miss that software for a
reason...
But present day floppies are very bad quality. When I use one of those I
save in duplicate or triplicate. Very unreliable nowdays.
- --
Cheers,
Carlos E. R.
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