Re: [opensuse] Timestamping [ Was : Converting file system]

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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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