Re: DeltaISOs

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On 8/29/2010 12:39 PM, Andre Robatino wrote:
> David <dgboles <at> gmail.com> writes:
> 
>>
>> Is it possible to make a deltaiso without having both the older ISO and
>> the Newer ISO on a local system.
>>
>> Example.  Fedora-14-Alpha-x86_64-Live.iso was downloaded. A
>> Fedora-14-Alpha-2-x86_64-Live.iso is availible for download.
>>
>> Can a deltaiso be made without downloading the newer ISO?
>>
>> makedeltaiso Fedora-14-Alpha-x86_64-Live.iso
>> http://path/to/folder/containing/Fedora-14-Alpha-2-x86_64-Live.iso deltaiso
> 
> Deltaisos won't save significant space when used on Live images. Having said
> that, if you were able to do the above (similar to what the rpm command can do),
> you would still be downloading the ISO, just not storing it on disk. Disk space
> is cheap, and as long as you have a few spare gig of space, you could just
> download the ISO, generate the diso, then keep the diso and delete the ISO to
> save on disk space. If you're using disos to save on disk space, you probably
> also want to verify that they reconstruct properly (which will require some
> temporary disk space, anyway) and to have multiple backups (since if you lose
> one, you can't reconstruct any of the ISOs after that).


I think that I understand the principal behind this. Disk space nor
bandwidth are not problems for me. I was thinking of others that might
have a bandwidth/byte counter problem.

Explain to me just how downloading only a part of the new ISO, the
changes, and then creating the new one with parts of the old ISO and the
new parts. How can that be the same as downloading the whole new ISO?

Or am I not understanding how this works.
-- 


  David
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