[Nottingham] Just how smart is rsync?

[Eben Till]

You got any papers or anything on this? Sounds pretty interesting, I never
knew rysnc would be able to do it with a binary.
Learn something everyday

On Thu, May 26, 2011 at 4:59 PM, Richard Dewhurst <
dewhurst+lug_nottingham at gmail.com> wrote:

> Or take the more sensible option of extracting the zip files on both ends
> and running rsync on the uncompressed images.
>
> Rsync is perfectly capable of transferring only the changed portions of a
> large file, it's just that compressed files tend to change completely when
> the files inside change, unless created with something like gzip's
> --rsyncable.
>
> It also has --compress/--compress-level if you want to compress the
> transfer itself.
>
>
>
> Martin wrote:
>
>> On 26 May 2011 16:21, Jason Irwin <jasonirwin73 at gmail.com> wrote:
>>
>>> Is it one huge compressed image or is it rather small bits that
>>>> contribute?
>>>>
>>>
>> If the VMimage is compressed as one block, then rsync will see it as
>> one file and will transfer it as one file.
>>
>> If you can mount the image remotely, and mount your image locally,
>> then rsync will only transfer the files and directories that are
>> different between the two. Just to be sure, I'd use the "-c" option
>> for checksumming but with 11 GBytes, you'll need fast machines for
>> that to be practical in just 24 hours!
>>
>> How fast is your connection?
>>
>> Perhaps your only chance is to mount the contents of the images and
>> rsync the difference of the contents of the images.
>>
>>
>> Or...
>>
>> Jump on an airplane with a memory stick?
>>
>> Good luck,
>> Martin
>>
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>
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