SHA question

[ian]

On 15/01/2010 20:23, Roger Burton West wrote:
> On Fri, Jan 15, 2010 at 08:16:09PM +0000, Andy Wardley wrote:
>
>> My understanding[*] is that it computes a checksum for each block of a file
>> and only transmits blocks that have different checksums.
>
> And to calculate the checksum on each block of the file, it has to, um,
> read each block of the file... yes?
>
Doesn't rsync *push* rather than *pull* in which case the files it 
computes the checksum on are all local.

I did not think it worked in the way you mention without rsync daemon 
running at the remote end doing the checksum for you.