On 9/16/10 7:27 PM, Daniel Sperka wrote:
>
> If, on the other hand,  I assume that rsync is doing file comparisons on both
> ends and transferring files as needed (i.e. those which are different than 
> those
> in the pool, or which are new), then the actual amount of data transferred is
> less than the full amount (the web interface says its just 92MB new files). If
> so, then the rates I measure using iperf are closer to what backuppc/rsync
> actually transferred (92MB/70 min = 0.02 MB/sec).
 >
>
> Is either of these cases correct, or is there another way to understand this?

It compares against the last full, transferring only the differences.

> Will the same be true for a machine that does NOT use checksum caching?

Checksum caching works on the server side, saving the work of reading and 
uncompressing the existing copy for the comparison. It shouldn't make a 
difference to what goes over the network.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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