Re: [tlug] Measuring Rsync bandwidth

[Neil Bortnak <nbortnak@example.com>]

Hi Patrick,

If you do a rsync with the --stats argument, you'll get a pile of
information at the end. IIRC the ones you want are "Total bytes written"
for outgoing network traffic, and "Total bytes read" for incoming. These
stats are repeated at the bottom in a slightly different format and
accompanied by the speed in bytes per second (wrote $outgoing bytes  
read $incoming bytes   $speed bytes/sec).

I've found that the minimum amount of traffic rsync needs to run is
directly proportional to the number of files you are syncing. Usually a
couple of megs for a large directory tree (a whole system and a couple
hundred thousand data files). No minimum speed, but 2TB over a 2400 baud
modem might cause other problems.

Neil


On Tue, 2003-10-28 at 16:07, patrick.niessen@example.com wrote:
> Dear All,
> 
> I am currently evaluating the possible setup of a hot standby server in
> another foreign branch of my company.
> 
> Because of this, I am asked by my HQ to provide detailed figures of the
> amount of data transferred on my network, so that they purchase enough
> capacity.
> 
> I use rsync to perform the backups so I would like to measure how much
> activity runs on the network because of this.  Do you have any idea how I
> can get some quick figures? Of course I can measure "du -h" before and
> after, but this would exclude the network overhead of rsync.
> 
> Also does anyone know if rsync requires a minimum speed / network latency to
> work?
> 
> regards
> 
> Patrick