David Schwartz schrieb:
> On Apr 15, 11:25 pm, Peer-Joachim Koch <pk...@bgc-jena.mpg.de> wrote:
>
>> I'm currently trying to reduce our backup time. We have to transfer
>> ~250GB/day (50GB-2000GB).
>> We tried to connect one of the file server using bonding and 2 unused
>> network interfaces to improve the performance, but we are only seeing
>> a small improvement (5-10%; averg. is currently 60MB/s).
>
> Most bonding implementations assign a connection to a link, so a
> single connection will not run any faster.
So there is no way to benefit from a trunk for a single application ?
Only multi threaded or many individual app. can use the higher bandwith.

The main problem is our TSM backup. Therefore I'll have see how I can
set it up to use more individual threads or use lanfree ...

>
>> So I started to play a little bit on our cluster, where we have a couple
>> of nodes with bonding interfaces. Using netcat I can transfer a file
>> of 670MB within 5.9 sek, but this is only the theor. value for
>> 1 GBit.
>
> Yep, that's what I would expect.
>
>> Using scp I can only see ~45MB/s. (it's a 8 core node, so it's fast
>> enough ...).
>
> Since SCP is not multi-threaded, the transfer speed is limited by how
> fast one core can do encryption. Last I checked, there was a huge
> speed difference between various ciphers, so you might try a few to
> see which is fastest.
>
> DS

Thanks, Peer