Re: [Xen-users] XCP, NFS for storage and bonded NICs

[Steve Thompson <smt@xxxxxxxxxxxx>]

On Mon, 1 Nov 2010, Bart Coninckx wrote:

> This is what I do as well, except by either not using a switch (direct links
> like for DRBD) or by using two seperate ones. If I understand correctly,
> balance-rr spoofs MAC addresses which will confuse the connected switch.
> Anyway, it goes nice speed results. I do have to tweak tcp_reordering though
> in my SLES machines. If I don't, I hardly get more speed than a single link.
Interesting. My balance-rr setup for DRBD uses two dedicated GbE links 
between two Intel cards on each of two Dell PE2900 servers, straight 
through with no switches, and using MTU=9000. I have had no problems with 
packet reordering at all (all tcp parameters are stock). I _do_ see some 
out of order packets, of course, but the counts are very small. An iperf 
test between the two systems gives 1.97 Gb/sec. I'm using CentOS 5.5 
x86_64.
In different applications, I use balance-rr with two links to a single 
Dell 48-port switch. No problems with that either, although it is less 
traffic.
Steve

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