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

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.


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