Re: [Xen-users] quick question about bonding with vlans and Xen

[Donny Brooks <dbrooks@xxxxxxxxxxxxxxxx>]

On 6/21/2010 7:37 PM, Fajar A. Nugraha wrote:
> On Tue, Jun 22, 2010 at 3:17 AM, Donny Brooks<dbrooks@xxxxxxxxxxxxxxxx>  wrote:
>    
> > But I would like to at least take advantage of the vlan support so I
> > can at least test that. Shouldn't I be able to do the following to enable
> > vlan support?:
> >
> > remove bond0 interface
> > setup eth1 as vlan master
> > change any reference to bond0 in the bond0.XX and brXX files to eth1
> > restart networking
> > and hopefully it just work?
> >      
> You still need the bridge. So you can dump bond0, change all bond0.XX
> to eth1.XX, but you still need brXX.
>
>    
Ok, after a little clearing my head and thinking about it I found the 
"simple thing I was missing"... I had to change the MTU setting on my 
servers network cards to allow the vlan header to be passed. I was 
unable to even get the eth2.X interfaces to work so I knew it had to be 
something else. I changed the MTU and it started working on the eth2.X 
devices (with the brXX stuff of course). After changing the MTU to 1496 
on eth1 - eth3 I then commenced testing the various bond modes again. 
Here are the results:
mode=0 No go
mode=1 Works
mode=2 No go
mode=3 Didn't test
mode=4 Works
mode=5 Didn't test
mode=6 No go


I tested by doing a clean reboot after changing modes. Any idea why some 
did and some didn't? All I changed between modes was the mode=X in the 
modules.conf file. And of course the switch information for mode 4.
So I was able to finally settle on mode 4 since it is the only one that 
works and provides fault tolerance and load balancing. I just knew it 
was a simple thing I was missing. Thanks to all that have helped me 
through this. I have backed up all my configs incase anyone else wants 
to try this.
One question though: should mode4 allow an increase in overall 
throughput if I am able to setup another host with bonded interfaces? I 
am mainly looking at my backuppc installation as well as eventually 
doing live failover of domu's.
Donny B.


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