Hello,
> I am thinking if it's possible to use a 2nd network card to implement a
> interconnection backplane between the clustered servers.
>
> Let me "ascii-art" this :
>
>
> ||
> Load Balancer
> ||
> --------SWITCH--------
> | | | |
> | | | |
> JB1 JB2 JB4 JB5
> | | | |
> --HUB-- --HUB--
>
>
> In this example JB{1,2} are a cluster, and JB{3,4} are a second cluster.
> The replication messages would be contained in the backplane between the
> elements of each cluster and would not overload the other cluster.
> The switch between the LoadBalancer and the JB instances would redirect
> the requests to the servers, not depending on the saturation of the
> backplanes.
>
> Well, with this I'm asking 2 questions:
>
> 1 - Can JBoss use a topology like this?
yes: in the JavaGroups properties, you can indicate which network interface
to use.
> 2 - Someone else thinks that this (topology) can be usefull/more
> efficient?
(Could you explain me your topology first? how you use it? That's
interesting. )
First, it depends on your switch. If it has enough processing power and a
good backplane, you don't need a second set of interfaces. In this case, you
must either configure your switch to not forward multicast (of a particular
port) from one side to the other => you need a switch working a the OSI
layer 4 (=> a router) or you need to change the JavaGroups properties to use
TCP instead of multicast. Only membership discovery paquets will then travel
from one side to the other => low traffic.
If you have a "slow switch" (or a very big inter-node communication), it
will certainly help to split the load yes.
Cheers,
Sacha
P.S.: could you please use the clustering online forums? So we have a
unified access for archives. Thank you.
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