but at all, mind the gap!
... if you are the generating pk with your ejb's for example in a
PrimaryKeyGenerator and not database based like through triggers or
'autoincrement' and the clustering fails on one interface, but all nodes
are still alive ...
bax
----- Original Message -----
From: "Sacha Labourey" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, July 30, 2002 8:38 AM
Subject: RE: [JBoss-user] Clustering: Possible to use a "backplane" to
connect the servers??
> 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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