Bill,

This is interesting about not using clustering.. Are you guys using CMP at all? If so, 
how do you suggest synching the entity beans without using clustering? On a site 
without CMP, you can usually get away from clustering, but wondering if you have used 
the equiv of Javelin to do distributed caching, deployed the CMPs a specific way, or 
just depend on pessimistic locking and the DB vendor. 

Thanks,
James

> -----Original Message-----
> From: Bill Burke [mailto:[EMAIL PROTECTED]] 
> Sent: Wednesday, October 16, 2002 1:47 PM
> To: [EMAIL PROTECTED]
> Subject: RE: [JBoss-dev] [JBoss-user] capacity planning to use jboss
> 
> 
> - You'll probably want to buy some Hardware based HTTP 
> load-balancer for your web traffic.  Make sure it supports 
> "sticky" sessions.  You can try Apache + modjk + AJP13 if you 
> want a cheap software solution.  Jetty and Tomcat can be hooked in.
> 
> - Do you require HTTP Session replication and failover?  If 
> its ok for a user to relogin after a failover, I suggest not 
> using JBoss clustering features at all, (Except for net boot 
> and maybe farming).
> 
> - On the performance tests I ran(ECPERF), replication had a 
> 10% hit on performance for 2 boxes running in a cluster.  
> You'll probably have more than 2 boxes(but not much more).
> 
> - I suggest marrying the WEB and EJB layer into one 
> JVM/process.  You'll get better performance.
> 
> - Next what you have to do is guess peak traffic.  Multiply 
> that number by 2 just to be safe.
> 
> - Next you'll need to write a stress test program
> 
> - Next you'll need to hire JBossGroup to help you out with 
> all of this. :)
> 
> - Next you'll need to purchase a high quality support 
> contract from JBossGroup to iron out any problems you may have :)
> 
> At Mercantec we had 2 dual 900mhz CPU running Linux and 
> JBoss, 1 dual 900Mgz PIII running Oracle.  We could support 
> traffic from 10K merchants.  But that's our application.  How 
> many users your app can support on a given piece of hardware 
> is totally dependent on the type of application you're running.
> 
> DON'T USE CLUSTERING UNLESS YOU HAVE TO!
> 
> Bill
> 
> 
> 
> 
> 
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of 
> > Emerson Cargnin - SICREDI Serviços
> > Sent: Wednesday, October 16, 2002 11:59 AM
> > To: [EMAIL PROTECTED]
> > Subject: [JBoss-dev] [JBoss-user] capacity planning to use jboss
> >
> >
> > Today i got a question from my manager (i work in a bank, 
> there will 
> > be a web layer at the bank office and a central ejb layer) :
> >
> > "Emerson, how many boxes in the ejblayer do we need to support 800 
> > offices and more than 4000 simultaneous clients (from the offices). 
> > Imagine that you have available any number of xeon dual 2mhz with 
> > 2giga RAM connected through a gigabit lan, how many boxes 
> of this kind 
> > do we need?"
> >
> > I confess that i exitated a little. This is a though 
> question, indeed. 
> > I think that CMP and mainly clustering will not have the same gain 
> > when you have too many nodes in the cluster, given the 
> communication 
> > needed among the nodes to keep the data replicated.
> >
> > Does any one have any parameter for a capacity plan for a scenario 
> > like this? jboss group, any clue ??
> >
> > What could be the limit beetwen number of nodes and replication 
> > overhead?
> >
> > Thanks in advance for any answer : )
> >
> >
> > --
> > xxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > | Emerson Cargnin          |
> > | Analista de Sistemas Sr. |
> > | Tel : (051) 3358-4959    |
> > | SICREDI Serviços         |
> > | Porto Alegre - Brasil    |
> > |xxxxxxxxxxxxxxxxxxxxxxxxxx|
> >
> >
> >
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