Topology for production environment

this question is related to production environment deployment and clustering.
we have 1 physical server where we have webcenter domain. this domain has 1 admin server and 1 managed server (custom web center portal managed server).
our plan is to deploy our application on this managed server.
this is no clustered environment and not recommended (no failover, no load balancing).
what shall we do?
shall we create another managed server (custom web center portal managed server) and deploy our application on these 2 managed servers? there will be a load balancer in front to take care of transferring request to both the servers...
what's your suggestions?
please note that i know specific answer will depend on NFR (user load, performance etc) but i am looking for general guidance and reference around same like -
how many managed server recommended?
what kind of topology recommended for web center application?
etc
thanks.

jiri.machotka wrote:
I'd recommend you to start with this document: http://docs.oracle.com/cd/E11035_01/wls100/cluster/overview.html as a lot of this question is related to Weblogic clustering than WebCenter.
Note that whilst clustering has many pros, it has also few cons; among those:
- you might require additional hardware/software, or used components (like filesystem) will have to have features that you don't need in a non-clustered environment
- though small, scaling does consume some resources (I've heard that WebCenter Content takes 1-2% of Solaris, but up-to 25% on Windows Servers!)
- it's always at least a bit more expensive
Therefore, you should not go for a cluster, because it's cool, but because you have damn good reasons for that (that you didn't mention!), stemming from SLAs, or requirements for Disaster Recovery.
You write that you have just one physical server, so you already have one potential single point of failure.
I think I've heard that Weblogic Server itself is capable of self-recovery; this means, that a server may go down (you will lose all the current sessions), but is capable of auto-recovery. If your users survive that from time to time they will lose uncommitted work, then maybe a need for clustering (HA) won't be that strong (you might also go just for tuning your Weblogic Server).
On the other hand, where clustering might be necessary, if you need to scale, especially, if you need cloud-like increase/decrease of resources. I doubt it is possible to say up-front how many servers is recommended, but you may tune this later - whilst going from 1 node to 2 is relatively a big leap, going from 2 to 3, or 3 to 4 is then quite easy.
Either way, I'd recommend you to be in sync with your app server admin.thanks jiri. this was helpful.
while i agree that any architectural decision should be justifiable to requirements but as far as my experience goes clustering is basic thing in any production environment... in case 1 managed server goes down, other can still serve requests...
i'll read link provided by you and ask specific questions if any...
thanks.

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