2. Multi-JVM/Clustering-- The number of servers in the cluster = the numberof JVMs, unless you are using Z/OS. Sometime we use the term multi JVM for Clustering which is confusing.
3. Clustering is of two types.
a. Horizontal Clustering:-where we need seperate machines for each server/node in the clustering environment.
b. Verticle Clustering:- where in the same machine multiple servers/nodes are present, we don't need seperate machines. In websphere this can be done by having different profiles and in JBoss it can be achieved by making unique ports(RMIPort,RMIObjectPort,ServerBindPort,JBoss/Tomcat Http ports,ServerBindPort,WebService,Naming Port) in jboss-service.xml accross the cluster environment.
Note:- The advantage of Multiple JVM is applicable in both horizontal as well as Vertical clustering.
Note:- What is the meaning of 3 nodes 5 JVM? This is 3 machines in which 2 servers have 2 profiles each running in two seperate machine and 1 server with 1 profile running in the third machine, by this I have 5 servers running in 5 JVM and its 3 node 5 JVMs.
