clustering

what is clustering ?
clustering is the group of managed servers in the machine.
advantages of clustering?
load balancing
distribution of requests to the managed servers.
mainly there are two algorithems we are following. They are Round Robin Algorithem ,weight based algorithem. in our organisation we are using round robin algorithem.we are not using weight based but i am aware of weight based algorithem.
fail over when a managed server failed while working then the request will be served through next available server.From failed managed server the request serve resume through session object to next available server and completes the requests.
high availabilty:the managed server available 24/7.for that deployment is done in all the managed servers.
scalabilty:we can add more managed servers to the cluster when requires to the client.

what is round robin algoruthem ?
if there are 3 servers in a cluster.so here 1 st request will go to the first server and second one goes to  seconf server and third one goes to the third server and 4th request goes to the 1st server and in this way is serves the requests.
what is the weight based algorithem ?
request will be served as per the deployment ordrer.
what are the machines in the web logic server?
single machine is assigned to single virtual machine.
another machine is known as another virtual machine.
* machine1 is known vm 1.
* machine 2 is known as vm 2.



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