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I am not able to know what is meant by Physical name,Logical name,Cluster etc. also we need to do failover in case a node changes.What is a node here in this architecture.Please help me out.
You are not helping us much - not saying what OS...
So let explain what can be, for any unix box:
The physical name is the host name, the one running the OS, but depending of the OS if you are a VPAR this is no more true...
If I describe what I know best: HP-UX, in a simple cluster (MX-serviceGuard soft) version with no VPAR, you would have for a cluster :
2 nodes -> 2 boxes (2 hosts...)
1 or more packages running on the cluster, these packages have "logical names" because the have their own IP and can be pingged...
A package has a default host on which it runs...
So if I summarize:
In a 2 node cluster my package runs on node1, if a failure should occur, it will be restarted on node2...
Of any help?