The farm service won't do this for you. You'd need to do it manually or via a script.

I think you can do that and you can still use farming. In the cluster-config.xml, you will need to change the partition name of Node1 and Node3 to same value. Make sure you don't specify partition name for Node3 (ie. let it use default partition). If you don't want to play with the config files, start JBoss with the partition (see the exact value in manual) name using -D option.
You'll also probably need to create a multicast address and use that address when you are trying to start the jboss server. Check out the arguements that you can use when you start Jboss.
Now Node1 and node3 are the part of partition, so farming will deploy/undeploy ears in that partition only.

Hope that helps

Hi Shoeb, thanks a lot for your mail.I am working in JBoss 4.2.1. I didn't find any file called cluster-config.xml and are you mentioning about the file with the name as "cluster-service.xml". If it is so please let me know ,where exactly i need to change in side that.

Thanks!
VVk

I have been tring to do what you explained here.

I am using JBoss 4.2.1 server.

As you explained , in jboss there is folder called
all\deploy\cluster-service.xml file. I changed the
attribute called

<attribute
name="PartitionName">${jboss.partition.name:DefaultPartition}</attribute>

<attribute
name="PartitionName">${jboss.partition.name:Node1}</attribute>

<attribute
name="PartitionName">${jboss.partition.name:Node1}</attribute>