i am confused about what exactly you want?
you already have a miror site which is loadbalanced and want to modify the loadbalancer?
or are you just looking for a failover??
loadbalancing always blances the load between all available servers.
failover switchs the mainserver-url to the mirrorserver-IP only if main server is down, and while mainserver is up all traffic of the mainserver-url goes to mainserver-IP. (for this no loadbalancer is needed)
Well I want to know both the ways and their pros and cons.
Can you please help me in knowing how load balancing as well as failover (for mirroring) works.
I know the basic idea of load balancing but I do not know how do I set it up?? how many server will I require, how will I manage them, wat cost does it have?? Will my sites run on different IPs?? etc. etc