Which is the better fail over mechanisam

[dimitarn]

Thanks for the reply
Both servers will be serving requests and if one fails the other takes the load until the 1st get up.
I mean that if i use Option 1.A.2 then the sessions created on the LS 1 will not be replicated to LS 2 until LS 1 get down?

[Alessandro]

Option 1.A.2 implies using a Web Load Balancer. In that case, I confirm that the session migration from one server to another will typically happen only when the first server fails.