Clustering Scenarios

[#1]

Dear All,

I know the concept of Active - Active, Active - Passive in clustering.

What is this Active - DR (disaster Recovery) ?

What are the log rules and policies of the above mentioned scenarios ?

In Active - Passive, does the license gets transfferred on runtime or it takes some time or we have to do manually ?

Please share some links or documents in detail.

Thanks in Advance

Regards,