In my experience, there is a primary risk that drives project managers to consider overlapping iterations: the resource utilization risk.
If your goal for using Live Application Mobility is energy management and using it as a server consolidation tool, then resource utilization is not as important.
Before you leap to an OI plan, you should explore other resource utilization mitigation strategies as potential alternatives to OI.
Typically, resource utilization is a good indicator that a service-level breech might occur.
This impacts the resource utilization at the source systems negatively in that they need to respond to the sub-operations from the federation server.
However, a more frequent refresh cycle can have a negative impact on resource utilization.
