With the help of dynamically resized network socket buffer, vSphere 6 is capable to support vMotion of a VM across vCenter servers located far apart. Network round trip latency >100 ms (upto 150 ms) is tolerated/supported.
basic requirements to achieve long distance vMotion are as bellow
1) L2 Streched VM Network
2) Multi-site gateway support
3) Secure vMotion network between both the sites
Use cases of Long Distance vMotion
1) Multisite Load balancing
2) Permanent migration
3) Follow-the-sun-scenario support
4) Disaster Avoidance
References
VMware pushes the envelope with vSphere 6.0 vMotion
