At 44 hydrabase, which is a Facebook use of raft for multi region database says
Resilience to regional issues: More common than natural disasters are network disconnects, power issues, etc. For example, soon after we expanded our services to Oregon, one of the racks containing memcache and async tier servers was powered off, which caused large exceptions to user requests. With our new infrastructure in place, we were able to shift traffic away from the region to mitigate the issue while we recovered from the power failure.