Platform & DevOps·Running it: capacity, failure and recovery
both sites take live traffic all the time, so you already know the second one works when the first one dies.
Active-active
Also calledactive/active, dual live
Running two or more locations that all serve production traffic simultaneously. Its enormous advantage is that failover is a traffic-weighting change to a system you are already exercising, rather than an untested procedure. Its cost is that write conflicts and data consistency across sites become a permanent design problem rather than a disaster-only one.