Platform & DevOps·Running it: capacity, failure and recovery
the second site sits there costing money and serving nothing, and the day you need it you find out which four things were never replicated.
Active-passive
Also calledactive/passive, standby site
Keeping a secondary location ready but idle, promoted only on failure. It is simpler than active-active because there is one writer, and its weakness is exactly that it is never exercised, so its readiness is a belief rather than an observation. Regular, scheduled failovers are the only thing that turns it from a slide into a capability.