Active-passive.
also: active-passive failover · hot standby · warm standbyA redundancy pattern: the primary serves all traffic while a standby replicates its data and is promoted if the primary fails.
the two-minute refresher
- Primary (active) takes the traffic; the standby (passive) keeps a replica.
- On failure, promote the standby: that is failover.
- Simple, but the standby's capacity sits idle and failover takes time.
- Active-active instead serves from every node, at the cost of conflict handling.