ElastiCache - Global Datastore

Global Datastore for Redis functionality enables you to work with fully managed cross-region replication quickly, reliably and securely. Each Global Datastore is a collection of one or more cluster that replicate data with each other. To use cross-region replication, you must have at least 2 clusters (Primary and Secondary, or Active and Passive, respectively) configured. The primary cluster is read/write, while the cluster secondary it’s just read and must be in another region.

For the Disaster Recovery strategy, if the primary cluster shows signs of degradation, a secondary cluster can be promoted to a primary cluster. The diagram below illustrates its operation:

Global Datastore

RTO: 1 minute

RPO: Generally less than 1 second

References: