Final answer:
Multi-AZ for ElastiCache for Redis is a feature that provides automatic failover by spreading data across different Availability Zones within AWS for high availability and fault tolerance
Step-by-step explanation:
Multi-AZ for ElastiCache for Redis is a feature that provides enhanced fault tolerance within the Amazon Web Services (AWS) ecosystem. ElastiCache for Redis is a fully managed in-memory data store, compatible with Redis, that delivers sub-millisecond response times. By enabling Multi-AZ, you can have a primary node and one or more read replicas spread across different Availability Zones within a region. This setup ensures high availability, as AWS will handle the failover to a read replica without intervention if the primary node goes down for any reason
Failover is automatic, which means that when a primary node fails, ElastiCache will promote a read replica to become the new primary node, ensuring minimal disruption and maintaining data access. This process is helpful in scenarios where reliable performance and continuity are crucial. Moreover, with automated backups and disaster recovery, Multi-AZ for ElastiCache for Redis provides a robust solution for managing Redis data sets with extra redundancy.