Ensure that your ElastiCache Redis Cache clusters are using a Multi-AZ deployment configuration to enhance High Availability (HA) through automatic failover to a read replica in case of a primary cache node failure.
Enabling the Multi-AZ Automatic Failover feature for your Redis Cache clusters will improve the fault tolerance in case the read/write primary node becomes unreachable due to loss of network connectivity, loss of availability in the primary’s AZ, etc. Note: Redis Cache Multi-AZ with automatic failover does not support T1 and T2 cache node types or cache clusters with the Redis engine version earlier than 2.8.6.
Note: Redis Cache Multi-AZ with automatic failover is only available if the cluster has at least one read replica
To determine if your ElastiCache Redis Cache clusters are using a Multi-AZ configuration, perform the following:
To enable Multi-AZ Automatic Failover feature for your ElastiCache Redis Cache clusters, perform the following: